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Valency factor $\left({\mathrm{V}}_t\right)$ for following redox reaction is respectively.
a. ${\mathrm{As}}_2{\mathrm{S}}_3 \to {\mathrm{AsO}}_4^{-3}+{\mathrm{SO}}_4^{2-}$
b. ${\mathrm{I}}_2 \to {\mathrm{I}}^{-}+{\mathrm{IO}}_3^{-}$
c. ${\mathrm{H}}_3{\mathrm{PO}}_2 \to {\mathrm{PH}}_3+{\mathrm{H}}_3{\mathrm{PO}}_3$
1. $28, \frac{5}{3},\frac{4}{3}$
2. $28,\frac{4}{3},\frac{5}{3}$
3. $6, 4, 7$
4. 4, 3, 9

The oxidation number of S in ${\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6$ is:
1. +2.5
2. +2 and +3 (two S have +2 other two have +3)
3. +2 and +3 (three S have +2 and one S has +3)
4. +5 and 0 (two S have +5 and the other two S have 0)

The oxidation number of phosphorus in Ba(H₂PO₂)₂ is:
1. +3
2. +2
3. +1
4. -1

The oxidation number of Cl in ${\mathrm{CaOCl}}_2$ is
1. Zero
2. -1
3. +1
4. -1 as well as +1

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 reduction
4. Neither oxidation nor reduction

Which acts as reducing agent only?
1. ${\mathrm{SO}}_2$
2. ${\mathrm{H}}_2{\mathrm{SO}}_4$
3. ${\mathrm{H}}_2\mathrm{S}$
4. ${\mathrm{HNO}}_2$

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

A, B and C are three elements forming a part of compound in oxidation states of +2, +5 and -2 respectively. What could be the compounds?
1. ${\mathrm{A}}_2{\left(\mathrm{BC}\right)}_2$
2. ${\mathrm{A}}_2{(\mathrm{BC}}_{}$₄)3
3. ${\mathrm{A}}_3{(\mathrm{BC}}_{}$₄)2
4. ABC

For the reaction, ${\mathrm{MnO}}_4^{2-}\to {\mathrm{MnO}}_4^{-}+{\mathrm{MnO}}_2$. How many moles of ${\mathrm{MnO}}_4^{-}$ and ${\mathrm{MnO}}_2$ are obtained after the disproportionation of one mole of ${\mathrm{MnO}}_4^{2-}$ respectively?
1. $\frac{2}{3} and \frac{1}{3}$
2. $\frac{1}{3} and \frac{2}{3}$
3. $\frac{1}{2} and \frac{1}{2}$
4. 2 and 1

How many moles of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ are required to oxidise one mole of ${\mathrm{FeSO}}_4$ in acidic medium?
1. 6
2. 1/2
3. $\frac{1}{3}$
4. $\frac{1}{6}$

${\mathrm{KMnO}}_4$ is strong oxidixing agent in acidic medium. To provide acidic medium, ${\mathrm{H}}_2{\mathrm{SO}}_4$ is used instead of HCl. This is because
1. ${\mathrm{H}}_2{\mathrm{SO}}_4$ is stronger acid than HCl 
2. HCl is oxidised by ${\mathrm{KMnO}}_4 \mathrm{to} {\mathrm{Cl}}_2$
3. ${\mathrm{H}}_2{\mathrm{SO}}_4$ is dibasic acid
4. Rate is faster in the presence of ${\mathrm{H}}_2{\mathrm{SO}}_4$

The stoichiometric coefficient of S in the following reaction
${\mathrm{H}}_2\mathrm{S}+{\mathrm{HNO}}_3 \to \mathrm{NO}+\mathrm{S}+{\mathrm{H}}_2\mathrm{O}$ is balanced (In acidic medium)
1. 1
2. 2
3. 3
4. 4

Consider the following reaction:
 ${\mathrm{xMnO}}_4^{-} + {\mathrm{yC}}_2{\mathrm{O}}_4^{2-}+{\mathrm{zH}}^{+}\to {\mathrm{xMn}}^{2+}+2{\mathrm{yCO}}_2+\frac{\mathrm{z}}{2}{\mathrm{H}}_2\mathrm{O}$
The values of x, y and z in the reaction are respectively:
1. 2, 5 and 16
2. 5, 2 and 8
3. 5, 2 and 16
4. 2, 5 and 8

In which reaction: ${\mathrm{H}}_2{\mathrm{O}}_2$ acts as reducing agent?
1. ${\mathrm{Ag}}_2\mathrm{O}+{\mathrm{H}}_2{\mathrm{O}}_2 \to 2\mathrm{Ag}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$
2. $2\mathrm{Kl}+{\mathrm{H}}_2{\mathrm{O}}_{2 }\to 2\mathrm{KOH}+{\mathrm{I}}_2$
3. $\mathrm{PbS}+4{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{PbSO}}_4+4{\mathrm{H}}_2\mathrm{O}$
4. ${\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{SO}}_2\to {\mathrm{H}}_2{\mathrm{SO}}_4$

The oxidation state of Cr in [Cr(NH₃)₄Cl₂]⁺ is:
1. +3
2. +2
3. +1
4. 0