Chemical laws and law of chemical combination worksheet

Chemical laws and law of chemical combination worksheet:

Chemical laws are the basis of chemistry. Various chemical laws like Law of constant proportion , law of multiple proportion , law of reciprocal proportion , law of conservation of mass , Avogadro’s hypothesis , equivalent weight concept , molecular & atomic weight concept etc. helps us to predict and perform various chemical reactions. In this page you can find worksheet related to chemical laws. Here are given some questions and a list of probable answers you can choose the best answer from the list and check if you are correct or not from the list of correct answers given at the end of this worksheets.



1. Law of definite proportion does not apply to nitrogen oxide because:

a. Atomic weight of nitrogen is not conserved.

b. Molecular weight of nitrogen is variable.

c. Equivalent weight of nitrogen is variable.

d. Atomic weight of oxygen is variable.


2. 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.


3. 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


4. 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 proportion

d. Reciprocal proportion


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

a. Law of reciprocal proportion

b. Law of constant proportion

c. Law of multiple proportion

d. law of equivalent proportion


6.  One part of an element “A” combines with two parts of another element “B”. Six part of the element “C” combines with four part of element “B”. If  A and C combine together the ratio of their weight will be governed by:

a. Law of definite proportion

b. Law of multiple proportion

c. Law of reciprocal proportion

d. Law of conservation of mass


7. In known elements the maximum number is of:

a. Metals

b. Non-metals

c. Metalloids

d. None of the above


8. Avogadro’s number is:

a. Number of atoms in one gram of element

b. Number of liters which one mole of gaseous substance occupies at N.T.P.

c. Number of molecules present on one gram molecular mass of a substance

d. All are correct




1. c

2. b

3. c

4. a

5. c

6. c

7. a

8. c

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