CBSE Questions for Class 11 Medical Chemistry Hydrogen Quiz 6 - MCQExams.com

Potassium on reacting with cold water catches fire and burns in a flame. Guess the colour of the flame.
  • Golden yellow
  • Lilac
  • Brick red
  • Blue
Hydrogen readily combines with which of these elements?
  • Na
  • K
  • Ca
  • Zn
Complete the following equation$$:$$
$$Cl_2+H_2O\rightarrow$$
  • $$HCl+HClO$$
  • $$HCl+O_2$$
  • $$HClO+O_2$$
  • None of the above
________ does not expand on melting and does not contract on freezing.
  • Alcohol
  • Helium
  • Water
  • Oxygen
Which of the following metal reacts with steam to liberate hydrogen?
  • Magnesium
  • Aluminium
  • Zinc
  • All of the above
Aluminium carbide reacts with water to give __________.
  • Ethane gas
  • Methane gas
  • Acetylene gas
  • Ethyne gas
Which of the following reaction is correct when water reacts with metal?
  • $$2K+2H_2O\rightarrow 2KOH+H_2\uparrow$$
  • $$2Na+2H_2O\rightarrow 2NaOH+H_2\uparrow$$
  • $$Ca+2H_2O\rightarrow Ca(OH)_2+H_2\uparrow$$
  • All of the above
It is difficult to cook rice in an open vessel by boiling it at high altitudes because of:
  • low boiling point and high pressure
  • high boiling point and low pressure
  • low boiling point and low pressure
  • high boiling point and high pressure
Oxygen is collected by downward displacement of water since it weighs  __________ as/than air.
  • heavier
  • lighter
  • same
  • none of the above
Steam reacts with red hot iron to produce?
  • Ferric oxide and hydrogen
  • Ferric oxide and hydrogen gas
  • Ferrous oxide and hydrogen
  • Ferrous oxide and hydrogen gas
Which of the following is not correct regrading the electrolytic preparation of $$H_2O_2$$?
  • Lead is used as cathode
  • $$50\%$$ $$H_2SO_4$$ is used
  • Hydrogen is liberated at anode
  • Sulphuric acid undergoes oxidation.
Statement 1: Water is a polar substance.
Statement 2: The sharing of the bonding electrons in water is unequal.

  • Both statement 1 and statement 2 are correct and statement 2 is the correct explanation of statement 1

  • Both statement 1 and statement 2 are correct and statement 2 is not the correct explanation of statement 1

  • Statement 1 is correct but statement 2 is not correct

  • Statement 1 is not correct but statement 2 is correct

  • Both the statement 1 and statement 2 are not correct

Which type of bonding is responsible for the relatively high boiling point of water?
  • Hydrogen bonding
  • Ionic bonding
  • Network bonding
  • London dispersion force
  • Metallic bonding
Which of the following compound has an O-O bond?
  • $$\displaystyle { CO }_{ 2 }$$
  • $$\displaystyle { NO }_{ 2 }$$
  • $$\displaystyle { SO }_{ 2 }$$
  • $$\displaystyle { H }_{ 2 }{ O }_{ 2 }$$
  • $$\displaystyle { TiO }_{ 2 }$$
Which of these describe the molecular structure of water?
Which of the following properties can be assigned to water?
I. It has a permanent dipole moment attributed to its molecular structure.
II. It is a very good conductor of electricity.
III. It has its polar covalent bonds with hydrogen on opposite sides of the oxygen atom, so that the molecule is linear.
  • I only
  • III only
  • I and II only
  • II and III only
  • I, II and III
Statement 1: The water molecule is polar.
Statement 2: The radius of an oxygen atom is greater than that of a hydrogen atom.

  • Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  • Both Statement 1 and Statement 2 are correct and Statement 2 is not  the correct explanation of Statement 1.

  • Statement 1 is correct but Statement 2 is not correct.

  • Statement 1 is not correct but Statement 2 is  correct.

  • Both the Statement 1 and Statement 2 are not correct.

Statement 1 : The reaction of hydrogen with oxygen to form water is an exothermic reaction.
Statement 2: Water molecules have polar covalent bonds.

  • Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  • Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  • Statement 1 is correct but Statement 2 is not correct.

  • Statement 1 is not correct but Statement 2 is  correct.

  • Both the Statement 1 and Statement 2 are not correct.

Bentonite, a clay of alumina-silica, is dropped from aeroplanes in the form of a slurry with water for the purpose of:
  • cooling the soil
  • fertilizing the soil
  • fumigation of plants
  • spreading water over fires
Which of the following is useful in explaining the polarity of water?
I. The solution process.
II. The ionization process.
III. The high conductivity of distilled water
  • I only
  • II only
  • I and II only
  • II and III only
  • I, II and III
Statement 1: Water is a good solvent for ionic and/or polar covalent substance.
Statement 2 :  Water shows hydrogen bonding between oxygen atoms.

  • Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  • Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  • Statement 1 is correct but Statement 2 is not correct.

  • Statement 1 is  not correct but Statement 2 is  correct.

  • Both the Statement 1 and Statement 2 are not correct.

What is chiefly responsible for the relatively high boiling point of water?
  • Hydrogen bonding
  • Ionic bonding
  • Network bonding
  • London dispersion force
  • Metallic bonding
What is the pH if $$[H_3O^+] = 3.5 \times 10^{ -4} $$ M?
  • 3.5
  • 12
  • 0.35
  • $$1 \times 10 ^ {- 14}$$
  • 4
_______ is used in nuclear reactors to slow down their speed and release nuclear energy.
  • Heavy water
  • Soft water
  • Hard water
  • Distilled water
What happens inside water molecules if heat is added when water boils?
  • The energy is stored in the form of potential energy; therefore, the temperature doesn't increase
  • The energy is added as kinetic energy; therefore, the molecules move faster
  • The energy is stored as potential energy; therefore, the molecules move faster
  • The energy is added as kinetic energy; therefore, the temperature increases
  • All options are correct
The kind of water is suitable for use is :
  • hard water
  • soft water
  • both A and B
  • none of above
Which of the gases listed below would not be collected via water displacement? 
  • $$CO_2$$
  • $$CH_4$$
  • $$O_2$$
  • $$NH_3$$
  • $$H_2$$
Which of the following will react violently with water to form a base?
  • Chlorine
  • Cobalt
  • Calcium
  • Aluminum
  • Potassium
Heavy water can be used as :
  • Neutron moderator
  • Production of deuterium
  • Tracer compound
  • All of above
The specific heat capacity of water is:
  • $$1$$ calorie $${g}^{-1}$$
  • $$10$$ calories $${g}^{-1}$$
  • $$2$$ calories $${g}^{-1}$$
  • $$30$$ calorie $${g}^{-1}$$
The energy stored in water formed from ice is:
  • Latent heat of fusion of ice
  • $$80 cal ^{-1}$$
  • Latent heat of boiling
  • Latent heat of fusion of water
When water is cooled it contracts until it reaches ________ and then it starts expanding.
  • $$37^oC$$
  • $$40^oC$$
  • $$0^oC$$
  • $$4^oC$$
By this process, water can be purified in a simple way:
  • Freezing
  • Melting
  • Boiling
  • Evaporating
Water is a __________ oxide.
  • Acidic
  • Neutral
  • Basic
  • Amphoteric
Impurities in water:
  • Lower the freezing point
  • Increase the boiling point
  • Increase the density
  • All the above
Which property of water is used while washing clothes?
  • Odour
  • Colour
  • Solubility
  • Sand
Statement I: Water has a higher boiling point than expected.
Statement II: Each molecule forms a hydrogen bond with an adjacent molecule.
  • Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.
  • Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I. 
  • Statement I is correct, but Statement II is incorrect.
  • Statement I is incorrect, but Statement II is correct.
Statement 1: Water boils below $${100}^{o}C$$ at high altitudes. 
Statement 2: Atmospheric pressure varies inversely with altitude.
  • Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
  • Both the Statement 1 and Statement 2 are correct and Statement 2 is NOT the correct explanation of Statement 1.
  • Statement 1 is correct but Statement 2 is not correct.
  • Statement 1 is not correct but Statement 2 is correct.
  • Both the Statement 1 and Statement 2 are not correct.
Liquids with lower boiling point are more :
  • viscous
  • volatile
  • non-volatile
  • none of these
State whether true or false:
The present position of hydrogen in the modern periodic table completely justifiable.
  • True
  • False
Statement $$1$$: Water boils at a higher temperature on the moon.
Statement $$2$$: The atmospheric pressure of the moon is less than that on earth.
  • Both Statement $$1$$ and Statement $$2$$ are correct and Statement 2 is the correct explanation of Statement $$1$$
  • Both Statement $$1$$ and Statement $$2$$ are correct, but Statement $$2$$ is NOT the correct explanation of Statement $$1$$
  • Statement $$1$$ is correct, but Statement $$2$$ is not correct
  • Statement $$1$$ is not correct, but Statement $$2$$ is correct
Which of the following is NOT soluble in water?
  • Salt
  • Sugar
  • Oxygen
  • Sand
Balance the chemical reaction of laboratory preparation method of dihydrogen:
  • $$Zn + 2H^+ \ \longrightarrow Zn^{2+} +\ H_2$$
  • $$Zn^{2+} + 2H^- \ \longrightarrow Zn +\ H_2$$
  • $$Zn^{2+} + 2H^+ \ \longrightarrow Zn^{2+} +\ H_2$$
  • None of the above
When steam is passed over red hot iron we get which of the following products?
  • Ferric hydroxide and hydrogen
  • Ferric oxide and hydrogen
  • Ferrous hydroxide and hydrogen
  • Ferrous oxide and hydrogen
Which of the following would describe the behavior of the molecules or ions of $$AgNO_{3}(s)$$ in water?
  • $$Ag^{+}$$ ions are surrounded by the oxygen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the hydrogen's of water molecules.
  • $$Ag^{+}$$ ions are surrounded by the hydrogen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the oxygen's of water molecules.
  • $$Ag^{+}$$ ions are surrounded by the oxygen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the oxygen's of water molecules.
  • $$AgNO_{3}$$ does not separate into ions in water because it is not water soluble.
Water is considered an amphoteric substance. Which of following other substances can also be considered amphoteric?
  • $$H_{2}SO_{4}$$
  • $$HSO_{4}^{-}$$
  • $$SO_{4}^{2-}$$
  • $$CO_{3}^{2-}$$
Consider a lab in which a hydrate is heated to determine the waters of hydration.
Which error would increase the calculated number of waters of hydration?
  • Touching crucible and leaving fingerprints after heating, but before the final weighing.
  • Incomplete heating, not heating until a constant mass is obtained.
  • The hydrate sample was contaminated with another ionic substance that has a melting point such higher than $$100$$ degrees Celsius.
  • While transferring the crucible containing the anhydrous material to the balance for massing, the crucible tongs touched the product, leaving some of the solid product on the tongs.
Which of the following particle diagrams BEST represents the structure of ice, $$H_{2}O(s)$$?
Which laboratory procedure will produce the data necessary to determine the waters of hydration in a hydrate?
  • Reacting the hydrate with a base to neutralize and produce water. The amount and concentration of base used should be recorded as well as the final mass of water produced.
  • Reacting the hydrate with a acid to neutralize and produce water. The amount and concentration of base used should be recorded as well as the final mass of water produced.
  • Recording the amount of water in mL added to the anhydrous material until it is a saturated hydrate.
  • Recording the mass of the hydrate before heating and then recording the mass of the anhydrous salt after heating, until constant mass is obtained.

Which of the following hydride is 'electron-precise' type?
  • $$HF$$
  • $$H_2O$$
  • $$SiH_4$$
  • $$PH_3$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Chemistry Quiz Questions and Answers