Which of the following pair is having different oxidation number of central atom?

(1) $K_{2}Cr{O}_4$ ,$K_{2}C{r}_2{O}_7$

(2) $H_{2}S{O}_4, H_{2}S{O}_5$

(3) $N{H}_3, N_{3}H$

(4) All of these

Which of the following is not a disproportionation reaction?

(1) $H_2{S}_2{O}_8\to H_{2}S{O}_4+O_2$

(2) $P_4\stackrel{H_{2}O}{\to }P{H}_3+H_{3}P{O}_4$

(3) $H_{2}S{O}_5\to H_{2}S{O}_4+\frac{1}{2}{O}_2$

(4) $S_8+H_{2}O\to H_{2}S+\frac{1}{2}{O}_2$

Oxidation state of 'P' in $Ba\left(HP{O}_3\right)$ is

(1) +1

(2) +2

(3) +3

(4) +4

 $In<mspace\; width="1em"></mspace>a<mspace\; width="1em"></mspace>KMn{O}_4+bFeS{O}_4+c{H}_{2}S{O}_4$
$\to dF{e}_2{\left(S{O}_4\right)}_3+e{K}_{2}S{O}_4+fMnS{O}_4+g{H}_{2}O,$
$Correct<mspace\; width="1em"></mspace>relation<mspace\; width="1em"></mspace>is$

(1) (a+e+f) = d

(2) c = g = d + e + f

(3) b = a + d + e + f

(4) All of these 

Oxidation states of C in Toluene is/are

(1) -3

(2) -1

(3) 0

(4) All of these

Highest oxidation number of nitrogen is in

(1) Nitrobenzene

(2) Nitric acid

(3) $N{O}_2$

(4) Both (2) & (3) 

Oxidation state of titanium in pervoskite is

(1) +2

(2) +3

(3) +4

(4) +5

For the reaction $2H_{3}P{O}_2\to H_{3}P{O}_4+P{H}_3$, the equivalent mass of $H_{3}P{O}_2$ is

(1) $\frac{M}{4}$

(2) $\frac{M}{3}$

(3) $\frac{M}{2}$

(4) M

The oxidation number of S in product after the reaction of $N{a}_2{S}_2{O}_3<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>I_2$ in acidic medium is

(1) +2

(2) +2 and +3

(3) 0 and +5

(4) +6

In the reaction, $2C{u}^{+}\to Cu+C{u}^{2+}$.

The equivalent weight of $C{u}^{+}$ is (Ionic weight of $C{u}^{+}$= M)

(1) $\frac{M}{2}$

(2) M

(3) 2M

(4) $\frac{M}{3}$