Question

10 mL of HCl and 10 mL of NaOH solutions are taken in two separate beakers
labelled I and II respectively. On adding Zinc granules to both, it is observed
that at room temperature
(a) Gas is evolved vigorously in both
(b) Gas is evolved vigorously in beaker I and not in the beaker II
(c) Gas is evolved vigorously in beaker II but not in the beaker I
(d) No gas is evolved in either of the two beakers

Answer 1

The correct option is (b)

Gas is evolved vigorously in the beaker 1 with HCL and not in beaker 2 with NaOH. This is because zinc reacts very fast with the HCL and very slowly with the NaOH at room temperature.


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Answer 2

HCl is an acid and Zn  is a metal  when they perform a reaction  the product will be salt and Hydrogen gas.

The reaction:-

                   Zn  + HCl   →     ZnCl₂( zinc- cloride)+ H₂  

In this reaction, hydrogen gas is bubbled out fast as the reaction proceeds vigorously.

 NaOH is a  base and Zn is a metal  when they react the product will be  salt and the evolution of hydrogen gas.

The reaction:-

                   2NaOH ( base)+ Zn(metal)     →  Na₂ZnO₂( sodium zincate) + H₂

This reaction is not as vigorous as the reaction of Zn and HCl.  

So the correct option is (b) gas is evolved vigorously in beaker I but not so in beaker II.