Hydrogen MCQ Questions & Answers in Inorganic Chemistry | Chemistry
Learn Hydrogen MCQ questions & answers in Inorganic Chemistry are available for students perparing for IIT-JEE, NEET, Engineering and Medical Enternace exam.
51.
Which one of the following statements about water is FALSE?
A
There is extensive intramolecular hydrogen bonding in the condensed phase.
B
Ice formed by heavy water sinks in normal water.
C
Water is oxidized to oxygen during photosynthesis.
D
Water can act both as an acid and as a base.
Answer :
There is extensive intramolecular hydrogen bonding in the condensed phase.
There is extensive intermolecular hydrogen bonding in the condensed phase instead of intramolecular $$H \operatorname{-bonding} $$
52.
The percentage by weight of hydrogen in $${H_2}{O_2}$$ is
A
4.88%
B
3.6%
C
5.88%
D
2%
Answer :
5.88%
Molecular mass of $${H_2}{O_2} = \left( {1 \times 2} \right) + \left( {2 \times 16} \right) = 34$$
% of hydrogen $$ = \frac{2}{{34}} \times 100 = 5.88\% $$
53.
What is meant by demineralised water?
A
Water free from cations and anions.
B
Water free from minerals dissolved in it.
C
Water free from impurities.
D
Water free from $$N{a^ + }$$ and $${K^ + }$$ ions.
Answer :
Water free from cations and anions.
Water free from cations $$\left( {C{a^{2 + }},M{g^{2 + }},{\text{etc}}.} \right)$$ and anions $$\left( {C{l^ - },SO_4^{2 - },HCO_3^ - ,{\text{etc}}.} \right)$$ is called deionised or demineralised water.
54.
Which of the following is not a disadvantage of using hard water?
A
In production of steam in boilers
B
Formation of scales in cooking utensils
C
In cooking, bathing and washing
D
In ion exchangers
Answer :
In ion exchangers
In an ion exchanger using hard water is not a disadvantage since it becomes soft by exchanging anions or cations.
55.
$${H_2}{O_2}$$ acts as a bleaching agent because of
A
reducing nature of $${H_2}{O_2}$$
B
oxidising nature of $${H_2}{O_2}$$
C
acidic nature of $${H_2}{O_2}$$
D
basic nature of $${H_2}{O_2}$$
Answer :
oxidising nature of $${H_2}{O_2}$$
Due to oxidising nature of $${H_2}{O_2},$$ it acts as a bleaching agent.
56.
Which of the following hydrides is electron - precise hydride?
A
$${B_2}{H_6}$$
B
$$N{H_3}$$
C
$${H_2}O$$
D
$$C{H_4}$$
Answer :
$$C{H_4}$$
Elements of group 14 form electron - precise ( having required number of electrons to write the Lewis structure ) hydrides.
57.
Which of the following statements is correct regarding hydrogen?
A
Hydrogen shows + 1 and - 1 oxidation states.
B
Hydrogen is never liberated at anode.
C
Hydrogen has same ionisation enthalpy as that of alkali metals.
D
Hydrogen has same electronegativity as that of halogens.
Answer :
Hydrogen shows + 1 and - 1 oxidation states.
Hydrogen has + 1 oxidation state in compounds with more electronegative elements e.g., $$HF.$$ It has - 1 oxidation state in compounds with more electropositive elements e.g., $$NaH.$$
58.
Hydrogen gas will not reduce :
A
heated cupric oxide
B
heated ferric oxide
C
heated stannic oxide
D
heated aluminium oxide
Answer :
heated aluminium oxide
NOTE: The more electropositive metal will not be reduced by hydrogen.
Among given choices only $$Al$$ is more electropositive than hydrogen.
∴ It will not be reduced by hydrogen.
59.
Which gas is produced when calcium nitride $$\left( {C{a_3}{N_2}} \right)$$ is hydrolysed by water?
A
$${N_2}$$
B
$$N{H_3}$$
C
$${H_2}$$
D
$${O_2}$$
Answer :
$$N{H_3}$$
$$C{a_3}{N_{2\left( s \right)}} + 6{H_2}{O_{\left( l \right)}} \to $$ $$3Ca{\left( {OH} \right)_{2\left( {aq} \right)}} + 2N{H_{3\left( g \right)}}$$
60.
Given below are the elements and the type of hydrides formed by them. Mark the incorrect match.