Question

TWO SUBSTANCE P AND Q REACT SEPARATELY WITH ZINC METAL TO LIBERATE HYDROGEN GAS.GIVE THE REASON WHEN P AND Q REACT WITH OTHER . GIVE ONE TEST FOR HYDROGEN GAS.
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Answer 1

Calcium hydroxide (Ca(OH)2) when treated with chlorine yields bleaching powder.

Ca(OH)2 + Cl2 → CaOCl2 + H2O

hope it helps..xd !!!!!

Answer 2

P is HCl and Q is NaOH. Both P and Q separately react with zinc metal to liberete hydrogen gas. P and Q i.e., HCL and NaOH will react with other as follows:

HCL+NaOH---≥ NaCl +H2O

HYDROGEN GAS BURNS WITH A POP SOUND...