1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Morning Slot

The isotopes of hydrogen are :
A
Tritium and protium only
B
Protium and Deuterium only
C
Protium, deuterium and tritium
D
Deuterium and tritium only

Explanation

Isotopes of hydrogen are
(1)  Protium (1H1)
(2)  Deuterium (1H2)
(3)  Tritium (1H3)
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

The temporary hardness of water is due to :
A
Na2SO4
B
NaCl
C
Ca(HCO3)2
D
CaCl2

Explanation

Ca(HCO3)2 is responsible for temporary hardness of water.
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are :
A
3 and 2
B
2 and 1
C
2 and 0
D
3 and 1

Explanation

Total number of isotopes of hydrogen is 3

$$ \Rightarrow \,\,{}_1^1H,{}_1^2H$$  or  $${}_1^2D,\,{}_1^3H\,\,$$or  $${}_1^3T$$

and only $${}_1^3H$$ or $${}_1^3T$$ is an Radioactive element.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

The chemical nature of hydrogen peroxide is :
A
Oxidising agent in acidic medium, but not in basic medium
B
Oxidising and reducing agent in both acidic and basic medium
C
Reducing agent in basic medium, but not in acidic medium
D
Oxidising and reducing agent in acidic medium, but not in basic medium.

Explanation

H2O2 act as oxidising agent and reducing agent in acidic medium as well as basic medium.

H2O2 Act as oxidant : -

H2O2 + 2H$$^ \oplus $$ + 2e$$-$$ $$ \to $$  2H2O (In acidic medium)

H2O2 + 2e$$-$$ $$ \to $$ 2OH$$-$$ (In basic medium)

H2O2 Act as reductant : -

H2O2 $$ \to $$ 2H+ + O2 + 2e$$-$$ (In acidic medium)

H2O2 + 2OH$$-$$ $$ \to $$ 2H2O + O2 + 2e$$-$$ (In basic medium)

Questions Asked from Hydrogen

On those following papers in MCQ (Single Correct Answer)
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JEE Main 2019 (Online) 9th January Evening Slot (1)
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JEE Main 2019 (Online) 10th January Morning Slot (2)
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