CBSE Questions for Class 11 Medical Chemistry Some Basic Concepts Of Chemistry Quiz 1 - MCQExams.com

Avogadro's number of Krypton atoms (Atomic weight = $$83.8 u$$) weigh:
  • $$83.8 g$$
  • $$1.00 g$$
  • $$81.8 g$$
  • $$78 g$$
Which gas law relates the volume of a gas to the number of molecules of the gas?
  • Gay-Lussac's Law
  • Avogadro's Law
  • Boyle's Law
  • Charle's Law
What is a chemical reaction?
  • Reaction that is always endergonic.
  • Rearrangement of electrons in a chemical bond.
  • Both $$A$$ and $$B$$.
  • None of the above.
When magnesium is burnt in air, the weight of magnesium :
  • increases
  • decreases
  • remains same
  • Depends on the atmosphere
What percent of a sample of nitrogen must be allowed to escape if its temperature, pressure, and volume are to be changed from $$220^oC$$,3 atm and 1.65 L to $$110^oC$$, 0.7 atm and 1 L respectively?
  • $$41.4\%$$
  • $$8.18\%$$
  • $$4.14\%$$
  • $$81.8\%$$
A mixture of $$S{O_2}$$ and $${O_2}$$ was made to react in such a way that every gram of mixture gives maximum amount of $$S{O_3}$$. The mass % of $$S{O_2}$$ in the mixture is 
  • 30 %
  • 80 %
  • 60 %
  • None of these
What is atomic mass of $$He$$ in amu $$(u)$$ units?
  • $$8$$
  • $$9$$
  • $$2$$
  • $$4$$
What should be the weight of $$50\%$$ $$HCl$$ which reacts with $$100g$$ of limestone?
  • $$50%$$ pure
  • $$25%$$ pure
  • $$10%$$ pure
  • $$8%$$ pure
If Avogadro number $$N_A$$ is changed from $$6.022\times 10^{23} mol^{-1}$$ to $$6.022\times 10^{20} mol^{-1}$$, this would change :
  • the ratio of chemical species to each other in a balanced equation
  • the ratio of elements to each other in a compound
  • the definition of mass in units of grams
  • the mass of one mole of carbon
A certain sample of element Z contains 60% of $$^{69}{Z}$$ and 40% $$^{71}{Z}$$ . What is the relative atomic mass of element Z in this sample?
  • 69.2
  • 69.8
  • 70.0
  • 70.2
At same temperature and pressure, equal volumes of gases contain the same number of:
  • molecules
  • electrons
  • protons
  • particles
Which of the following property of an element never changes?
  • Valency
  • Atomic weight
  • Both A and B
  • None of the above
Which one of the following properties of an element is not variable?
  • Valency
  • Atomic weight
  • Equivalent weight
  • All of these
A balanced chemical equation is in accordance with the law of conservation of mass.
  • True
  • False
According to the Avogadro's Law, equal volumes of two different gases, under same conditions of temperature and pressure, contain equal number of:
  • atoms
  • molecules
  • electrons
  • protons
Equal volume of gases contain equal number of moles.
State whether the above statement is true or false.
  • The statement is True
  • The statement is False
  • Neither
  • Equal volume of gases contain equal number of moles, only when the temperature is increased
The value of 1 amu is equal to:
  • $$1.66\times 10^{-8}g$$
  • $$1.66\times 10^{-4}g$$
  • $$1.66\times 10^{-16}g$$
  • $$1.66\times 10^{-24}g$$
Avogadro's law finds an application in the determination of:
  • Atomicity of gas
  • Molecular weights of gases
  • Molecular formula of certain gaseous compounds
  • All the above
Mass of one twelth of carbon atom is called atomic mass unit.
  • True
  • False
Which of the following is used as standard for determination of atomic mass unit?
  • $$O^{16}$$
  • $$C^{12}$$
  • $$H^{1}$$
  • $$O^{17}$$
The mass number of sulfur atom is:

(Given: Atomic number = 16 and number of neutrons = 16)
  • 18
  • 32
  • 24
  • 16
The average mass of the atom as compared to $$\frac{1}{12}^{th}$$ the mass of one carbon-12 atom is known as :
  • molecular mass
  • atomic mass
  • relative molecular mass
  • relative atomic mass
Which is the lightest element in the universe?
  • Helium
  • Hydrogen
  • Nitrogen
  • Silicon
Mass of atom expressed in atomic mass unit is :
  • Atomic mass
  • Molecular mass
  • Atomic number 
  • None of the above
What is the atomic mass (u) of calcium?
  • 10
  • 20
  • 30
  • 40
A device for measuring temperatures at a distance is:
  • gas thermometer
  • mercury thermometer
  • radiation pyrometer
  • maximum-minimum thermometer
One a.m.u is defined as mass of  :
  • $$\frac{1}{16}^{th}$$ mass of one oxygen atom
  • $$\frac{1}{14}^{th}$$ mass of one atom of nitrogen
  • $$\frac{1}{12}^{th}$$ mass of one carbon-12 atom
  • None of above
India's uranium supply comes mainly from the Jaduguda mines in:
  • Bihar
  • Madhya Pradesh
  • Maharashtra
  • None of these
Which of the following expression of concentration of a solution is independent of temperature?
  • $$Molarity$$
  • $$Normality$$
  • $$Formality$$
  • $$Molality$$
What is chemistry?
  • Study of substances.
  • Investigation of reactions and properties.
  • Study of reactions to form new substances.
  • All of the above.
French chemist ____ laid the foundation to the scientific investigation of matter by describing that substances react by following certain laws.
  • Dalton
  • Rutherford
  • Antony van Leeuwenhoek
  • A. Lavoisier
Chemistry is sometimes called as:
  • Biological Science
  • Central Science
  • Biochemistry
  • Both A and C
Definition of chemistry is:
  • physical science that studies the composition, structure, properties and change of matter
  • biological science that helps to study the basic functioning of nervous system
  • science that helps in studying the galaxy
  • physical science that studies the biotic and abiotic aspects of environment
What is % composition of a substance?
  • Sum of all the components.
  • % composition of the sum of two components.
  • % of the total mass of a substance.
  • None of the above.
% composition requires ................ of the compound :
  • molar mass
  • temperature
  • atmospheric pressure
  • both a and b
The laws of chemical combination formed on the basis of :
  • Dalton's atomic theory
  • Dalton's mass theory
  • Both A and B
  • None of the above
Chemical hypothesis first emerged in Classical Greece by:
  • Einstein
  • Louis Pasteur
  • Aristotle
  • Leuweenhock
What is the atomic mass (u) of sodium?
  • 22
  • 23
  • 23.5
  • 24
Who is considered as the founding father of chemistry?
  • Boyle
  • Aristotle
  • Sir Francis
  • John Mayow
Which term describes the mass of $$6.022\times { 10 }^{ 23 }$$ representative particles?
  • Molar mass
  • Avogadro's number
  • Empirical formula
  • Molecular formula
$$1\ u = $$ ?
  • The mass of one atom of the carbon-12 isotope
  • $${1}/{12}$$th the mass of one atom of the carbon-16 isotope
  • $${1}/{12}$$th the mass of one atom of the carbon-12 isotope
  • The mass of one atom of the carbon-16 isotope
Which statement is linked with the idea that two identical containers filled with different gases will contain the same number of particles?
  • Mosely
  • Avagadro
  • Dalton
  • Mendeleev
The relative atomic mass of hydrogen atom is:
  • $$1$$
  • $$1.008$$
  • $$1.08$$
  • $$1.0008$$
Which is the 1$$^{st}$$ organic compound synthesized in lab?
  • Urea
  • Methanol
  • Ammonia
  • Sulphuric Acid
Who is called father of modern chemistry ?
  • Antoine Lavoisier
  • Gilbert Lewis
  • Gibbs
  • Otto Hahn
What is the volume of $$3.0\times {10}^{20}$$ molecules of $$HCl (g)$$?
  • $$11.2L$$
  • $$0.0224L$$
  • $$0.0112L$$
  • $$22.4L$$
All gases have the same number of moles in the same volume at constant temperature and pressure.
  • Boyle's Law
  • Charles's Law
  • Avogadro's Principle
  • Ideal Gas Law
Branch of chemistry deals with structure of matter, the energy changes and theories, laws and principles that explain the transfer motion of matter for one form to another is known as :
  • Physical chemistry
  • Inorganic chemistry
  • Organic chemistry
  • Analytical chemistry
This is the branch of chemistry deals with chemistry of elements other than carbon and of their compounds :
  • Physical chemistry
  • Inorganic chemistry
  • Organic chemistry
  • Analytical chemistry
Which of the following statements is the most accurate with regard to the significance of Avogadro's number, $$6.02 \times 10^{23}$$ ?
  • It is the conversion factor between grams and atomic mass units.
  • It is a universal physical constant just as the speed of light.
  • It is the number of particles that is required to fill a $$1\ L$$ container.
  • It is the inverse diameter of an $$H$$ atom .
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