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 warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with a dilute solution of a strong acid.
Solution
(i) Reaction is
(ii) The liberated H2 gas can be detected by burning matchstick at the opening of the test tube, it will burn with a pop sound with a blue flame.
(iii) When zinc reacts with dilute HCl it gives zinc chloride and hydrogen gas.
