Question

2 ml of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube when the contents are formed a gas evolved which is bubbled through a soft solution way before testing write the equation of the chemical reaction involved and the test to detect a class name the gas which will evolve when the same metals react with dilute solution of a strong acid

Answer 1

2 ml of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube then Sodium Zincate salt is formed and Hydrogen gas is evolved.

Chemical equation: 
2NaOH+ Zn ----> Na2ZnO2 + H2


Same Hydrogen gas will be evolved when a metal reacts with acid.

Zn +2 HCl----> ZnCl2 +H2

Test for hydrogen :
When a burning match stick is brought near H2 gas, It burns with POP sound