Hydrogen MCQ Questions & Answers in Inorganic Chemistry | Chemistry
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191.
Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is the most important
in this respect?
A
Its tendency to lose an electron to form a cation.
B
Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.
C
Its low negative electron gain enthalpy value.
D
Its small size.
Answer :
Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.
Hydrogen resembles halogens as it has similar tendency to gain a single electron to attain stable noble gas configuration.
192.
Which of the following metals will react with $$NaOH$$ and $$KOH$$ to liberate hydrogen gas?
$$S{O_2}$$ changes to $${H_2}S{O_4}$$ ( $$O.N.$$ changes from $$+4$$ to $$+6$$ oxidation )
$$2KI \to {I_2}$$ ( $$O.S.$$ changes from $$–1$$ to $$0$$ oxidation )
$$PbS \to PbS{O_4}$$ ( $$O.S.$$ changes from $$–2$$ to $$+6$$ oxidation )
$$A{g_2}O \to 2Ag$$ ( $$O.S.$$ changes from $$+1$$ to $$0$$ reduction )
195.
Very pure hydrogen $$\left( {99.9} \right)$$ can be made by which of the following processes?
A
Reaction of methane with steam
B
Mixing natural hydrocarbons of high molecular weight
C
Electrolysis of water
D
Reaction of salts like hydrides with water
Answer :
Reaction of salts like hydrides with water
Very pure hydrogen can be prepared by the action of water on sodium hydride.
$$NaH + {H_2}O \to \mathop {NaOH + {H_2}}\limits_{\left( {{\text{very}}\,{\text{pure}}\,{\text{Hydrogen}}} \right)} $$
196.
The oxide that gives $${H_2}{O_2}$$ on treatment with dilute $${H_2}S{O_4}$$ is
A
$$Pb{O_2}$$
B
$$Ba{O_2} \cdot 8{H_2}O$$
C
$$Mn{O_2}$$
D
$$Ti{O_2}$$
Answer :
$$Ba{O_2} \cdot 8{H_2}O$$
$$Ba{O_2} \cdot 8{H_2}{O_{\left( s \right)}} + {H_2}S{O_{4\left( {aq} \right)}} \to $$ $$BaS{O_{4\left( s \right)}} + {H_2}{O_{2\left( {aq} \right)}} + 8{H_2}{O_{\left( l \right)}}$$
197.
Which of the following act as a stabiliser for the storage of $${H_2}{O_2}?$$
A
Alkali
B
Dust
C
Urea
D
None of these
Answer :
Urea
$${H_2}{O_2}$$ decomposes slowly on exposure to light.
$$2{H_2}{O_2}_{\left( l \right)} \to 2{H_2}{O_{\left( l \right)}} + {O_{2\left( g \right)}}$$
In the presence of metal surfaces or traces of alkali ( present in glass containers ), the above reaction is catalysed. It is, therefore, stored in wax-lined glass or plastic vessels in dark. Urea can be added as a stabiliser. It is kept away from dust because dust can induce explosive decomposition of the compound.
198.
The alum used for purifying water is
A
Ferric alum
B
Chrome alum
C
Potash alum
D
Ammonium alum
Answer :
Potash alum
Potash alum is used for purifying water.
199.
In which of the following reactions $${H_2}O$$ acts as a Bronsted acid?
A
$${H_2}{O_{\left( l \right)}} + N{H_{3\left( {aq} \right)}} \rightleftharpoons OH_{\left( {aq} \right)}^ - + NH_{4\left( {aq} \right)}^ + $$
B
$${H_2}{O_{\left( l \right)}} + {H_2}{S_{\left( {aq} \right)}} \rightleftharpoons {H_3}O_{\left( {aq} \right)}^ + + HS_{\left( {aq} \right)}^ - $$
C
$${H_2}{O_{\left( l \right)}} + {H_2}{O_{\left( l \right)}} \rightleftharpoons {H_3}O_{\left( {aq} \right)}^ + + OH_{\left( {aq} \right)}^ - $$
D
$$H_{\left( {aq} \right)}^ + + OH_{\left( {aq} \right)}^ - \rightleftharpoons {H_2}{O_{\left( l \right)}}$$
$${H_2}O$$ acts as a Bronsted acid and gives a proton to react with a base.
$$\mathop {{H_2}O}\limits_{{\text{acid}}} + \mathop {N{H_3}}\limits_{{\text{base}}} \rightleftharpoons O{H^ - } + NH_4^ + $$
In $$\mathop {{H_2}O}\limits_{{\text{base}}} + \mathop {{H_2}S}\limits_{{\text{acid}}} \to {H_3}{O^ + } + H{S^ - },{H_2}O$$ acts as a base with $${H_2}S.$$
200.
Sample of water has hardness $$77.5\,ppm\,C{a^{2 + }}.$$ If this is passed through an ion exchange column where $$C{a^{2 + }}$$ is replaced by $${H^ + },$$ what is the $$pH$$ of water after it has been so treated?