Hydrogen Test

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Hydrogen Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

Which property of water is used while washing clothes?

A
Odour

B
Colour

C
Solubility

D
Sand

Solution

Water is a good solvent. It combine with dirt and other particles with it when treated with soap, which is water soluble and form lather in water. Hence due to its solubility it is used while washing clothes.
Question 2
1 / -0

Statement I: Water has a higher boiling point than expected.
Statement II: Each molecule forms a hydrogen bond with an adjacent molecule.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

B
Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

C
Statement I is correct, but Statement II is incorrect.

D
Statement I is incorrect, but Statement II is correct.

Solution

Option A is the correct answer.
Water molecule contains a highly electronegative Oxygen atom in it. Thus water molecules are engaged in extensive intermolecular hydrogen bonding with their nearest water molecules. And thus a bulky molecule is formed.
High amount of energy is required to dissociate these bonds and hence water molecules have a higher boiling point than expected.
Question 3
1 / -0

Statement 1: Water boils below $${100}^{o}C$$ at high altitudes.
Statement 2: Atmospheric pressure varies inversely with altitude.

A
Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1

B
Both the Statement 1 and Statement 2 are correct and Statement 2 is NOT the correct explanation of Statement 1.

C
Statement 1 is correct but Statement 2 is not correct.

D
Statement 1 is not correct but Statement 2 is correct.

E
Both the Statement 1 and Statement 2 are not correct.

Solution

Pressure changes inversely with altitudes and boiling point directly proportional to pressure. Pressure and boiling points are low at high altitudes. So water boils below 100$$ ^{\circ}C $$.
Question 4
1 / -0

Liquids with lower boiling point are more :

A
viscous

B
volatile

C
non-volatile

D
none of these

Solution

The higher the vapor pressure of a liquid at a given temperature, the higher the volatility and the lower the normal boiling point of the liquid. Hence liquids with lower boiling point are more volatile.
Question 5
1 / -0

Statement $$1$$: Water boils at a higher temperature on the moon.
Statement $$2$$: The atmospheric pressure of the moon is less than that on earth.

A
Both Statement $$1$$ and Statement $$2$$ are correct and Statement 2 is the correct explanation of Statement $$1$$

B
Both Statement $$1$$ and Statement $$2$$ are correct, but Statement $$2$$ is NOT the correct explanation of Statement $$1$$

C
Statement $$1$$ is correct, but Statement $$2$$ is not correct

D
Statement $$1$$ is not correct, but Statement $$2$$ is correct

Solution

Pressure is directly proportional to boiling point. On moon, there is less atmospheric pressure and because of this boiling point increases. So water boils at high temperature on the moon.
Question 6
1 / -0

Which of the following is NOT soluble in water?

A
Salt

B
Sugar

C
Oxygen

D
Sand

Solution

Sand $$(SiO_2)$$ is not soluble in water.
Question 7
1 / -0

Balance the chemical reaction of laboratory preparation method of dihydrogen:

A
$$Zn + 2H^+ \ \longrightarrow Zn^{2+} +\ H_2$$

B
$$Zn^{2+} + 2H^- \ \longrightarrow Zn +\ H_2$$

C
$$Zn^{2+} + 2H^+ \ \longrightarrow Zn^{2+} +\ H_2$$

D
None of the above

Solution

Hydrogen is prepared in the laboratory by the action of acids on metals. Dilute sulphuric acid containing 1 volume of concentrated acid to 5 volumes of water, or dilute hydrochloric acid containing 1 volume of concentrated acid to 4 volumes of water, is added to granulated zinc. Zinc sulphate or zinc chloride is formed in solution and the hydrogen that is evolved is collected over water in a trough.
$$Zn+2{ H }^{ + }⟶{ Zn }^{ 2+ }+{ H }_{ 2 }$$
Question 8
1 / -0

When steam is passed over red hot iron we get which of the following products?

A
Ferric hydroxide and hydrogen

B
Ferric oxide and hydrogen

C
Ferrous hydroxide and hydrogen

D
Ferrous oxide and hydrogen

Solution

When steam is passed over red hot iron, ferric oxide and hydrogen is formed.

$$3Fe+4H_2O\longrightarrow Fe_3O_4+4H_2$$
ferric Dihydrogen
oxide

The iron is oxidized to ferric oxide whereas the water is reduced to hydrogen.

Thus the correct answer is (B) Ferric oxide and hydrogen.
Question 9
1 / -0

Which of the following would describe the behavior of the molecules or ions of $$AgNO_{3}(s)$$ in water?

A
$$Ag^{+}$$ ions are surrounded by the oxygen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the hydrogen's of water molecules.

B
$$Ag^{+}$$ ions are surrounded by the hydrogen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the oxygen's of water molecules.

C
$$Ag^{+}$$ ions are surrounded by the oxygen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the oxygen's of water molecules.

D
$$AgNO_{3}$$ does not separate into ions in water because it is not water soluble.

Solution

$$AgNO_3$$ is an ionic compound. Thus it gets dissociated when added to water into $$Ag^+$$ ions and $${NO_3}^-$$ ions.
Positively charged $$Ag^+$$ ions will be surrounded by negatively charged oxygen of water molecule and negatively charged $${NO_3}^-$$ ions are surrounded by hydrogens of water molecule to maintain electroneutrality principle.
Question 10
1 / -0

Water is considered an amphoteric substance. Which of following other substances can also be considered amphoteric?

A
$$H_{2}SO_{4}$$

B
$$HSO_{4}^{-}$$

C
$$SO_{4}^{2-}$$

D
$$CO_{3}^{2-}$$

Solution

Substances that can act as acid is one reaction and as a base in another are called amphoteric substances.
In the first reaction the bisulfate ion,$$ HSO_4^-$$ acts as a base. In the second reaction it acts as an acid:

1. $$HSO_4^-+H_3O^+\rightarrow H_2SO_4+H_2O$$
$$HSO_4^-$$ accepts a proton from $$H_3O^+$$

2. $$HSO_4^-+OH\rightarrow H_2O+SO_4^{-2}$$
$$HSO_4^-$$ gives (donates) a proton to $$OH^−$$

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Hydrogen Test - 37

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Hydrogen Test - 37

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Question 1

Odour

Colour

Solubility

Sand

Solution

Question 2

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

Statement I is correct, but Statement II is incorrect.

Statement I is incorrect, but Statement II is correct.

Solution

Question 3

Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1

Both the Statement 1 and Statement 2 are correct and Statement 2 is NOT the correct explanation of Statement 1.

Statement 1 is correct but Statement 2 is not correct.

Statement 1 is not correct but Statement 2 is correct.

Both the Statement 1 and Statement 2 are not correct.

Solution

Question 4

viscous

volatile

non-volatile

none of these

Solution

Question 5

Both Statement $$1$$ and Statement $$2$$ are correct and Statement 2 is the correct explanation of Statement $$1$$

Both Statement $$1$$ and Statement $$2$$ are correct, but Statement $$2$$ is NOT the correct explanation of Statement $$1$$

Statement $$1$$ is correct, but Statement $$2$$ is not correct

Statement $$1$$ is not correct, but Statement $$2$$ is correct

Solution

Question 6

Salt

Sugar

Oxygen

Sand

Solution

Question 7

$$Zn + 2H^+ \ \longrightarrow Zn^{2+} +\ H_2$$

$$Zn^{2+} + 2H^- \ \longrightarrow Zn +\ H_2$$

$$Zn^{2+} + 2H^+ \ \longrightarrow Zn^{2+} +\ H_2$$

None of the above

Solution

Question 8

Ferric hydroxide and hydrogen

Ferric oxide and hydrogen

Ferrous hydroxide and hydrogen

Ferrous oxide and hydrogen

Solution

Question 9

$$Ag^{+}$$ ions are surrounded by the oxygen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the hydrogen's of water molecules.

$$Ag^{+}$$ ions are surrounded by the hydrogen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the oxygen's of water molecules.

$$Ag^{+}$$ ions are surrounded by the oxygen's of water molecules while $$NO_{3}^{-1}$$ ions are surrounded with the oxygen's of water molecules.

$$AgNO_{3}$$ does not separate into ions in water because it is not water soluble.

Solution

Question 10

$$H_{2}SO_{4}$$

$$HSO_{4}^{-}$$

$$SO_{4}^{2-}$$

$$CO_{3}^{2-}$$

Solution

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