From the following reactions- determine if Ag- is a stronger oxidizing agent than Cu2-a H3PO2aq-4AgNO3aq-2H2Ol- H3POaq-4Ags-4HNO3aqb H3PO2aq-2CuSO4aq-2H2Ol- H3PO4aq-2Cus-H2SO4aqc C6H5CHOl-2-AgNH32-aq-3OH-aq- C6H5COO-aq -2Ags-4NH3aq-2H2Old C6H5CHOl-2Cu2-aq-5OH-aq- No Change observed-

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Byju's Answer

Standard XII

Chemistry

Stoichiometry

From the foll...

Question

From the following reactions, determine if $A g^{+}$ is a stronger oxidizing agent than $C u^{2 +}$ .
(a) $H_{3} P O_{2} (a q) + 4 A g N O_{3} (a q) + 2 H_{2} O (l) \to H_{3} P O (a q) + 4 A g (s) + 4 H N O_{3} (a q)$

(b) $H_{3} P O_{2} (a q) + 2 C u S O_{4} (a q) + 2 H_{2} O (l) \to H_{3} P O_{4} (a q) + 2 C u (s) + H_{2} S O_{4} (a q)$

(c) $C_{6} H_{5} C H O (l) + 2 [A g (N H_{3})_{2}]^{+} (a q) + 3 O H^{-} (a q) \to C_{6} H_{5} C O O^{-} (a q)$ $+ 2 A g (s) + 4 N H_{3} (a q) + 2 H_{2} O (l)$

(d) $C_{6} H_{5} C H O (l) + 2 C u^{2 +} (a q) + 5 O H^{-} (a q) \to$ No Change observed.

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Solution

In the reactions (a) and (b), $A g^{+}$ and $C u^{2 +}$ are oxidizing agents. In the reaction (c) $A g^{+}$ oxidizes benzaldehyde to benzoate ion. In reaction (d) $C u^{2 +}$ cannot oxidize benzaldehyde. Hence, $A g^{+}$ is a stronger oxidizing agent than $C u^{2 +}$ .

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Consider the reactions:
(a) $H_{3} P O_{2} (a q) + 4 A g N O_{3} (a q) + 2 H_{2} O (l) \to H_{3} P O_{4} (a q) + 4 A g (s) + 4 H N O_{3} (a q)$
(b) $H_{3} P O_{2} (a q) + 2 C u S O_{4} (a q) + 2 H_{2} O (l) \to H_{3} P O_{4} (a q) + 2 C u (s) + H_{2} S O_{4} (a q)$
(c) $C_{6} H_{5} C H O (l) + 2 [A g (N H_{3}) 2]^{+} (a q) + 3 O H^{-} (a q) \to C_{6} H_{5} C O O^{-} (a q) + 2 A g (s) + 4 N H_{3} (a q) + 2 H_{2} O (l)$
(d) $C_{6} H_{5} C H O (l) + 2 C u^{2 +} (a q) + 5 O H^{-} (a q) \to$ No change observed.
What inference do you draw about the behaviour of $A g^{+} a n d C u^{2 +}$ from these reactions?

Identify the substance oxidised, reduced, oxidising agent and reducing agent for each of the following reactions:

(a) 2AgBr (s) + C₆H₆O₂(aq) → 2Ag(s) + 2HBr (aq) + C₆H₄O₂(aq)

(b) HCHO(l) + 2[Ag (NH₃)₂]⁺(aq) + 3OH^–(aq) → 2Ag(s) + HCOO^–(aq) + 4NH₃(aq) + 2H₂O(l)

(d) N₂H₄(l) + 2H₂O₂(l) → N₂(g) + 4H₂O(l)

(e) Pb(s) + PbO₂(s) + 2H₂SO₄(aq) → 2PbSO₄(s) + 2H₂O(l)

Q. Identify the substance oxidised, reduced, oxidising agent and reducing agent for the following reaction.

{H C H O}_{(l)} + 2 [A g (N H_{3})_{2}]_{(a q)}^{+} + 3 O H_{(a q)}^{-} \to 2 A g_{(s)} + H C O O_{(a q)}^{-} + 4 {N H_{3}}_{(a q)} + 2 {H_{2} O}_{(l)}

Q. Using electron-transfer concept, identify the oxidant and reductant in the following redox reactions.
(a)

Z n (s) + 2 H^{+} (a q) ⟶ Z n^{2 +} (a q) + H_{2} (g)

(b)

2 [F e (C N)_{6}]^{3 -} (a q) + 2 O H^{-} (a q) + H_{2} O_{2} (a q) \to 2 [F e (C N)_{6}]^{4 -} (a q) + 2 H_{2} O (l)

(c)

2 [F e (C N)_{6}]^{3 -} (a q) + 2 O H^{-} (a q) + H_{2} O_{2} (a q) \to 2 [F e (C N)_{6}]^{4 -} (a q) + O_{2} (g) + 2 H_{2} O (l)

Q. In the electrolytic refining of copper using

C u S O_{4}

as the electrolyte, the anode reaction is

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In the reactions (a) and (b), Ag+ and Cu2+ are oxidizing agents. In the reaction (c) Ag+ oxidizes benzaldehyde to benzoate ion. In reaction (d) Cu2+ cannot oxidize benzaldehyde. Hence, Ag+ is a stronger oxidizing agent than Cu2+ .

In the reactions (a) and (b), $A g^{+}$ and $C u^{2 +}$ are oxidizing agents. In the reaction (c) $A g^{+}$ oxidizes benzaldehyde to benzoate ion. In reaction (d) $C u^{2 +}$ cannot oxidize benzaldehyde. Hence, $A g^{+}$ is a stronger oxidizing agent than $C u^{2 +}$ .