111. Which of the following terms is not correct for hydrogen?
A
Its molecule is diatomic
B
It exists both as $${H^ + }$$ and $${H^ - }$$ in different chemical compounds
C
It is the only species which has no neutrons in the nucleus
D
Heavy water is unstable because hydrogen is substituted by its isotope deuterium
Answer :
Heavy water is unstable because hydrogen is substituted by its isotope deuterium
112. Which of the following represents calgon?
A
$$N{a_2}A{l_2}S{i_2}{O_8}$$
B
$$M{g_3}{\left( {P{O_4}} \right)_2}$$
C
$$N{a_2}\left[ {N{a_4}{{\left( {P{O_3}} \right)}_6}} \right]$$
D
$$N{a_2}\left[ {M{g_2}{{\left( {P{O_3}} \right)}_6}} \right]$$
Answer :
$$N{a_2}\left[ {N{a_4}{{\left( {P{O_3}} \right)}_6}} \right]$$
113. $$2\,g$$ of aluminium is treated separately with excess of dilute $${H_2}S{O_4}$$ and excess of $$NaOH.$$ The ratio of the volumes of hydrogen evolved is
A
2 : 3
B
1 : 1
C
2 : 1
D
1 : 2
Answer :
1 : 1
114. Hydrogen at room temperature contains :
A
$$25\% \,ortho + 75\% \,para$$
B
$$25\% \,para + 75\% \,ortho$$
C
$$50\% \,ortho + 50\% \,para$$
D
$$60\% \,ortho + 34\% \,para$$
Answer :
$$25\% \,para + 75\% \,ortho$$
115. The hydride ion $${H^ - }$$ is a stronger base than hydroxide ion $$O{H^ - }.$$ Which of the following reactions will occur if sodium hydride $$\left( {NaH} \right)$$ is dissolved in water?
A
$$H_{\left( {aq} \right)}^ - + {H_2}{O_{\left( l \right)}} \to {H_3}O_{\left( {aq} \right)}^ - $$
B
$$H_{\left( {aq} \right)}^ - + {H_2}{O_{\left( l \right)}} \to OH_{\left( {aq} \right)}^ - + {H_{2\left( g \right)}}$$
C
$$H_{\left( {aq} \right)}^ - + {H_2}{O_{\left( l \right)}} \to {\text{no reaction}}$$
D
$${\text{None of these}}$$
Answer :
$$H_{\left( {aq} \right)}^ - + {H_2}{O_{\left( l \right)}} \to OH_{\left( {aq} \right)}^ - + {H_{2\left( g \right)}}$$
116. Hydrogen burns in air with a
A
light bluish flame
B
yellow flame
C
crimson red flame
D
green flame
Answer :
light bluish flame
117. Which substance does not speed up decomposition of $${H_2}{O_2}?$$
A
$${\text{Glycerol}}$$
B
$$Pt$$
C
$${\text{Gold}}$$
D
$$Mn{O_2}$$
Answer :
$${\text{Glycerol}}$$
118. Hydrogen peroxide is obtained by the electrolysis of __________.
A
water
B
sulphuric acid
C
hydrochloric acid
D
fused sodium peroxide
Answer :
sulphuric acid
119. In context with the industrial preparation of hydrogen from water gas $$\left( {CO + {H_2}} \right),$$ which of the following is the correct statement?
A
$$CO\,and\,{H_2},$$ are fractionally separated using differences in their densities
B
$$CO$$ is removed by absorption in aqueous $$C{u_2}C{I_2}$$ solution
C
$${H_2}\,$$ is removed through occlusion with $$pd$$
D
$$CO$$ is oxidised to $$C{O_2}$$ with steam in the presence of a catalyst followed by absorption of of $$C{O_2}$$ in alkali
Answer :
$$CO$$ is oxidised to $$C{O_2}$$ with steam in the presence of a catalyst followed by absorption of of $$C{O_2}$$ in alkali
120. The reaction of $${H_2}{O_2}$$ with sulphur is an example of ........ reaction
A
Addition
B
Oxidation
C
Reduction
D
Redox
Answer :
Redox
