Hydrogen MCQ Questions & Answers in Inorganic Chemistry | Chemistry
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71.
Water is :
A
more polar than $${H_2}S$$
B
more or less identical in polarity with $${H_2}S$$
C
less polar than $${H_2}S$$
D
None of these
Answer :
more polar than $${H_2}S$$
Polarity of bond depends on difference in electronegativity of the two concerned atoms. $${H_2}O$$ is more polar than $${H_2}S$$ because oxygen $$\left( {{\text{in}}\,O - H} \right)$$ is more electronegative than sulphur $$\left( {{\text{in}}\,S - H} \right).$$
72.
The isotopes of hydrogen have different physical properties due to difference in mass. They have almost same chemical properties with a difference in their rates of reactions which is mainly due to
A
their different enthalpy of bond dissociation
B
different electronic configurations
C
different atomic masses
D
different physical properties
Answer :
their different enthalpy of bond dissociation
Enthalpy of bond dissociation of deuterium is higher $$\left( {443.35\,kJ\,mo{l^{ - 1}}} \right)$$ than hydrogen $$\left( {435.88\,kJ\,mo{l^{ - 1}}} \right).$$
73.
Strength of 10 volume hydrogen peroxide solution means
75.
Consider the following statements :
(i) Atomic hydrogen is obtained by passing hydrogen through an electric arc.
(ii) Hydrogen gas will not reduce heated aluminium oxide.
(iii) Finely divided palladium adsorbs large volume of hydrogen gas.
(iv) Nascent hydrogen is less active than ordinary hydrogen.
Which of the above statements are correct?
A
Only (i), (ii)
B
Only (ii), (iv)
C
Only (i), (ii), (iii)
D
Only (i), (iv)
Answer :
Only (i), (ii), (iii)
Option (i), (ii) and (iii) are correct.
76.
Metal hydrides are ionic, covalent or molecular in nature. Among $$LiH,NaH,KH,RbH,CsH,$$ the correct order of increasing ionic character is
A
$$LiH > NaH > CsH > KH > RbH$$
B
$$LiH < NaH < KH < RbH < CsH$$
C
$$RbH > CsH > NaH > KH > LiH$$
D
$$NaH > CsH > RbH > LiH > KH$$
Answer :
$$LiH < NaH < KH < RbH < CsH$$
Ionic character increases with the size of the cation as we move down the group.
77.
Heavy water is
A
$${H_2}{}^{18}O$$
B
water obtained by repeated distillation
C
$${D_2}O$$
D
water at $${4^ \circ }C$$
Answer :
$${D_2}O$$
Heavy water is $${D_2}O$$ deuterium oxide.
78.
In which of the following reactions $${H_2}{O_2}$$ acts as a reducing agent?
79.
$$3.4\,g$$ sample of $${H_2}{O_2}$$ solution containing $$x\% $$ $${H_2}{O_2}$$ by weight requires $$x\,mL$$ of $$KMn{O_4}$$ solution for complete oxidation under acidic condition. The normality of $$KMn{O_4}$$ solution is
A
1$$\,N$$
B
2$$\,N$$
C
3$$\,N$$
D
0.5$$\,N$$
Answer :
2$$\,N$$
$$100\,g$$ of $${H_2}{O_2}$$ sample solution contains $$ = x\,g$$ of $${H_2}{O_2}$$
$$3.4\,g$$ of $${H_2}{O_2}$$ sample solution contains $$ = \frac{x}{{100}} \times 3.4$$
$$\eqalign{
& {\text{Weight of}}\,{H_2}{O_2} = \frac{{3.4\,x}}{{100}} \cr
& Eq.\,{\text{of}}\,{H_2}{O_2} = \frac{{3.4\,x}}{{100}} \times \frac{1}{{17}} \cr
& mEq\,\,{\text{of}}\,{H_2}{O_2} \cr
& = \frac{{3.4x}}{{100 \times 17}} \times 1000 \cr
& = \frac{{34\,x}}{{17}} = 2x \cr
& mEq\,\,{\text{of}}\,\,KMn{O_4} = x \times N \cr
& x \times N = 2x \cr
& N = 2 \cr} $$
80.
On moving from left to right in a period what is the order of acidic character of hydrides?
A
$$N{H_3} < {H_2}O < HF$$
B
$$HF < {H_2}O < N{H_3}$$
C
$${H_2}O < HF < N{H_3}$$
D
$${H_2}O < N{H_3} < HF$$
Answer :
$$N{H_3} < {H_2}O < HF$$
On moving from left to right in a period. the acidic character of hydrides increases. $$N{H_3}$$ is basic, $${H_2}O$$ is neutral and $$HF$$ is acidic.