NDA CHEMISTRY QUIZ

Question 1:

Nitrogen and oxygen combine to form two oxides, Nitric oxide(NO) and nitrogen dioxide in which the ratio of the weights of nitrogen and oxygen is respectively 14:16 and 14:32 . This illustrates the

Law of multiple proportions

Law of reciprocal proportions

Law of conservation of mass

Law of constant proportions

Question 2:

If there are two gases , nitrogen dioxide gas and carbon dioxide gas , both have same volume at same temperature and pressure , then ratio of number of moles of gases is

1:2

1:3

1:1

2:3

Question 3:

Consider three compounds phosphorus trihydride , phosphorous trichloride and hydrogen chloride .Data is given below -

Which of the following law is applicable and also tell in which ratio by weight hydrogen and chlorine combine ?

Law of multiple proportion , 1: 35

Law of reciprocal proportion , 1:35.5

Law of reciprocal proportion, 35.5 : 1

Law of multiple proportion , 1: 32

Question 4:

Chemical equation is balanced to satisfy

Law of definite proportions

Law of conservation of mass

Law of reciprocal proportion

Law of multiple proportion

Question 5:

Which of the following is the example of the law of conservation of mass?

12 g of carbon combines with 32 g of oxygen to form 44g of CO2

When 12g of carbon is heated in air gives 14 g of carbon dioxide gas

10 g of hydrogen gas combine with 20 g of oxygen gas to give 25 g of water .

5 g of calcium oxide reacts with 10 g of water to form 10 g of slaked lime .

Question 6:

Alpha decay of radium to radon always follow

Conservation of energy

Conservation of charge

Conservation of matter

Law of multiple proportion

Question 7:

Who discovered the law of definite proportions ?

Jeremias Richter

Benjamin Franklin

Joseph Proust

John Dalton

Question 8:

Which of the following pair does not illustrate the law of multiple proportion ?

Sulphur dioxide and sulphur trioxide

Calcium oxide and calcium Hydroxide

Carbon monoxide and carbon dioxide

Water and hydrogen peroxide

Question 9:

The percentage of calcium and oxygen in samples of calcium oxide obtained by different methods were found to be the same. This illustrates the law of

Definite proportions

Conservation of mass

Multiple proportions

Reciprocal proportions

Question 10:

The ratio by weight by which sodium and oxygen combine to give sodium peroxide ?

23:16

46:16

23:32

46:18

NDA CHEMISTRY QUIZ - 5

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NDA CHEMISTRY QUIZ - 5

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