When $Zn$ metal is treated with a dilute solution of a strong acid,a gas is evolved,which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.

(N/A) When $Zn$ reacts with a dilute solution of a strong acid (such as $HCl$),it forms a salt and hydrogen gas $(H_2)$ is evolved.
The chemical equation is: $Zn(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + H_2(g) \uparrow$.
Test to detect the gas: When a burning splinter is brought near the mouth of the test tube containing the gas,it burns with a characteristic 'pop' sound,which confirms the presence of hydrogen gas.