Q12 of 203 Page 151

If the valency of hydrogen is 1 and that of nitrogen is 3, work out the formula for ammonia.

The valency of hydrogen is 1 and that of nitrogen is 3. So according to the valencies of both the elements present in ammonia, The formula becomes NH3.


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10

Fill in the following blanks with suitable words:

(a) The particle which is formed by the gain of electrons by an atom is called ………….


(b) The particle which is formed by the loss of electrons by an atom is called ………….


(c) The particle which is formed by the loss or gain of electrons by an atom is called ……….


(d) A potassium ion has positive change because it contains less …………. than ………….


(e) A sulphide ion has negative charge because it contains less …………… than ……………

 11

Name the elements water is made of. What are the valencies of these elements? Work out the chemical formula for water.

 13

Work out the formula for sulphur dioxide. (Valencies: S = 4; O = 2)

 14

If the valency of carbon is 4 and that of sulphur is 2, work out the formula of the compound formed by the combination of carbon with sulphur. What is the name of this compound?