1
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
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Which one of the following is an example of disproportionation reaction ?

A
$$3MnO_4^{2 - } + 4{H^ + } \to 2MnO_4^ - + Mn{O_2} + 2{H_2}O$$
B
$$MnO_4^ - + 4{H^ + } + 4{e^ - } \to Mn{O_2} + 2{H_2}O$$
C
$$10{I^ - } + 2MnO_4^ - + 16{H^ + } \to 2M{n^{2 + }} + 8{H_2}O + 5{I_2}$$
D
$$8MnO_4^ - + 3{S_2}O_3^{2 - } + {H_2}O \to 8Mn{O_2} + 6SO_4^{2 - } + 2O{H^ - }$$
2
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
The oxidation states of 'P' in H4P2O7, H4P2O5 and H4P2O6, respectively, are :
A
7, 5 and 6
B
5, 4 and 3
C
5, 3 and 4
D
6, 4 and 5
3
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Identify the process in which change in the oxidation state is five :
A
$$C{r_2}O_7^{2 - } \to 2C{r^{3 + }}$$
B
$$MnO_4^ - \to M{n^{2 + }}$$
C
$$CrO_4^{2 - } \to C{r^{3 + }}$$
D
$${C_2}O_4^{2 - } \to 2C{O_2}$$
4
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The oxidation states of nitrogen in NO, NO2, N2O and NO$$_3^ - $$ are in the order of :
A
N2O > NO2 > NO > NO$$_3^ - $$
B
NO > NO2 > N2O > NO$$_3^ - $$
C
NO2 > NO$$_3^ - $$ > NO > N2O
D
NO$$_3^ - $$ > NO2 > NO > N2O
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