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Chemistry

Give an example of each of the following chemical changes.

(a) A photochemical reaction involving 1. silver salt 2. water

(b) A reaction involving 1. blue solution 2. formation of a dirty green precipitate

(c) Two gases combine to form a white solid.

(d) Two solids combine to form a liquid.

(e) A reaction where color change is noticed.

Chemical Reaction

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Answer

(a) A photochemical reaction involving 1. silver salt
2AgNO3 sunlight\xrightarrow{\text{sunlight}} 2Ag + 2NO2 ↑ + O2 ↑ 2. water
Cl2 + H2O sunlight\xrightarrow{\text{sunlight}} HCl + HClO

(b) A reaction involving 1. blue solution

Fe iron+CuSO4 blue sol.FeSO4 green sol.+Cu copper-brown red deposit\underset{\text{ iron}}{\text{Fe}} + \underset{\text{ blue sol.}}{\text{CuSO}4} \longrightarrow \underset{\text{ green sol.}}{\text{FeSO}4} + \underset{\text{ copper-brown red deposit}}{\text{Cu}}

2. formation of a dirty green precipitate

FeSO4 ferrous sulphate+2NaOH sodium hydroxideFe(OH)2 dirty green ppt. +Na2SO4 sodium sulphate\underset{\text{ ferrous sulphate}}{\text{FeSO}4} + \underset{\text{ sodium hydroxide}}{2\text{NaOH}} \longrightarrow \underset{\text{ dirty green ppt. }}{\text{Fe(OH)}2}↓ + \underset{\text{ sodium sulphate}}{\text{Na}2\text{SO}4}

(c) Two gases combine to form a white solid.

NH3 (g) + HCl (g) ⟶ NH4Cl (s)

(d) Two solids combine to form a liquid.

C (s) + 2S (s) ⟶ CS2 (l)

(e) A reaction where color change is noticed.

Fe iron+CuSO4 blue sol. (aq.)FeSO4 green sol.+Cu copper-brown red deposit\underset{\text{ iron}}{\text{Fe}} + \underset{\text{ blue sol.}}{\text{CuSO}4} \text{ (aq.)} \longrightarrow \underset{\text{ green sol.}}{\text{FeSO}4} + \underset{\text{ copper-brown red deposit}}{\text{Cu}}

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