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In the conversion, ${\mathrm{H}}_2{\mathrm{SO}}_4 \to {\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$ which process occurs?
1.  Oxidation
2.  Reduction
3.  Oxidation as well as a reduction
4.  Neither oxidation nor reduction 

In the reaction, 
$2 C{u}^{+}\to$C$u+C{u}^{2+},$ the equivalent weight of $C{u}^{+}$is (M is the mol. wt. of $C{u}^{+}$)
1. M 
2. $\frac{M}{2}$
3.$\frac{M}{4}$
4. 2M

In which reaction: $H_2{O}_2 acts as reducing agent?$
1. $A{g}_{2}O+H_2{O}_2\to 2Ag+H_{2}O+O_2$
2. $2KI+ H_2{O}_2\to 2KOH + I_2$
3. $Pbs+4 H_2{O}_2\to Pbs{O}_4+4H_{2}O$
4.$H_2{O}_2+S{O}_2\to H_{2}S{O}_4$

In the equation, 
$N{O}_2^{-}+H_{2}O\to {\mathrm{NO}}_3^{-}+2H^{+} +n{e}^{-}$, n stands for: 
1. 1
2. 2
3. 3
4. 4

Which of the following is a redox reaction : 
1. $NaCl + KN{O}_3\to NaN{O}_3+ KCl$
$$
2. $Ca{C}_2{O}_{4 }+ 2HCl \to CaC{l}_2 + H_2{C}_2 O_4$
3. $Mg{\left(OH\right)}_2 + 2N{H}_{4}Cl \to MgC{l}_2 + 2N{H}_{4}OH$
4. $Zn+ 2AgCN \to 2Ag+Zn{\left(CN\right)}_2$

Which substance serves as a reducing agent in the following reaction, $14{\mathrm{H}}^{+} + {\mathrm{Cr}}_2{\mathrm{O}}_7^{2-} + 3\mathrm{Ni} \to 2{\mathrm{Cr}}^{3+} + 7{\mathrm{H}}_2\mathrm{O} + 3{\mathrm{Ni}}^{2+}$?
1. ${\mathrm{H}}_2\mathrm{O}$
2. Ni
3. ${\mathrm{H}}^{+}$
4. ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$

In which of the following compounds, the oxidation number of iodine is fractional?
1. ${\mathrm{IF}}_7$
2. ${\mathrm{I}}_3^{-}$
3. ${\mathrm{IF}}_5$
4. ${\mathrm{IF}}_3$

The equivalent weight of a metal is 4.5 and the molecular weight of its chloride is 80. The atomic weight of the metal is:-
1. 18
2. 9
3. 4.5
4. 36

In the reaction:
Al + Fe₃O₄  → Al₂O₃ + Fe
How many electrons are transferred in total during the reaction?
1. 6
2. 8
3. 8/3
4. 24

25.0 g of FeSO₄.7H₂O was dissolved in water containing dilute H₂SO₄, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO₄ solution for complete oxidation. The percentage of FeSO₄^. 7H₂O in the acid solution is
(1) 78%
(2) 98%
(3) 89%
(4) 79%

Equivalent mass of FeS₂ in the half reaction, ${\mathrm{FeS}}_2\to {\mathrm{Fe}}_2{\mathrm{O}}_3+{\mathrm{SO}}_2$ is :
1. M/10
2. M/11
3. M/6
4. M/1

The equivalent mass of HCl in the given reaction is :
${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+14 \mathrm{HCl}\to 2\mathrm{KCl}+2{\mathrm{CrCl}}_3+3{\mathrm{Cl}}_2+{\mathrm{H}}_2\mathrm{O}$
1. 16.25
2. 36.5
3. 73
4. 85.1

$6\times {10}^{-3}$ mole ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ reacts completely with $9\times {10}^{-3}$ mole ${\mathrm{X}}^{\mathrm{n}+}$ to give ${\mathrm{XO}}_3^{-}$ and ${\mathrm{Cr}}^{3+}$. The value of n is :
1. 1
2. 2
3. 3
4. None of these

What mass of ${\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4.2{\mathrm{H}}_2\mathrm{O}$ (mol. mass = 126) should be dissolved in water to prepare 250 mL of centinormal solution which act as a reducing agent ?
1. 0.63 g
2. 0.1575 g
3. 0.126 g
4. 0.875 g