Question

17) What happens when zinc metal is added to sulphuric acid ? Write the equation for this
reaction. What is the characteristic test for hydrogen gas?
(3)​

Answer 1

Answer:

Explanation:

Zinc metal gives hydrogen gas when it is treated with dilute sulphuric acid. Hydrogen gas is utilized in hydrogenation of oil.

Zn+2HCl→ZnCl  

2

​  

+H  

2

​  

 

Therefore, the gas evolved is hydrogen.

Test for hydrogen gas: When a burning candle is brought near the hydrogen gas, it burns with pop sound which confirms the presence of hydrogen gas.

Answer 2

Explanation:

Zinc metal dissolves slowly in dilute sulphuric acid to form solutions containing the aquated Zn(II) ion together with hydrogen gas, H2.