Question

Write what kind of effect of following matters seems on litmus paper.

(i) Lemon Juice (ii) NH3 gas containing moisture

(iii) Dry HCl gas (iv) Curd​

Answer 1

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What will be the effect of a litmus paper on these matters:-

• lemon Juice
• $\sf NH_{3}$ gas
• Dry HCl gas
• Curd

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• Litmus paper turn $\sf\red{red}$ in acids and $\sf\blue{Blue}$ in bases.

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(i) we know that Lemon juice contains citric acid. So, Lemon juice is Acidic is nature.

$\sf \therefore \: litmus \: will \: turn \: \red{red}$

(ii) $\sf NH_{3}$ is weak base.

$\sf \therefore \: litmus \: will \: turn \: \blue{blue}$

(iii) Acids Show their acidic properties only in presence of water. since, Dry HCl gas lacks in water, it cannot show its acidic property.

$\sf \therefore \: it \: will \: have \: \green{no \: effect} \: on \: litmus$

NOTE:- dry HCl gas will turn red only in presence of water. Hence, when wet litmus paper is brought towards it, Dry HCl will turn red.

(iv) Curd contains Lactic acid. So, it is acidic in nature.

$\sf \therefore \: litmus \: will \: turn \: \red{red}$