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15. CHOH). (+ H,02()+ OH-> 16. Cro. (ag) + Pb ) → 17. Znag) + NH3(g) + H20 (until basie) → 18. Zn(OH)2 (+ NH3(y (excess) → 19

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15.

2 Cr(OH)4- (aq) + 3 H2O2 (aq) + 2 OH- (aq) --------------> 2 CrO42- (aq) + 8 H2O (l)

This is a type of Redox reaction in which H2O2 act as Reducing agent.

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16.

CrO42- (aq) + Pb2+ (aq) --------------> PbCrO4 (s)

This is a type of precipitation reaction in which PbCrO4 (s) forms yellow precipitate.

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17.

Zn2+ (aq) + 2 NH3 (aq) + 2 H2O (l) (until basic)-----> Zn(OH)2 (s) + 2 NH4+ (aq)

This is a type of precipitation reaction in which Zn(OH)2 (s) forms precipitate.

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18. Zn(OH)2 (s) + 4 NH3 (aq) (excess) -----> [Zn(NH3)4]2+ (aq) + 2 OH- (aq)

Complex formation reaction in which complex of ammonia i.e. [Zn(NH3)4]2+ (aq) is formed.

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19. Zn2+ (aq) + 4 NH3 (aq) (excess) -----> [Zn(NH3)4]2+ (aq)

Complex formation reaction in which complex of ammonia i.e. [Zn(NH3)4]2+ (aq) is formed.

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