1
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
The redox reaction among the following is :
A
reaction of H2SO4 with NaOH.
B
formation of ozone form atmosphere oxygen in the presence of sunlight.
C
combination of dinitrogen with dioxygen at 2000 K
D
reaction of [Co(H2O)6]Cl3 With AgNO3
2
JEE Main 2020 (Online) 7th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Oxidation number of potassium in K2O. K2O2 and KO2 respectively is :
A
+1, +2 and + 4
B
+1, +1 and + 1
C
+2, +1 and $$ + {1 \over 2}$$
D
+1, +4, and +2
3
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
An example of a disproportionation reaction is :
A
2NaBr + Cl2 $$ \to $$ 2NaCl + Br2
B
2KMnO4 $$ \to $$ 2KMnO4 + MnO2 + O2 (3) (4)
C
2CuBr $$ \to $$ CuBr2 + Cu
D
2MnO4 + 10Iā€“ + 16H+ $$ \to $$ 2Mn2+ + 5I2 + 8H2O
4
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The correct order of the oxidation states of nitrogen in NO, N2O, NO2 and N2O3 is :
A
NO2 < NO < N2O3 < N2O
B
NO2 < N2O3 < NO < N2O
C
N2O < NO < N2O3 < NO2
D
N2O < N2O3 < NO < NO2
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