Hydrogen Test

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Hydrogen Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

The hydride ion, $$H^{-}$$ is a stronger base than its hydroxide ion $$OH^{-}$$. Which of the following reactions will occur, if sodium hydride $$(NaH)$$ is dissolved in water?

A
$$H^{-}{\left ( aq \right )}+H_{2}O\rightarrow H_{2}O$$

B
$$H^{-}{\left ( aq \right )}+H_{2}O{\left ( l \right )}\rightarrow OH^{-}+H_{2}$$

C
$$H^{-}+H_{2}O\ \rightarrow\ No\ reaction$$

D
$$None\ of\ the\ above$$

Solution

Sodium hydride $$(NaH)$$ react with water to form hydrogen gas and the sodium hydroxide $$(NaOH)$$.
$$NaH+H_2O\rightarrow H_2+NaOH$$
i.e., $$Na^+, H^-$$ and $$H^+, OH^- $$ give rise to $$H_2$$ and $$NaOH$$. So, it is similar to option B.
Question 2
1 / -0

Among the hydrides given below which are reasonably good acid?

A
$$NH_{3}$$

B
$$HF$$

C
$$HN_{3}$$

D
$$NaH$$

Solution

The $$pK_a$$ values of the given compounds are:
$$HN_3$$:4.6
$$HF$$:3.17
$$NH_3$$:38
$$NaH$$:35
Higher the $$pK_a$$ lower will be the acidic strength. Since the $$pK_a$$ of $$NH_3$$ and $$NaH$$ are too high, they are basic in nature. Therefore among the given compounds $$HF$$ and $$HN_3$$ are acidic and $$HF$$ is more acidic.
Option B is correct.
Question 3
1 / -0

According to recent views, which is the current representation of hydrated proton in aqueous solution?

A
$$H^{+}$$

B
$$H_{9}O_{5}^{+}$$

C
$$H_{9}O_{4}^{+}$$

D
$$H_{3}O^+$$

Solution

The hydrated proton is represented as $$H_3O^+$$. Hence, the correct option is $$D$$.
Question 4
1 / -0

In which of the following reaction, dihydrogen acts as an oxidising agent?

A
$$Ca+H_{2}\rightarrow $$

B
$$H_{2}+O_{2}\rightarrow $$

C
$$H_{2}+F_{2}\rightarrow $$

D
$$CuO+H_{2}\rightarrow $$

Solution

As the calcium is having $$2$$ electrons more $$(1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2)$$ than the inert gas configuration, so it can give its two electrons to two hydrogens leading to the formation of $$CaH_2$$ and cause oxidation in $$Ca$$.

$$Ca+H_2\rightarrow CaH_2$$

Here, hydrogen is acting as the oxidising agent.
Question 5
1 / -0

$$2$$ g of $$Al$$ is treated separately with an excess of dil. $$H_{2}SO_{4}$$ and excess of $$NaOH$$. The ratio of the volume of hydrogen evolved is :

A
$$2:3$$

B
$$1:1$$

C
$$2:1$$

D
$$1:2$$

Solution
Question 6
1 / -0

The fuel used to produce electrical energy in the space rocket Saturn V, used by Neil Armstrong to reach the moon was:

A
$$CO+O_{2}$$

B
$$F_{2}+O_{2}$$

C
$$CH_{4}+O_{2}$$

D
liquid $$H_{2}+O_{2}$$

Solution

The fuel used was a liquid mixture of $$H_{2}$$ and $$O_{2}$$.

It was used for the following reasons:
1. $$H_{2}$$ is a highly efficient fuel, as it has the highest calorific value.

2. Mixing $$O_{2}$$ was required to support the combustion reaction: $$2H_{2}+O_{2}\rightarrow 2H_{2}O$$.

3. Further, the water produced at the end of the combustion reaction provided a good source of pure drinking water for the astronauts.
Question 7
1 / -0

The lightest element in the periodic table is_________.

A
lithium

B
fluorine

C
hydrogen

D
helium

Solution

The lightest element in the periodic table is hydrogen.
Its atomic weight is $$1.008$$ amu.
Question 8
1 / -0

Metal hydride on treatment with water gives________.

A
$$H_{2}O_{2}$$

B
$$H_{2}O$$

C
acid

D
hydrogen

Solution

Metal hydrides react with water to form hydrogen gas and the metal hydroxide.
Example: $$LiH+H_2O\rightarrow H_2+LiOH$$.
Question 9
1 / -0

Hydrogen finds a place in VII A group of periodic table because_________.

A
it is a light element

B
$$H -$$ atom has only one electron in its valence shell

C
it forms hydride of the type $$NaH$$

D
it has $$7$$ isotopes

Solution

Hydrogen finds a place in VII A group of periodic table because hydrogen forms a compound $$NaH$$ like halogens $$NaX$$ ($$X$$ is halogen).
Question 10
1 / -0

Hydrogen does not resemble alkali metals in which one of the following properties?

A
Tendency to form cation

B
Nature of oxide

C
Combination with halogens

D
Reducing character

Solution

Hydrogen loses one electron and forms cation $$(H^+)$$.

Oxides of hydrogen are neutral but metal oxides are basic in nature.

Hydrogen combines with halogens $$(X)$$ and forms $$HX$$ molecule.

Hydrogen loses one electron and causes reduction. Hence, it acts as a reducing agent.

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 17

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Hydrogen Test - 17

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Question 1

$$H^{-}{\left ( aq \right )}+H_{2}O\rightarrow H_{2}O$$

$$H^{-}{\left ( aq \right )}+H_{2}O{\left ( l \right )}\rightarrow OH^{-}+H_{2}$$

$$H^{-}+H_{2}O\ \rightarrow\ No\ reaction$$

$$None\ of\ the\ above$$

Solution

Question 2

$$NH_{3}$$

$$HF$$

$$HN_{3}$$

$$NaH$$

Solution

Question 3

$$H^{+}$$

$$H_{9}O_{5}^{+}$$

$$H_{9}O_{4}^{+}$$

$$H_{3}O^+$$

Solution

Question 4

$$Ca+H_{2}\rightarrow $$

$$H_{2}+O_{2}\rightarrow $$

$$H_{2}+F_{2}\rightarrow $$

$$CuO+H_{2}\rightarrow $$

Solution

Question 5

$$2:3$$

$$1:1$$

$$2:1$$

$$1:2$$

Solution

Question 6

$$CO+O_{2}$$

$$F_{2}+O_{2}$$

$$CH_{4}+O_{2}$$

liquid $$H_{2}+O_{2}$$

Solution

Question 7

lithium

fluorine

hydrogen

helium

Solution

Question 8

$$H_{2}O_{2}$$

$$H_{2}O$$

acid

hydrogen

Solution

Question 9

it is a light element

$$H -$$ atom has only one electron in its valence shell

it forms hydride of the type $$NaH$$

it has $$7$$ isotopes

Solution

Question 10

Tendency to form cation

Nature of oxide

Combination with halogens

Reducing character

Solution

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