Identify the substance oxidised, reduced, ...

NCERT Class XI Chemistry Redox Reactions Solutions

Question : 13 of 30

Marks: +1, -0

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

(a)

2\mathrm{AgBr}_{(s)} + \mathrm{C_6H_6O_2}_{(aq)}

→

2\mathrm{Ag}_{(s)} + 2\mathrm{HBr}_{(aq)} + \mathrm{C_6H_4O_2}_{(aq)}

(b)

\mathrm{HCHO}_{(l)} + 2[\mathrm{Ag}(\mathrm{NH}_3)_2]^{+}_{(aq)} + 3\mathrm{OH}^{-}_{(aq)}

→

2\mathrm{Ag}_{(s)} + \mathrm{HCOO}^{-}_{(aq)} + 4\mathrm{NH_3}_{(aq)} + 2\mathrm{H_2O}_{(l)}

(c)

\mathrm{HCHO}_{(l)} + 2\mathrm{Cu}^{2+}_{(aq)} + 5\mathrm{OH}^{-}_{(aq)}

→

\mathrm{Cu_2O}_{(s)} + \mathrm{HCOO}^{-}_{(aq)} + 3\mathrm{H_2O}_{(l)}

(d)

\mathrm{N_2H_4}_{(l)} + 2\mathrm{H_2O_2}_{(l)}

→

\mathrm{N_2}_{(g)} + 4\mathrm{H_2O}_{(l)}

(e)

\mathrm{Pb}_{(s)} + \mathrm{PbO_2}_{(s)} + 2\mathrm{H_2SO_4}_{(aq)}

→

2\mathrm{PbSO_4}_{(s)} + 2\mathrm{H_2O}_{(l)}

Solution:

Reducing agent (Substance oxidised)	Oxidising agent (Substance reduced)
(a) $\mathrm{C_6H_6O_2}_{(g)}$	$\mathrm{AgBr}_{(s)}$
(b) $\mathrm{HCHO}_{(l)}$	$[\mathrm{Ag}(\mathrm{NH}_3)_2]^{+}_{(aq)}$
(c) $\mathrm{HCHO}_{(l)}$	$\mathrm{Cu}^{2+}_{(aq)}$
(d) $\mathrm{N_2H_4}_{(l)}$	$\mathrm{H_2O_2}_{(l)}$
(e) $\mathrm{Pb}_{(s)}$	$\mathrm{PbO_2}_{(s)}$

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