Hydrogen CBSE Questions & Answers

Hydrogen

This is Chemistry Class 11 Hydrogen CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

One of the following reaction is used to increase the yield of dihydrogen obtained from the coal gasification reaction.

A
\({\text{CH4 }} + {{\text{H}}_{\text{2}}}{\text{O}} \to {\text{ CO}} + {\text{ H2}}\)
B
\({{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} + {\text{ 2HI }} \to {\text{ }}{{\text{I}}_{\text{2}}} + {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O}}\)
C
\({\text{CO }}\left( {\text{g}} \right){\text{ }} + {\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\left( {\text{g}} \right){\text{ }} \to {\text{ C}}{{\text{O}}_{\text{2}}} + {\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\)
D
\({\text{C}}\left( {\text{s}} \right){\text{ }} + {\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\left( {\text{g}} \right){\text{ }} \to {\text{ CO }}\left( {\text{g}} \right){\text{ }} + {\text{ }}{{\text{H}}_{\text{2}}}\left( {\text{g}} \right)\)
Correct

self-ionization) of water is called

A
auto-protolysis
Correct
B
water-gas shift reaction
C
Redox Reactions
D
Hydrolysis Reaction:

When sodium peroxide is treated with dilute sulphuric acid, we get ______.

A
sodium sulphate and water
B
sodium sulphate and hydrogen peroxide
Correct
C
sodium sulphate, hydrogen and oxygen
D
sodium sulphate and oxygen

Hydrogen peroxide is obtained by the electrolysis of ______.

A
water
B
hydrochloric acid
C
fused sodium peroxide
D
sulphuric acid
Correct

Elements of which of the following group(s) of periodic table do not form hydrides.

A
Groups 7, 8, 9
Correct
B
Group 13
C
roup 14
D
Groups 15, 16, 17

Only one element of ________ forms hydride.

A
roup 9
B
group 6
Correct
C
group 8
D
group 7

Which of the following equations depict the oxidising nature of H2O2?

A
\({\text{2Fe}}{{\text{3}}^ + } + {\text{2H}} + {\text{ }} + {{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{2F}}{{\text{e}}^{{\text{2}} + }} + {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O}} + {{\text{O}}_{\text{2}}}\)
B
\({\text{2MnO4}} - {\text{ }} + {\text{ 6 }}{{\text{H}}^ + } + {\text{5}}{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{2M}}{{\text{n}}^{{\text{2}} + }} + {\text{8}}{{\text{H}}_{\text{2}}}{\text{O}} + {\text{5}}{{\text{O}}_{\text{2}}}\)
C
\({\text{2}}{{\text{I}}^ - } + {\text{2}}{{\text{H}}^ + } + {{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {{\text{I}}_{\text{2}}} + {\text{2}}{{\text{H}}_{\text{2}}}{\text{O}}\)
Correct
D
\({\text{KI}}{{\text{O}}_{\text{4}}} + {{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{ KI}}{{\text{O}}_{\text{3}}} + {{\text{H}}_{\text{2}}}{\text{O}} + {{\text{O}}_{\text{2}}}\)

Which of the following equation depicts reducing nature of \({{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\)?

A
\({\text{2}}{\left[ {{\text{Fe}}{{\left( {{\text{CN}}} \right)}_{\text{6}}}} \right]^{{\text{4}} - }} + {\text{ 2}}{{\text{H}}^ + } + {{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{ 2}}{\left[ {{\text{Fe}}{{\left( {{\text{CN}}} \right)}_{\text{6}}}} \right]^{{\text{3}} - }} + {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O}}\)
B
\({{\text{I}}_{\text{2}}} + {{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} + {\text{ 2O}}{{\text{H}}^ - } \to {\text{ 2}}{{\text{I}}^ - } + {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O}} + {{\text{O}}_{\text{2}}}\)
Correct
C
\({\text{PbS }} + {\text{ 4}}{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{ PbS}}{{\text{O}}_{\text{4}}} + {\text{ 4}}{{\text{H}}_{\text{2}}}{\text{O}}\)
D
\({\text{M}}{{\text{n}}^{{\text{2}} + }} + {{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{ M}}{{\text{n}}^{{\text{4}} + }} + {\text{ 2O}}{{\text{H}}^ - }\)

\({{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\)behaves as a bleaching agent because:

A
acts as a strong reducing agent in acidic media
B
acts as a strong reducing agent in basic media
C
it absorbs the visible light
D
it breaks the chemical bonds of the chromophores
Correct

Which of the following statements are not true for hydrogen?

A
It exists as diatomic molecule.
B
It has one electron in the outermost shell.
C
It can lose an electron to form a cation which can freely exist
Correct
D
It forms a large number of ionic compounds by losing two electrons.

Dihydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and \({{\text{H}}_{\text{2}}}\) gas is formed. It is known as ____________.

A
Water gas
Correct
B
Producer gas
C
starter gas
D
Industrial gas

Which of the following statement(s) is/are correct in the case of heavy water?

A
Heavy water is more unassociated than ordinary water.
B
Heavy water is used as a moderator in nuclear reactor.
Correct
C
Heavy water is more effective as solvent than ordinary water.
D
Heavy water has lower boiling point than ordinary water.

Which of the following statements about hydrogen are correct?

A
Hydrogen ion, \({{\text{H}}^ + }\), exists freely in solution.
B
Hydrogen never acts as anion in ionic salts.
C
Dihydrogen does not act as a reducing agent.
D
Hydrogen has three isotopes of which protium is the most common.
Correct

Some of the properties of water are described below. Which of them is/are not correct?

A
Frozen water is lighter than liquid water.
B
Water is known to be a universal solvent
C
Hydrogen bonding is present to a large extent in liquid water.
D
There is no hydrogen bonding in the frozen state of water.
Correct

Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of

A
Chlorides of Ca and Mg in water
Correct
B
Hydrogen carbonates of Ca and Mg in water
C
Carbonates of alkali metals in water
D
Carbonates of Ca and Mg in water