MCQ Questions for Class 11 Medical Chemistry States Of Matter Gases And Liquids Quiz 1

Which of the following gas mixture is not applicable for Dalton's law of particle pressure?

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$SO_2$ and $Cl_2$
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$CO_2$ and $N_2$
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$CO$ and $CO_2$
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$CO$ and $N_2$

The value of gas constant per mole is approximately-

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$1\ cal$
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$2\ cal$
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$3\ cal$
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$4\ cal$

A constant gas temperature is based on

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Archimedes prinviple
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Pascal laW
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Boyle's law
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Charles's law

Gay Lussac law gives relation between:

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$P\,$ and $\,V$
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$P\,$ and $\,T$
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$V\,$ and $\,T$
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none of these

The three phases of water (Solid, Liquid, Gas) are:

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ice, water, steam
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water, ice, steam
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steam, ice, water
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steam, water, ice

Identify which of the following statements is FALSE?

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The vapor pressure of a liquid decreases with increasing atmospheric pressure.
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The value of an equilibrium constant is dependent on temperature.
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The rate of a spontaneous reaction cannot be determined solely by its Gibbs free energy.
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During a phase transition, the temperature of a substance must be constant.
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The addition of a catalyst to a reaction at equilibrium has no net effect on the system.

$\Delta_f G^{\circ}$ at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcal

$mol^{-1}$ respectively. Vapour pressure of liquid 'S'' at 500 K is approximately equal to:

$R = 2 cal K^{-1} mol^{-1}$

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10 atm
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0.1 atm
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1 atm
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100 atm

All kind of matter is made up of extremely small particles called ___________.

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atom
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molecule
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ion
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compound

Which term describes the mass of

$6.022\times { 10 }^{ 23 }$ representative particles?

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Molar mass
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Avogadro's number
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Empirical formula
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Molecular formula

Explanation

Molar mass of a compound describes the total mass of

$6.023 \times 10^{23}$ atoms or particles of the compound.

Ex: Molar mass of

$H_2 = 2\space g$

Total pressure of a gaseous mix is equal to the sum of the Partial Pressures is:

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Boyle's law
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Charles's law
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Avogadro's principle
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Dalton's law

Which is wrong according to kinetic theory?

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The average kinetic energy of the molecules is directly proportional to the absolute temperature.
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All the molecules in a gas have the same kinetic energy.
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Collisions between molecules are perfectly elastic.
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Pressure is due to the impact of the molecules on the walls of the container.

Explanation

K.E. =

$\cfrac {1}{2} mv^2$ and from Maxwell distribution curve it can be seen that molecules of all the gases have a wide range of speed so they have different kinetic energy.

Hence option B is correct.

Which of the following is not an assumption of the kinetic theory of gases?

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Collision of gas particles are perfectly elastic.
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Gas particles have negligible volume.
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At high pressure, gas particles are difficult to compress.
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A gas consists of many identical particles which are in continual motion.

Liquid

$M$ and liquid

$N$ form an ideal solution. The vapour pressures of pure liquids

$M$ and

$N$ are

$450$ and

$700\ mm$

$Hg$ , respectively, at the same temperature. Then correct statement is:
(

${x}_{M}=$ Mole fraction of

$M$ in solution;

${x}_{N}=$ Mole fraction of

$N$ in solution;

${y}_{M}=$ Mole fraction of

$M$ in vapour phase;

${y}_{N}=$ Mole fraction of

$N$ in vapour phase)

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$({x}_{M}-{y}_{M})< ({x}_{N}-{y}_{N})$
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$\cfrac{{x}_{M}}{{x}_{N}}< \cfrac{{y}_{M}}{{y}_{N}}$
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$\cfrac{{x}_{M}}{{x}_{N}}> \cfrac{{y}_{M}}{{y}_{N}}$
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$\cfrac{{x}_{M}}{{x}_{N}}= \cfrac{{y}_{M}}{{y}_{N}}$

Explanation

Since

$P^o_N>P^o_M,$ so

$N$ is more volatile than

$M.$

$\therefore y_N>x_N$

and

$x_M>y_M$

Multiply we get

$y_N\times x_M>x_N \times y_M$

$i.e.\ \dfrac{x_M}{x_N}=\dfrac{y_M}{y_N}$

According to kinetic theory of gases :

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collisions are always elastic
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heavier molecules transfer more momentum to the wall of the container
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only a small number of molecules have very high velocity
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between collisions, the molecules move in straight lines with constant velocities

The correction factor

$'a'$ to the ideal gas equation corresponds to:

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electric field present between the gas molecules
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density of the gas molecules
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forces of attraction between the gas molecules
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volume of the gas molecules

Explanation

The correction factor

$'a'$ to the ideal gas equation corresponds to forces of attraction between the gas molecules. Greater the value of

$'a'$ , more easily a gas can be liquefied. The unit of

$'a'$ is

$atm L^{2}mol^{-2}$ .

Gay Lussac's law of gaseous volume is derived from :

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law of definite proportions
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law of multiple proportions
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law of reciprocal proportions
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experimental observation

At same temperature and pressure, equal volumes of gases contain the same number of:

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molecules
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electrons
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protons
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particles

Matter is made up of ____________.

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wood
0%
blocks
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particles
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None of the above

Pen, book, needle belong to which states of matter?

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Solid
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Liquid
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Gas
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Plasma

At constant volume, pressure is directly proportional to the temperature, this law is popularly known as :

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Charle's law
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Boyle's law
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Gay Lussac law
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Avogadro law

Explanation

According to Gay Lussac's law, pressure is directly proportional to temperature at constant volume.

$P\propto T$

State True or False.

The standard molar volume of an ideal gas is 22.4 L.

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True
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False

According to the Avogadro's Law, equal volumes of two different gases, under same conditions of temperature and pressure, contain equal number of:

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atoms
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molecules
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electrons
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protons

Equal volume of gases contain equal number of moles.

State whether the above statement is true or false.

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The statement is True
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The statement is False
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Neither
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Equal volume of gases contain equal number of moles, only when the temperature is increased

The velocity of sound in a gas is

$30 {ms}^{-1}$ at

$27^o C$ . What is the velocity of the sound in the same gas at

$127^o C$ ?

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$20 {ms}^{-1}$
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$30 {ms}^{-1}$
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$20\sqrt{3} {ms}^{-1}$
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$60 {ms}^{-1}$

Explanation

$T_1 = 27+273 = 300K$

$T_2 = 127+273= 400K$

We know velocity of sound is directly proportional to

$\sqrt{T}$

So,

$\dfrac{V_2}{30} = \dfrac{400}{300}$

$V_2 = 20\sqrt{3}ms^{-1}$

Which tool allows liquids to be swirled with a low risk of spilling?

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Evaporating dish
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Tonds
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Crucible
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Erlenmeyer flask
0%
Mortar and pestle

Explanation

Erlenmeyer flask

$\rightarrow$

It is used as a container for liquids. Its Shape makes it easy and safe to swirl liquids without spilling, making them ideal for titration. It cannot be used to measure the volume of liquid because its shape makes it difficult to make accurate readings.

Hence the required answer is (C) Erlenmeyer flask.

The kinetic energy of a molecule of a gas is directly proportional to the absolute temperature of the gas.

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True
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False

Which statement is linked with the idea that two identical containers filled with different gases will contain the same number of particles?

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Mosely
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Avagadro
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Dalton
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Mendeleev

Which gas law should be used to solve a gas problem in which only the pressure and temperature of a gas change?

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Boyle's Law
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Ideal Gas Law
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Combined Gas Law
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Gay-Lussac's Law

All gases have the same number of moles in the same volume at constant temperature and pressure.

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Boyle's Law
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Charles's Law
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Avogadro's Principle
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Ideal Gas Law

The graph pressure versus temperature

$(T)$ at constant volume is a straight line.

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True
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False

Which of the following is a characteristic of matter?

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Particles are very small in size.
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Particles have space among them.
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Particles posses kinetic energy.
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All of above.

Most elements are solids at 25

$^o$ C and 1 atm pressure, the exception being the 11 elements that are gases and 2 that are liquids. What 2 elements are liquids?

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Hg and Br
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Hg and I
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Ag and Kr
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Au and Kr
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Pt and Co

Explanation

At room temperature, that is

$25^o C$ and

$1$ atm, Mercury and Bromine both exist as liquids. Hence option A gives the correct pair.

Iodine, Silver, Platinum, Cobalt are all solid at room temperature. Whereas, Krypton is a gas at room temperature.

Which of the following statements is the most accurate with regard to the significance of Avogadro's number,

$6.02 \times 10^{23}$ ?

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It is the conversion factor between grams and atomic mass units.
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It is a universal physical constant just as the speed of light.
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It is the number of particles that is required to fill a $1\ L$ container.
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It is the inverse diameter of an $H$ atom .

Explanation

A carbon atom weighs 12 AMU, one AMU is equivalent to

$1.66 \times 10^{-24}$ grams. Conversely, one gram is equivalent to

$6.022 \times 10^{23}$ AMU, which is called Avogadro's number

so the answer is A

Which of the following solution in water will have the lowest vapour pressure?

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$0.1 M, NaCI$
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$0.1 M, Sucrose$
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$0.1 M,{ BaCI }_{ 2 }$
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$0.1 M { Na }_{ 3 }{ PO }_{ 4 }$

Explanation

$Na_3PO_4$ will give maximum ions in water (

$4$ ions)

So, it has lowest vapour pressure.

${ \left( \cfrac { \partial H }{ \partial P } \right) }_{ T }$ for an ideal gas is equal to:

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zero
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$\cfrac { \Delta VRT }{ P }$
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$\cfrac { P\Delta V }{ T }$
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$nR\Delta T$

Which of the following would have the lowest vapor pressure in the pure state?

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Sodium hydroxide because of the strong interparticle forces of ionic solids
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Methanol because of the hydrogen bonding in the functional group along with the non-polar nature of the carbon hydrogen bonds
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Water because of the very strong hydrogen bonding in the substances
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Ammonia because of the unbonded pair of electrons on the central atom coupled with hydrogen bonding in the substance.

In a given mixture of non-reacting gases, the ratio of partial pressure of each gas is equal to its:

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weight percent
0%
volume percent
0%
mole fraction
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critical pressure

When two molecules of an ideal gas collide:

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heat is liberated
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no heat is liberated
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heat is absorbed
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there is a decrease in the total K.E

According to kinetic theory of gases, there are:

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intermolecular attractions
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molecules have considerable volumes
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no intermolecular attractions
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velocity of molecules decreases for each collision

The pressure at which liquid and vapour can coexist at equilibrium is called the :

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limiting vapour pressure
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real vapour pressure
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normal vapour pressure
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saturated vapour pressure

Dalton's law of partial pressure is not applicable to which of the following mixture of gases?

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$H_{2}+F_{2}$
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$NH_{3}+HCl$
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$SO_{2}+Cl_{2}$
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$H_{2}+O_{2}$

Explanation

According to Dalton's law of partial pressures, for a mixture of non-reacting gases, the total pressure is equal to the sum of the partial pressures of the individual gases.

This law is not applicable to the mixtures

$H_{2}+F_{2}, NH_{3}+HCl$ and

$SO_{2}+Cl_{2}$ and

$H_{2}+O_{2}$ as they react with each other.

For example, hydrogen and fluorine react to form hydrogen fluoride.

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Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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Assertion is correct but Reason is incorrect
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Assertion is incorrect but Reason is correct

Explanation

The volume ratio of

$H_{2} ,Cl_{2}$ and

$HCl$ in the reaction

$H_{2}+Cl_{2}\rightarrow 2HCl$ is

$1 : 1 : 2$ .

This is an example of Gay Lussac's law of combining volumes of gases which states that, "when gases react together to produce gaseous products, the volumes of reactants and products bear a simple whole-number ratio with each other, provided volumes are measured at same temperature and pressure ".

Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Hence, the correct answer is option

$\text{A}$ .

When an ideal gas undergoes expansion through a porous plug, the gas is expected to exhibit no cooling because ___________.

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there exist no molecular forces of attraction
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the molecules collide with each other, without any loss of energy
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the volume occupied by molecules is negligible in comparision to the volume of the gas
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none of the above

Which is wrong according to kinetic theory of gases?

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Average $KE$ of molecules is proportional to the absolute temperature
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Collisions between molecules are perfectly elastic
0%
Pressure is due to collisions between molecules
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There are no attractive forces between the molecules of gas

For which of the following mixture of gases, Dalton's law of partial pressure is not applicable at room temperature?

0%
$HCl+NH_{3}$
0%
$CO+CO_{2}$
0%
$O_{2}+N_{2}$
0%
$SO_2+O_{2}$

Explanation

Dalton's law of partial pressure is not applicable at room temperature for a mixture of reacting gases.

Thus, Dalton's law of partial pressure is not applicable at room temperature for a mixture of (A) hydrogen chloride and ammonia.

Hence, the correct answer is option

$\text{A}$ .

The total pressure of a mixture of two gases is:

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the sum of the partial pressure
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the difference between the partial pressure
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the product of the partial pressure
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the ratio of the partial pressure

The velocity of a gas molecule present in a cubic vessel in

$x-$ direction is 1000

$cm/sec$ . The side of that cubic vessel is 10

$cm$ . The number of bombardments made by the molecule on one face in

$x-$ direction in one second is:

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$200$
0%
$400$
0%
$25$
0%
$50$

Which of the following is not a surface phenomenon?

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Surface tension
0%
Viscosity
0%
Evaporation
0%
Capillarity

$V$ versus

$T$ curves at constant pressure

$P_{1}$ and

$P_{2}$ for an ideal gas are shown in the figure given above. Choose the correct relation.

0%
$P_{1} > P_{2}$
0%
$P_{1} < P_{2}$
0%
$P_{1} = P_{2}$
0%
Cannot be related

Explanation

According to Charles's law, when the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be directly related.

This directly proportional relationship can be written as:

$V \propto T$ &

$P \propto T$

For the above case, let us consider at a point volume is constant. We find that the temperature of the gas at pressure

$P_2$ is greater than that of gas at pressure

$P_1$ .

$\therefore$

$P_1 < P_2$

Hence, Option "B" is the correct answer.

Value of gas constant

$R$ is:

0%
$0.082$ $L\:atm$
0%
$0.987$ $cal\:mol$ $^{-1}$ $K$ $^{-1}$
0%
$8.3$ $J \:mol$ $^{-1}$ $K$ $^{-1}$
0%
$83$ $erg \:mol$ $^{-1}$ $K$ $^{-1}$

Explanation

Value of gas constant

$R$ is

$8.3145$

$J \:mol$

$^{-1}$

$K$

$^{-1}$ .

which is correct value with correct unit.

Option C is correct.

CBSE Questions for Class 11 Medical Chemistry States Of Matter Gases And Liquids Quiz 1 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

CBSE Questions for Class 11 Medical Chemistry States Of Matter Gases And Liquids Quiz 1 - MCQExams.com

0:0:1

Practice Class 11 Medical Chemistry Quiz Questions and Answers

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