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1
JEE Main 2022 (Online) 25th July Evening Shift
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High purity (> 99.95%) dihydrogen is obtained by :

A
reaction of zinc with aqueous alkali.
B
electrolysis of acidified water using platinum electrodes.
C
electrolysis of warm aqueous barium hydroxide solution between nickel electrodes.
D
reaction of zinc with dilute acid.
2
JEE Main 2022 (Online) 25th July Morning Shift
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The reaction of $$\mathrm{H}_{2} \mathrm{O}_{2}$$ with potassium permanganate in acidic medium leads to the formation of mainly :

A
Mn2+
B
Mn4+
C
Mn3+
D
Mn6+
3
JEE Main 2022 (Online) 29th June Morning Shift
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Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

A
HOCl + H2O2 $$\to$$ H3O+ + Cl$$-$$ + O2
B
PbS + 4H2O2 $$\to$$ PbSO4 + 4H2O
C
2MnO$$_4^ - $$ + 3H2O2 $$\to$$ 2MnO2 + 3O2 + 2H2O + 2OH$$-$$
D
Mn2+ + H2O2 $$\to$$ Mn4+ + 2OH$$-$$
4
JEE Main 2022 (Online) 28th June Evening Shift
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Hydrogen has three isotopes : protium (1H), deuterium (2H or D) and tritium (3H or T). They have nearly same chemical properties but different physical properties. They differ in :

A
number of protons.
B
atomic number.
C
electronic configuration.
D
atomic mass.
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