Question

name :
1. two gases which give dense white fumes with ammonia .
2. an acidic gas which react with a basic gas to liberate a neutral gas 3. a metal chloride soluble in ammonium hydroxide

Answer 1

1) chlorine and HCl
2) chlorine + excess of ammonia give nitrogen and NH4Cl
3) cucl2 and zncl2

Answer 2

1. The name of the two gases which give dense white fumes with ammonia.

• When gases such as Hydrochloric acid and chlorine reacts with ammonia, they lead to the evolution of dense white fumes.
• The reason for the formation of dense white fumes is the formation of the product called ammonium chloride.
• The reaction involved is as follows:

$NH_3+HCl\rightarrow NH_4Cl$

$8NH_3+3Cl_2\rightarrow N_2+6NH_4Cl$

2. The name of an acidic gas which reacts with a basic gas to liberate a neutral gas.

• When acidic gas such as hydrochloric acid (HCl) reacts with basic gas such as ammonia ($NH_3$) the following reaction occurs

$HCl+NH_3\rightarrow NH_4Cl$

• As the formed gas is a neutral therefore the acidic gas and basic gas are inferred to be hydrochloric acid (HCl) and ammonia respectively.

3. The name of the metal chloride soluble in ammonium hydroxide.

• Zinc chloride is the metal chloride which is soluble in ammonium hydroxide and produces zinc hydroxide and ammonium chloride.
• The reaction involved is as follows:

$ZnCl_2+2NH_4OH\rightarrow Zn(OH)_2+2NH_4Cl$

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