Question

science class 10 activity 2.9
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Answer 1

Answer:

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Explanation:

Procedure:

Activity 2.9 asks us to react solid sodium chloride with concentrated sulphuric acid and check if the gas evolved turn the blue litmus paper into red or not.

Observation:

Gas fumes produce but do not turn the blue litmus paper into the red.

Explanation:

Solid sodium chloride reacts with concentrated sulphuric acid and forms dry hydrochloric acid gas. Here HCl is produced in gaseous form as there is no water.

NaCl(S) + H2SO4(Conc.) ———> Na2SO4 (s)+ HCl(g)

explanation

A litmus paper works on H+  or OH- ion. Since there is no water in HCl gas, HCl does not dissociate into its ion and does not turn the blue litmus red.

HCl (aq) ——-> H+ + Cl–

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