1
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
2
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
$${C_2}O_4^{2 - } \to 2C{O_2}$$
3
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
4
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Statement I : Sodium hydride can be used as an oxidising agent.

Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic.

Choose the CORRECT answer from the options given below :
A
Statement I is false but statement II is true
B
Both statement I and statement II are true
C
Statement I is true but statement II is false
D
Both statement I and statement II are false
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