Hydrogen MCQ Questions & Answers in Inorganic Chemistry | Chemistry
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21.
$$2\,g$$ of aluminium is treated separately with excess of dilute $${H_2}S{O_4}$$ and excess of $$NaOH.$$ The ratio of volumes of hydrogen evolved under similar conditions of pressure and temperature is
A
2 : 3
B
1 : 1
C
2 : 1
D
1 : 2
Answer :
1 : 1
$$2Al + 3{H_2}S{O_4} \to $$ $$A{l_2}{\left( {S{O_4}} \right)_3} + 3{H_2}$$
$$2Al + 2NaOH + 2{H_2}O \to $$ $$2NaAl{O_2} + 3{H_2}$$
Thus, ratio of volumes of hydrogen evolved is 1 : 1.
22.
Among $$Ca{H_2},N{H_3},NaH$$ and $${B_2}{H_6},$$ which are covalent hydrides?
A
$$N{H_3}\,\,{\text{and}}\,\,{B_2}{H_6}$$
B
$$NaH\,\,{\text{and}}\,\,Ca{H_2}$$
C
$$NaH\,\,{\text{and}}\,\,N{H_3}$$
D
$$Ca{H_2}\,\,{\text{and}}\,\,{B_2}{H_6}$$
Answer :
$$N{H_3}\,\,{\text{and}}\,\,{B_2}{H_6}$$
Non-metal hydrides are covalent hydrides.
23.
Heavy water $$\left( {{D_2}O} \right)$$ freezes at
A
$$ - 3.8{\,^ \circ }C$$
B
$$3.8{\,^ \circ }C$$
C
$$0{\,^ \circ }C$$
D
$$38{\,^ \circ }C$$
Answer :
$$3.8{\,^ \circ }C$$
Heavy water freezes at $$3.8{\,^ \circ }C.$$
24.
The temporary hardness of water due to calcium bicarbonate can be removed by adding
25.
The density of water is less in its solid state because
A
in solid state (ice), water molecules are arranged in highly ordered open cage like structure
B
more extensive hydrogen bonding is present in solid state ice
C
the water molecules are closest in solid state of water
D
water is a rigid crystalline, closely packed structure in its solid state
Answer :
in solid state (ice), water molecules are arranged in highly ordered open cage like structure
The water has maximum density at $${4^ \circ }C$$ when it is converted to ice, an open cage three dimensional structure is formed therefore the density decreases.
26.
When sodium peroxide is treated with dilute sulphuric acid, we get __________.
27.
When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together ?
A
Hydrogen bond formation
B
van der Waals forces
C
Covalent attraction
D
Ionic interaction
Answer :
Hydrogen bond formation
Two ice cubes stick to each other due to $$H$$ - bonding
28.
The hydride $$ion\,{H^ - }$$ is stronger base than its hydroxide ion $$O{H^ - }.$$ Which of the following reactions will occur if sodium hydride $$\left( {NaH} \right)$$ is dissolved in water ?
$${H^ - }\left( {aq} \right) + {H_2}O\left( l \right) \to O{H^ - } + {H_2}.$$ Since $${H^ - }$$ is a strong base it will abstract $${H^ + }$$ to form $${H_2}O.$$
29.
The oxide that gives hydrogen peroxide on treatment with a dilute acid is :
30.
$$HCl$$ is added to following oxides. Which one would give $${H_2}{O_2}$$
A
$$Mn{O_2}$$
B
$$Pb{O_2}$$
C
$$BaO$$
D
$${\text{None}}$$
Answer :
$${\text{None}}$$
$$Mn{O_2},Pb{O_2}$$ and $$BaO$$ will not give $${H_2}{O_2}$$ with $$HCl.Mn{O_2}$$ and $$Pb{O_2}$$ will give $$C{l_2}$$ and $$BaO$$ will react with $$HCl$$ to give $$BaC{l_2}$$ and water.