Question

In: Chemistry

Identify the equation(s) that represents a redox reaction. A. Ca(s) + 2 H2O(l) → Ca(OH)2(s) +...

Identify the equation(s) that represents a redox reaction.

A. Ca(s) + 2 H2O(l) → Ca(OH)2(s) + H2(g)

B. H2CO3(aq)→ H2O(l) + CO2(g)

C. 4 Fe(OH)2(s) + 2 H2O(l) + O2(g) → 4 Fe(OH)3(s)

D. CdCl2(aq) + Na2S(aq) → CdS(s) + 2 NaCl(aq)

E. CuS(s) + H2(g) → H2S(g) + Cu(s)

Solutions

Expert Solution

A)

oxidation state of Ca changes from 0 to +2.

So, Ca is getting oxidised.

Oxidation state of H changes from +1 to 0

So, H is getting reduced.

Hence this is redox reaction

B)

Oxidation state of O is -2 on both sides

Oxidation state of H is +1 on both sides

Oxidation state of C is +4 on both sides

Hence this is not a redox reaction

C)

oxidation state of Fe changes from +2 to +3.

So, Fe is getting oxidised.

Oxidation state of O changes from 0 in O2 to -2 in Fe(OH)3

So, O is getting reduced.

Hence this is redox reaction

D)

Oxidation state of S is -2 on both sides

Oxidation state of Cd is +2 on both sides

Oxidation state of Cl is -1 on both sides

Oxidation state of Na is +1 on both sides

Hence this is not a redox reaction

E)

oxidation state of H changes from 0 to +1.

So, H is getting oxidised.

Oxidation state of Cu changes from +2 to 0

So, Cu is getting reduced.

Hence this is redox reaction

Answer: A, C, E

queen_honey_blossom answered 2 years ago
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