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1
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
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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$$-$$
2
JEE Main 2022 (Online) 28th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
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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.
3
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
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Dihydrogen reacts with CuO to give

A
CuH2
B
Cu
C
Cu2O
D
Cu(OH)2
4
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
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Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

A
CaCO3 and Mg(OH)2
B
CaCO3 and MgCO3
C
Ca(OH)2 and MgCO3
D
Ca(OH)2 and Mg(OH)2
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