Hydrogen Test

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Hydrogen Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

The boiling point of water is :

A
$$0^{\circ} C$$

B
$$100^{\circ} C$$

C
$$-0^{\circ} C$$

D
$$-100^{\circ} C$$

Solution

The boiling point of water is $$100^{\circ}C$$.
This is because upto 100$$^{\circ}$$C water can increase it's temperature but after 100$$^{\circ}$$C it starts to change its state(i.e, from liquid to vapour) rather than to increase its temperature. Hence, the boiling point of water is 100$$^{\circ}$$C.
Question 2
1 / -0

$$H_2$$ does not show litmus test. From this, we can say, that the oxide of hydrogen is _______ in nature.

A
acidic

B
neutral

C
basic

D
amphoteric

Solution

$${ H }_{ 2 }$$ does not affect litmus paper as it is neutral. If it would have been acidic then it would have turn blue litmus red or if basic then vice-versa.
Question 3
1 / -0

When water is cooled it contracts until it reaches __________ and then it starts expanding.

A
37$$^{\circ}$$C

B
40$$^{\circ}$$C

C
0$$^{\circ}$$C

D
4$$^{\circ}$$C

Solution

Lowering of a temperature of water reduces the translation motion and thus brings the molecules closer. This is apparent in the contraction of water upon cooling. But at $$4^{ \circ }C$$, the water molecules form extensive hydrogen bonding. As a result, each water molecules is surrounded by four molecules and this increases the vacant space between the molecules. This results in expansion of the system.
option D is correct.
Question 4
1 / -0

Water is a ______ oxide.

A
acidic

B
neutral

C
basic

D
amphoteric

Solution

Water is a neutral oxide because it does not show any change in the colour of litmus paper.
Question 5
1 / -0

Concentration of $$H_{2}O_{2}$$ by vacuum distillation gives hydrogen peroxide which is:

A
about $$99\%$$ pure

B
about $$90\%$$ pure

C
$$30\%$$ pure

D
about $$50\%$$ pure

Solution

Vacuum distillation avoids decomposition of peroxide and gives crystalline $$H_2O_2$$ with negligible amount of impurities.
Question 6
1 / -0

Electronic configuration of deuterium is _________.

A
$$1s^{2}$$

B
$$1s^{1}$$

C
$$1s^{2}2s^{1}$$

D
$$1s^{2}2s^{2}$$

Solution

Hydrogen has one proton and no neutron. Its atomic number is one and the electronic configuration is $$1s^1$$.

Deuterium has one neutron and one proton. The mass number of deuterium is $$2$$. Its electronic configuration is the same as that of hydrogen, $$1s^1$$ as it is an isotope of hydrogen.
Question 7
1 / -0

A majority of farmers in India depend upon _______ for irrigating their crops.

A
rains

B
tube wells

C
hand pumps

D
canals

Solution

The Indian economy is heavily dependent on agriculture and the livelihood of the Indian farmer largely depends on the Monsoon rains for irrigating their crops.

Hence, option A is correct.
Question 8
1 / -0

The melting point of ice on Kelvin scale is:

A
0 K

B
-273 K

C
273 K

D
373 K

Solution

The temperature of the reverse change from liquid to solid is called the freezing point or crystallization point. For most substances the melting point and freezing points are equal.
For ice, the melting point is 273K
Thus Option C is correct.
Question 9
1 / -0

Which of the following is NOT soluble in water?

A
Salt

B
Sugar

C
Oxygen

D
Sand

Solution

Salt is an ionic compound that is formed by a cation and anion. The ionic species have dipole-dipole attraction with water molecules and are therefore soluble.
Sugar is a polyhydroxy compounds. The hydrogen bonding between water and $$OH$$ groups makes sugar soluble.
Oxygen is water soluble gas as being small molecule, gets trapped in water molecules and is utilized by water organisms for sustenance.
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. It forms a dispersion with water and settles down with time. It is insoluble in water.
Option D is correct
Question 10
1 / -0

Water is a kind of _____oxide.

A
acidic

B
basic

C
neutral

D
metal

Solution

Water is a neutral oxide.
Neutral oxides are oxides which are neither acidic nor basic.

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 14

Result

Hydrogen Test - 14

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Question 1

$$0^{\circ} C$$

$$100^{\circ} C$$

$$-0^{\circ} C$$

$$-100^{\circ} C$$

Solution

Question 2

acidic

neutral

basic

amphoteric

Solution

Question 3

37$$^{\circ}$$C

40$$^{\circ}$$C

0$$^{\circ}$$C

4$$^{\circ}$$C

Solution

Question 4

acidic

neutral

basic

amphoteric

Solution

Question 5

about $$99\%$$ pure

about $$90\%$$ pure

$$30\%$$ pure

about $$50\%$$ pure

Solution

Question 6

$$1s^{2}$$

$$1s^{1}$$

$$1s^{2}2s^{1}$$

$$1s^{2}2s^{2}$$

Solution

Question 7

rains

tube wells

hand pumps

canals

Solution

Question 8

0 K

-273 K

273 K

373 K

Solution

Question 9

Salt

Sugar

Oxygen

Sand

Solution

Question 10

acidic

basic

neutral

metal

Solution

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