Question

heation of Zine granules with dilute sulphurie
acid and testing hydrogen gas by burning​

Answer 1

Answer:

In place of zinc granules, same amount of zinc dust is taken in the test tube

Instead of dilute sulphuric acid, dilute hydrochloric acid is taken

In place of zinc, copper turnings are taken

Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.

Explanation:

(a) When zinc dust is taken instead of zinc granules to react with sulphuric acid, the hydrogen gas is formed. But the rate of reaction increases in the case of zinc dust compared to the zinc granules, because of increase in surface area as increase in surface are increases the rate of reaction. Thus, when zinc dust is used in the place of zinc granules, hydrogen gas is produced at a faster rate.

(b) Zinc granules give hydrogen gas; along with zinc chloride; when they react with hydrochloric acid.

Zn + 2HCl ⇨ ZnCl2 + H2O

Thus, when hydrochloric acid is used at the place of sulphuric acid, zinc chloride is formed in place of zinc sulphate; along with hydrogen gas and reaction takes place at the same rate.

(c) Copper does not react with dilute acids in normal condition because copper lies at lower position in reactivity series and is considered as a noble metal.

So, if copper turning is taken in place of zinc granules, no reaction will take place.

(d) If sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated, sodium zincate is formed along with hydrogen gas. But heating of test tube will increase the rate of formation of hydrogen gas as heating of reaction mixture increases the rate of reaction.

Zn + 2NaOH ⇨ Na2ZnO2 + H2

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