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. Blue litmus paper is brought near the mouth of the delivery tube to check the presence of HCl acid but no change is observed in the colour of litmus paper because:
1]The litmus paper used is moist
2]The litmus paper used is dry
3]Blue litmus paper does not change its color with an acid
4]The litmus paper is kept very close to the mouth of the delivery tube

Answer 1

Answer:

2)because the litmus paper used is dry.

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Answer 2

Option2 is the correct answer, The litmus paper used is dry

Explanation:

• The Reaction is carried out between conc. sulphuric acid and sodium chloride, which react with each other to form $HCl$gas
• Blue litmus paper is brought near the mouth of the delivery tube
• To check the presence of HCl acid
• $HCl$ gas is produced

$2NaCl + H2SO4$→$Na2SO4 + 2HCl$

• The produced $HCl$ gas is passed through dry litmus paper

• No change is observed in the colour of litmus paper.
• It cannot show acidic properties and hydrogen ion is not present.
• But when the gas is passed through moist litmus paper shows colour change and it turns to red colour.
• The change in colour is due to the presence of acidic properties.