Question

(a) How do metals react with hydrogen ? Explain with an example.
(b) How do non-metals react with hydrogen ? Explain with an example.

Lakhmir Singh Chemistry Class 10

Answer 1

a) Most of the metals do not react with hydrogen . Only a few reactive metals react with hydrogen to form metal hydrides . For example : When Hydrogen gas is passed over heated sodium , then sodium hydride is formed .

b) Non-metals react with hydrogen to form covalent hydrides . For example : Sulphur combines with hydrogen to form Hydrogen sulphide .

Answer 2

Answer:

For a: Metals react with hydrogen to form metal hydrides.

For b: Non-metals react with hydrogen to form covalent hydrides.

Explanation:

Elemental hydrogen is very reactive in nature.

• For a:

Metals are the species which loose electrons during a chemical reaction. The reaction of metals with hydrogen results in the formation of metal hydrides.

For Example:

$Ca+H_2\rightarrow CaH_2\\\\2Na+H_2\rightarrow 2NaH$

• For b:

Non-metals are the species which gain electrons during a chemical reaction. The reaction of non-metals with hydrogen results in the formation of covalent hydrides. Hydrogen is considered as a non-metal only and reaction between two on-metals is always covalent in nature.

For Example:

$H_2+S\righatrrow H_2S\\\\N_2+3H_2\rightarrow 2NH_3$