Test on law of chemical combinations (Chemistry) Class : XI

Answer the following questions:

Choose correct options

1. A balanced chemical equation is in accordance with:

a. Avogadro’s law

b. Law of conservation of mass

c. Law of gaseous volumes

d. All of the laws above.

2.  Which one of the following pair of substances illustrates law of multiple proportions?

a. Calcium oxide and calcium hydroxide

b. Sodium chloride and sodium bromide

c. Carbon monoxide and carbon dioxide

d. None of these

3 The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:

a. Constant proportion

b. Conservation of mass

c. Multiple proportions

d. Reciprocal proportion

Match the following:

Column A

1. Law of conservation of mass
2. Law of definite proportions
3. Law of multiple proportions
4. Law of reciprocal proportions
5. Law of combining volumes

Column B 

1. Joseph Proust
2. Antoine Lavoisier
3. Richter
4. Gay lussac
5. Dalton

Answers:

1 b

2 c

3 a

Match

1 vs 2

2 vs 1

3 vs 5

4 vs 3

5 vs 4