In which of the following redox reaction precipitate is not formed?

Question

In which of the following redox reaction precipitate is not formed?, C r 3 + ( a q ) + N a 2 O 2 (Solution) →, F e 3 + ( a q ) + ( N H 4 ) 2 S →, M n 2 + ( a q ) + H 2 O 2 + N H 3 ( S o l u t i o n ) →, F e 2 + ( a q ) + N a 2 O 2 ( S o l u t i o n ) →

MARKS App · Accepted Answer

C r 3 + ( a q ) + N a 2 O 2 S o l . → C r O 4 2 - ( a q ) (Solution) no precipitate F e 3 + ( a q ) + ( N H 4 ) 2 S → F e S ↓ M n 2 + ( a q ) + H 2 O 2 + N H 3 → M n O ( O H ) 2 ↓ or M n O 2 ↓ 2 H 2 O F e 2 + ( a q ) + N a 2 O 2 → F e ( O H ) 3 ↓

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