Hydrogen MCQ Questions & Answers in Inorganic Chemistry | Chemistry
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91.
When electric current is passed through an ionic hydride in molten state :
$$Ba{O_2} \cdot 8{H_2}{O_{\left( s \right)}} + {H_2}S{O_{4\left( {aq} \right)}} \to $$ $$BaS{O_{4\left( s \right)}} + {H_2}{O_{2\left( {aq} \right)}} + 8{H_2}{O_{\left( l \right)}}$$
94.
Hydrolysis of $$SiC{l_4}$$ gives
A
$$SiOC{l_2}$$
B
$$Si{O_2}$$
C
$${H_2}Si{O_4}$$
D
$${\text{none of these}}$$
Answer :
$$Si{O_2}$$
$$SiC{l_{4\left( l \right)}} + 2{H_2}{O_{\left( l \right)}} \to $$ $$Si{O_{2\left( s \right)}} + 4HC{l_{\left( {aq} \right)}}$$
95.
The dielectric constant of $${H_2}O$$ is $$80.$$ The electrostatic force of attraction between $$N{a^ + }$$ and $$C{l^ - }$$ will be
A
reduced to $$\frac{1}{{40}}$$ in water than in air
B
reduced to $$\frac{1}{{80}}$$ in water than in air
C
will be increased to 80 in water than in air
D
will remain unchanged.
Answer :
reduced to $$\frac{1}{{80}}$$ in water than in air
Electrostatic forces of attraction are reduced to $${\frac{1}{{80}}^{th}}$$ in water.
96.
The formula for permutit or zeolite which is used as softner in ion-exchange method is
A
$$NaAlSi{O_4}$$
B
$$NaAl{O_2}$$
C
$$C{a_3}{\left( {P{O_4}} \right)_2}$$
D
$$N{a_2}S{O_4}$$
Answer :
$$NaAlSi{O_4}$$
Zeolite/permutit is hydrated sodium aluminium silicate which is also written as $$N{a_2}Z.$$
97.
Carbon hydrides of the type, $${C_n}{H_{2n + 2}}$$ do not act as Lewis acid or Lewis base. They behave as normal covalent 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
Answer :
carbon hydrides are electron - precise hydrides
Carbon hydrides with general formula $${C_n}{H_{2n + 2}}$$ are electron - precise hydrides like $$C{H_4}.$$ They have a complete octet hence they do not behave as Lewis acid or Lewis base.
98.
What happens when an alkaline solution of potassium ferricyanide is reacted with $${H_2}{O_2}?$$
A
Potassium ferricyanide is oxidised to potassium ferrocyanide and $${H_2}{O_2}$$ is oxidised to $${O_2}.$$
B
Potassium ferricyanide becomes colourless and $${H_2}{O_2}$$ is oxidised to $${O_2}.$$
C
Potassium ferricyanide is reduced to ferric hydroxide and $${H_2}{O_2}$$ is oxidised to $${H_2}O.$$
D
Potassium ferricyanide is reduced to potassium ferrocyanide and $${H_2}{O_2}$$ is oxidised to $${O_2}.$$
Answer :
Potassium ferricyanide is reduced to potassium ferrocyanide and $${H_2}{O_2}$$ is oxidised to $${O_2}.$$
99.
Which of the following statements are correct ?
i) Hydrogen peroxide is industrially prepared by the auto-oxidation of 2-alkyl anthraquinols
(ii) One millilitre of $$30\% \,{H_2}{O_2}$$ means that solution will give $$100\,V$$ of oxygen at $$STP$$
(iii) Dihedral angle of $${H_2}{O_2}$$ in gas phase is $${90.2^ \circ }$$ and in solid phase dihedral angle is $${111.5^ \circ }$$
A
(i), (ii) and (iii)
B
(i) and (iii)
C
(ii) and (iii)
D
(i) and (ii)
Answer :
(i) and (ii)
Dihedral angle of $${H_2}{O_2}$$ in gas phase is $${111.5^ \circ }$$ and in solid phase it is $${90.2^ \circ }$$
100.
Consider the following statements :
1. Atomic hydrogen is obtained by passing hydrogen through an electric arc.
2. Hydrogen gas will not reduce heated aluminium oxide.
3. Finely divided palladium adsorbs large volume of hydrogen gas
4. Pure nascent hydrogen is best obtained by reacting $$Na$$ with $${C_2}{H_5}OH$$
Which of the above statements is/are correct ?
A
1 alone
B
2 alone
C
1, 2 and 3
D
2, 3 and 4
Answer :
1, 2 and 3
Pure hydrogen is evolved by reacting absolute alcohol and $$Na$$
$${C_2}{H_5}OH + Na \to {C_2}{H_5}ONa + \frac{1}{2}{H_2}$$
other statements are correct.