Question

 The figure given below represents the experiment carried out between conc. sulphuric acid and sodium chloride, which react with each other to form HCl gas.

Options are:

(a) The litmus paper used is dry

(b) The litmus paper used is moist

(c) Blue litmus paper does not change its color with an acid

(d) The litmus paper is kept very close to the mouth of the delivery tube

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Answer 1

Answer:

ans : the litmus paper

used to dry

Answer 2

Final answer:

(a) When $HCl$ gas is passed over dry litmus paper shows no effect.

(b) When $HCl$ gas is passed over moist litmus paper turns blue litmus red, because $HCl$ mixes with water to form $H^{+}$ ions.

(c) Blue litmus paper does not change its colour with an acid due to the litmus paper used is dry.

(d) The litmus paper is kept very close to the mouth of the delivery tube to check the presence of $HCl$ acid but no change is observed in the colour of dry litmus paper and change the colour of moist litmus paper.

Given that: We are given the experiment carried out between conc. sulphuric acid and sodium chloride, which react with each other to form $HCl$ gas.

To find: We have to find what happen,

(a) The litmus paper used is dry.

(b) The litmus paper used is moist.

(c) Blue litmus paper does not change its color with an acid.

(d) The litmus paper is kept very close to the mouth of the delivery tube.

Explanation:

When conc. $H_{2}SO_{4}$ added to solid sodium chloride, $HCl$ gas is produced.

                         $NaCl+H_{2}SO_{4}$ → $NaHSO_{4}+HCl$

• (a) When $HCl$ gas is passed over dry litmus paper shows no effect, because dry $HCl$ gas does not produce $H^{+}$ ions.

Therefore nothing happens to the dry litmus paper.

• (b) When $HCl$ gas is passed over moist litmus paper turns blue litmus red, because $HCl$ mixes with water to form $H^{+}$ ions.

• (c) Blue litmus paper does not change its colour with an acid due to the litmus paper used is dry.

The colour of blue litmus paper changes only in the presence of $H^{+}$ ion or $H_{3}O^{+}$ ions.

$HCl$ produce these ions only in an aqueous solution.

Dry $HCl$ gas shows no change the colour of dry litmus paper.

• (d) The litmus paper is kept very close to the mouth of the delivery tube to check the presence of $HCl$ acid but no change is observed in the colour of dry litmus paper and change the colour of moist litmus paper.

Because there is no $H^{+}$ ions produce in dry litmus paper.

If $H^{+}$ ions are present the blue litmus have changed into red.

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