Hydrogen Test

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Hydrogen Test - 42

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Weekly Quiz Competition

Question 1
1 / -0

Dihydrogen can be prepared on a commercial by the action of steam on hydrocarbons, when a mixture of CO and H$$_2$$ gas is formed. It is known as________.

A
water gas

B
producer gas

C
industrial gas

D
fuel gas
Question 2
1 / -0

Molecular mass of water ______.

A
$$18 u$$

B
$$16 u$$

C
$$15 u$$

D
$$10 u$$

Solution

As we know the molecular formula of water is H2O which means that one molecule of water contain 2 atoms of hydrogen and 1 atom of oxygen.
Then weight of 1 atom of hydrogen= 1 u
so weight of 2 atom= 2 u
Weight of 1 atom of oxygen= 16 u
Then molecular weight of water= 2* weight of 1 atom of hydrogen+ weight of 1 atom of oxygen
Thus molecular weight of water is approximately 2+16 u = 18 u
Question 3
1 / -0

$$K_{a}$$ for cyano acetic acid is $$3.5\ 10^{-3}$$. Then the degree of hydrolysis of $$0.05\ M$$ sodium cyano acetate solution will have the value:

A
$$4.559\times 10^{-6}$$

B
$$5.559\times 10^{-6}$$

C
$$6.559\times 10^{-6}$$

D
$$7.559\times 10^{-6}$$

Solution

Given: Degree of hydrolysis= $$0.05M$$
$$K_{a}$$ for cyno acetic acid= $$3.5\times 10^{-3}$$

Solution: The degree of hydrolysis is given by,
=$$\sqrt{\dfrac{K_{w}}{K_{a}c}}$$

Substituting the values we get,
$$\sqrt{\dfrac{1\times 10^{-14}}{3.5\times 10^{-3}\times 0.05}}$$ ($$K_{w}$$=$$1\times 10^{-14}$$)

On solving we get,
$$7.559\times 10^{-6}$$

Hence, the correct option is (D).
Question 4
1 / -0

From group 6 only one metal forms hydride. This metal is:

A
Mo

B
W

C
Cr

D
Co

Solution

The low affinity of the elements of the group $$6,7,8$$ and $$9$$ towards hydrogen in their normal oxidation states prevent the formation of hydrides. This is called as hydride gap.
In the group, $$6$$, Chromium $$(Cr)$$ is an exception as it is the only group $$6$$ element to form a hydride.

Answer: $$(Cr)$$
Question 5
1 / -0

Which of the following metals directly combine with hydrogen gas to give a hydride?

A
Au

B
Ni

C
Ca

D
Cu

Solution

Amongst, $$Au$$, $$Ni$$, $$Ca$$ and $$Cu$$, $$Ca$$ is the most reactive metal. So it easily combines with $$H_2$$ to form hydride while the other metals do not combine directly.

The reaction can be given as:-
$$Ca+H_2\longrightarrow CaH_2$$
Question 6
1 / -0

Which of the following statement 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 of halogens

Solution

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 like $$NaH$$. In the above compounds with $$Na$$ and $$F$$ show +1 and -1 oxidation state respectively.
Question 7
1 / -0

On moving from left to right in a period what is the order of acidic character of hydrides?

A
$$NH_{3} < H_{2}O < HF$$

B
$$HF < H_{2}O < NH_{3}$$

C
$$H_{2}O < HF < NH_{3} $$

D
$$H_{2}O < NH_{3} < HF$$

Solution

On moving from left to right in a period, the acidic character of hydrides increases. $$NH_{3}$$ is basic, $$H_{2}O $$ is neutral and $$HF$$ is acidic.
Electronegativity increases from left to right in a period. The ease of losing a proton increases and acidity increases. Acidity is the ability to donate a proton.
Question 8
1 / -0

Syngas is a mixture of ?

A
$$CO_{2} + H_{2}$$

B
$$CO + H_{2}$$

C
$$CO + CO_{2} $$

D
$$CO + O_{2}$$

Solution

Syngas also is known as synthetic gas or water gas is the name given to a mixture of carbon monoxide and hydrogen ($$CO$$ and $$H_{2}$$).
Question 9
1 / -0

Which of the following properties of hydrogen is incorrect?

A
Like halogens, hydrogen exists as a diatomic gas

B
Like halogens, hydrogen exhibits - 1 oxidation state in its compounds with metals

C
Like halogens, hydrogen is liberated at cathode

D
The ionization energy of hydrogen is quite close to halogens

Solution

Like halogens, hydrogen is liberated at anode, e.g.
2NaH $$\rightarrow 2Na + H_{2} $$ (at anode
2NaCl $$\rightarrow 2Na + cl_{2}$$ (at anode)
Question 10
1 / -0

Carbon hydrides of the type, $$C_{n}H_{2n+2}$$ do not act as Lewis acid or Lewis base.They behave as normal carbon hydrides because:

A
carbon hydrides are electron-rich hydrides

B
carbon hydrides are electron-deficient hydrides

C
carbon hydrides are electron-precise hydrides

D
carbon hydrides are non-stoichiometric hydrides.

Solution

Carbon hydrides with general formula $$C_{n}H_{2n+2} $$ are electron-precise hydrides like $$CH_{4}$$. They have a complete octet and they do not have lone pair of electrons. Hence they neither donate nor accept electron pairs. They do not behave as Lewis acid or Lewis base.

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Hydrogen Test - 42

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Hydrogen Test - 42

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SHARING IS CARING

Question 1

water gas

producer gas

industrial gas

fuel gas

Question 2

$$18 u$$

$$16 u$$

$$15 u$$

$$10 u$$

Solution

Question 3

$$4.559\times 10^{-6}$$

$$5.559\times 10^{-6}$$

$$6.559\times 10^{-6}$$

$$7.559\times 10^{-6}$$

Solution

Question 4

Mo

W

Cr

Co

Solution

Question 5

Au

Ni

Ca

Cu

Solution

Question 6

Hydrogen shows +1 and -1 oxidation states

Hydrogen is never liberated at anode

Hydrogen has same ionisation enthalpy as that of alkali metals

Hydrogen has same electronegativity as of halogens

Solution

Question 7

$$NH_{3} < H_{2}O < HF$$

$$HF < H_{2}O < NH_{3}$$

$$H_{2}O < HF < NH_{3} $$

$$H_{2}O < NH_{3} < HF$$

Solution

Question 8

$$CO_{2} + H_{2}$$

$$CO + H_{2}$$

$$CO + CO_{2} $$

$$CO + O_{2}$$

Solution

Question 9

Like halogens, hydrogen exists as a diatomic gas

Like halogens, hydrogen exhibits - 1 oxidation state in its compounds with metals

Like halogens, hydrogen is liberated at cathode

The ionization energy of hydrogen is quite close to halogens

Solution

Question 10

carbon hydrides are electron-rich hydrides

carbon hydrides are electron-deficient hydrides

carbon hydrides are electron-precise hydrides

carbon hydrides are non-stoichiometric hydrides.

Solution

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