Hydrogen(11th And 12th > Chemistry ) Questions and answers for exam Preparation

11th And 12th > Chemistry

HYDROGEN MCQs

Total Questions : 30 | Page 1 of 3 pages

Question 1.

Choose the hydrate which exhibit Hydrogen bonding.

${C u S O}_{4}$ .5 $H_{2}$ O
${B a C l}_{2}$ .2 $H_{2}$ O
${C r C l}_{2}$ .6 $H_{2}$ O
All of the above

Discuss Question

Answer: Option A. ->

{C u S O}_{4}

H_{2}

O
:
A

In ${C u S O}_{4}$ .5 $H_{2}$ O, one molecule of wateris hydrogen bonded with ${C u S O}_{4}$ .

Question 2.

The species that does not contain peroxide ion is

$P b O_{2}$
$H_{2} O_{2}$
$S r O_{2}$
$B a O_{2}$

Discuss Question

Answer: Option A. ->

P b O_{2}

:
A

P b O_{2}

is not a peroxide

Question 3.

Which of the following metals cannot liberate hydrogen from dilute HCl?

Discuss Question

Answer: Option D. -> Cu
:
D
As its standard reduction potential is high

Question 4.

Which of the following has high melting point?

$H_{2}$
$D_{2}$
$T_{2}$
Both A and B

Discuss Question

Answer: Option C. ->

T_{2}

:
C
As atomic mass is more.

Question 5.

Which of the following reasons cause the limited use of H₂as a fuel?
I) Its calorific value is low.
II) Its availability in free state is less.
III) It is difficult to store.
IV) It is not a clean fuel.

II and III
II, III and IV
I and III
I, II and III

Discuss Question

Answer: Option A. -> II and III
:
A

As a fuel, hydrogen is very difficult to store. It is extremely reactive and it combines with most of the metals and non-metals forming stable compounds. Thus it is not available in the free state.
On the other hand, the calorific value of $H_{2}$ is very high - $150 K J / g$ , and so can be very useful as a fuel.
Similarly, it is an extremely clean fuel that releases only water upon combustion. Thus, cleanliness doesn't hinder its usefullness either.

Question 6.

Among two solvents $H_{2} O a n d D_{2} O$ , pick up correct relation/statement

$H_{2}$ O : High dielectric constant, low molar mass
$D_{2}$ O: High dielectric constant, high molar mass
Both have same dielectric constant
$D_{2}$ O: Low dielectric constant, high molar mass

Discuss Question

Answer: Option A. ->

H_{2}

O : High dielectric constant, low molar mass
:
A
Dielectric constant of water is higher, whereas its molar mass is 18 and lower than the molar mass of

D_{2}

Question 7.

Which of the following hydride does NOT follow the Law of definite proportions?

$N a H$
$P d H$
$C a H_{2}$
$L i H$

Discuss Question

Answer: Option B. ->

P d H

:
B
Interstitial hydride

Question 8.

The critical temperature of water is higher than that of $O_{2}$ because $H_{2} O$ molecule has

Fewer electrons than oxygen
Two covalent bonds
V-shape
Dipole moment

Discuss Question

Answer: Option D. -> Dipole moment
:
D

Critical temperature of water is more than $O_{2}$ due to its dipole moment

(Dipole moment of water = 1.84 D; Dipole moment of $O_{2}$ =zero D).

Question 9.

Protium differs from deuterium in

Electronic configuration
Chemical properties
Bond length
Nuclear radius

Discuss Question

Answer: Option D. -> Nuclear radius
:
D
The number of neutrons differ hence the nuclear radius

Question 10.

$D_{2} O$ is used more in

Chemical industry
Nuclear reactor
Pharmaceutical preparations
Insecticide preparation

Discuss Question

Answer: Option B. -> Nuclear reactor
:
B
Heavy water is used in nuclear reactors to slow down fast moving neutrons and hence ensures that a certain minimum number of radioactive fission reactions can take place.