Question

Write the Chemical test to identify the following gases [4]
1) NH3 (2) H2S (3) Cl2 (4) HCl


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Answer 1

Answer:

NH3

it is having pungent smell

a rod dipped in HCl when brought near it gives dense white fumes and turns red litmus blue

H2S

it is having rotten egg like smell it turns lead acetate paper black

Cl2

greenish yellow in colour it turns blue Litmus red and finally bleaches at it turns moist starch iodide paper blue black

HCl

a rod dipped in ammonia when brought near to it it gives dense white fumes and turns blue Litmus red

Explanation:

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Answer 2

Explanation:

1. NH3 can be identified by adding dilute NaOH in it and heating. If ammonia ions are present it will convert to NH4.

2. H2S can be identified by firstly adding lead acetate strip in water and check for a colour if it is present, strips will change colour.

3. Cl2 make damp iodide paper blue-black and it turns blue litmus paper red.

4. HCl in aqueous solution can be identified by adding silver nitrate solution and wait till white precipitate forms.