141. The molecular formula of a commercial resin used for exchanging ions in water softening is $${C_8}{H_7}S{O_3}Na\left( {Mol.\,wt.\,206} \right).$$ What would be the maximum uptake of $$C{a^{2 + }}$$ ions by the resin when expressed in mole per gram resin?
A
$$\frac{2}{{309}}$$
B
$$\frac{1}{{412}}$$
C
$$\frac{1}{{103}}$$
D
$$\frac{1}{{206}}$$
Answer :
$$\frac{1}{{412}}$$
142.
Two structures of $${H_2}{O_2}$$ are drawn below. Identify the phases $$X$$ and $$Y$$ of $${H_2}{O_2}.$$
A
$$\left( X \right)$$ is the structure of $${H_2}{O_2}$$ in gas phase and $$\left( Y \right)$$ in solid phase
B
$$\left( X \right)$$ is structure of $${H_2}{O_2}$$ in solid phase and $$\left( Y \right)$$ in gas phase
C
$$\left( X \right)$$ and $$\left( Y \right)$$ are structures of $${H_2}{O_2}$$ in gas phase
D
$$\left( X \right)$$ and $$\left( Y \right)$$ are structures of $${H_2}{O_2}$$ in solid phase
Answer :
$$\left( X \right)$$ is the structure of $${H_2}{O_2}$$ in gas phase and $$\left( Y \right)$$ in solid phase
143. A $$5.0\,mL$$ solution of $${H_2}{O_2}$$ liberates $$1.27\,g$$ of iodine from an acidified $$KI$$ solution. The percentage strength of $${H_2}{O_2}$$ is
A
11.2
B
5.6
C
1.7
D
3.4
Answer :
3.4
144. Pick out the correct statement
A
By decreasing the temperature pure parahydrogen can be obtained
B
By increasing the temperature pure orthohydrogen can be obtained
C
By decreasing the temperature pure orthohydrogen can be obtained
D
By increasing the temperature pure parahydrogen can be obtained
Answer :
By decreasing the temperature pure parahydrogen can be obtained
145.
What is the reaction given below, called?
$${H_2}{O_{\left( l \right)}} + {H_2}{O_{\left( l \right)}} \rightleftharpoons {H_3}O_{\left( {aq} \right)}^ + + OH_{\left( {aq} \right)}^ - $$
A
Hydrolysis of water
B
Hydration of water
C
Disproportionation of water
D
Auto - protolysis of water
Answer :
Auto - protolysis of water
146. In Bosch’s process, which gas is utilised for the production of hydrogen gas ?
A
Producer gas
B
Water gas
C
Coal gas
D
None of these
Answer :
Water gas
147. The structure of $${H_2}{O_2}$$ is
A
planar
B
non-planar
C
spherical
D
linear
Answer :
non-planar
148. $${D_2}O$$ is preferred to $${H_2}O,$$ as a moderator, in nuclear reactors because
A
$${D_2}O$$ slows down fast neutrons better
B
$${D_2}O$$ has high specific heat
C
$${D_2}O$$ is cheaper
D
None of these
Answer :
None of these
149. Syngas is a mixture of
A
$$C{O_2} + {H_2}$$
B
$$CO + {H_2}$$
C
$$CO + C{O_2}$$
D
$$CO + {O_2}$$
Answer :
$$CO + {H_2}$$
150. Which statement is wrong ?
A
Ordinary hydrogen is an equilibrium mixture of ortho and para hydrogen
B
In ortho hydrogen spin of two nuclei is in same direction
C
Ortho and para forms do not resemble in their chemical properties
D
In para hydrogen spin of two nuclei is in opposite direction.
Answer :
Ortho and para forms do not resemble in their chemical properties