Question

A students observation is given below: 

i. When Zn is put in salt solution, Na gets deposited over Zn. 

ii. Au reacts with water vapour and hydrogen gas is formed. 

iii. Al reacts with acid and forms hydrogen gas. 

iv. Mg reacts with hot water and forms hydrogen gas.

a. Which statements are incorrect?

b. Give reason for your answer.

Answer 1

a. Statements (i) and (ii) are wrong. 

b. i. Zn cannot displace sodium. Because sodium has a higher reactivity than Zn. 

ii. Au does not react with water vapour.