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Laws of Chemical Combination-MCQ-Basic Level

Dear Readers,

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. 1.0 g of an oxide of A contained 0.5 g of A. 4.0 g of another oxide of A contained 1.6 g of A. The data indicate the law of

  •  Reciprocal proportions
  •  Constant proportions
  •  Conservation of energy
  •  Multiple proportions

The above data indicated the Law of Multiple proportions.

Q2. Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of

  •  Conservation of mass
  •  Constant composition
  •  Multiple proportions
  •  Constant volume

Above Statement explains the Law of Constant Composition.

Q3. Two samples of lead oxide were separately reduced to metallic lead by heating in a current of hydrogen. The weight of lead from one oxide was half the weight of lead obtained from the other oxide. The data illustrates

  •  Law of reciprocal proportions
  •  Law of constant proportions
  •  Law of multiple proportions
  •  Law of equivalent proportions

The above data indicates Law of multiple proportions.

Q4. The law of multiple proportions was proposed by

  •  Lavoisier
  •  Dalton
  •  Proust
  •  Gay-Lussac

The law of multiple proportions was proposed by Dalton.

Q5. Avogadro number is

  •  Number of atoms one gram of element
  •  Number of milli litres which one mole of a gaseous substances occupies at NTP
  •  Number of molecules present in one gram molecular mass of a substance
  •  All of these

Number of molecules present in one gram molecular mass of a substance

Q6. Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively 12 : 16 and 12 : 32. These figures illustrate the

  •  Law of multiple proportions
  •  Law of reciprocal proportions
  •  Law of conservation of mass
  •  Law of constant proportions

Law of multiple proportions.

Q7. The law of multiple proportions is illustrated by the two compounds

  •  Sodium chloride and sodium bromide
  •  Ordinary water and heavy water
  •  Caustic soda and caustic potash
  •  Sulphur dioxide and sulphur trioxide

Sulphur dioxide and sulphur trioxide

Q8. One sample of atmospheric air is found to have 0.03% of carbon dioxide and another sample 0.04%. this is evidence that

  •  The law of constant composition is not always true
  •   The law of multiple proportions is true
  •  Air is a compound
  •  Air is a mixture

Air is a Mixture

Q9. After a chemical reaction, the total mass of reactants and products

  •  Is always increased
  •  Is always decreased
  •  Is not changed
  •  Is always less or more

the total mass of reactants and products remains same before and after a chemical reaction.

Q10. The law of definite proportions is not applicable to nitrogen oxide because

  •  Nitrogen atomic weight is not constant
  •  Nitrogen molecular weight is variable
  •  Nitrogen equivalent weight is variable
  •  Oxygen atomic weight is variable

Nitrogen equivalent weight is variable



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