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Byju's Answer
Standard XII
Chemistry
Uses of Slaked Lime
Which of the ...
Question
Which of the following reactions is known as slaking of lime?
A
C
a
C
O
3
→
C
a
O
+
C
O
2
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B
C
a
O
+
2
H
C
l
→
C
a
C
l
2
+
H
2
O
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C
C
a
C
O
3
+
H
2
O
→
C
a
(
O
H
)
2
+
C
O
2
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D
C
a
O
+
H
2
O
→
C
a
(
O
H
)
2
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Solution
The correct option is
C
C
a
O
+
H
2
O
→
C
a
(
O
H
)
2
Slaking of lime is the process of formation of slaked lime
C
a
(
O
H
)
2
by adding water to quicklime
C
a
O
C
a
O
+
H
2
O
→
C
a
(
O
H
)
2
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0
Similar questions
Q.
Following reaction is used to remove temporary hardness which is due to dissolved bicarbonates of
C
a
2
+
and
M
g
2
+
.
C
a
(
H
C
O
3
)
2
+
C
a
(
O
H
)
2
→
2
C
a
C
O
3
↓
+
2
H
2
O
Actually lime (
C
a
O
) is added which in
H
2
O
forms
C
a
(
O
H
)
2
and precipitates
C
a
C
O
3
C
a
O
+
H
2
O
→
C
a
(
O
H
)
2
If
10
L of hard water requires
0.56
g of
C
a
O
, temporary hardness of
C
a
C
O
3
is
x
×
10
2
ppm. Find
x
.
Q.
Identify the endothermic and exothermic reaction.
a. HCl + NaOH → NaCl + H
2
O + heat
b.
2
KClO
3
s
→
∆
2
KCl
s
+
3
O
2
↑
c. CaO + H
2
O → Ca(OH)
2
+ heat
d.
C
a
CO
3
s
→
∆
C
a
O
s
+
CO
2
↑
Q.
A process designed to remove organic sulphur from coal prior to combustion involves the reaction.
X
−
S
−
Y
+
2
N
a
O
H
→
X
−
O
−
Y
+
N
a
2
S
+
H
2
O
C
a
C
O
3
→
C
a
O
+
C
O
2
N
a
2
S
+
C
O
2
+
H
2
O
→
N
a
2
C
O
3
+
H
2
S
C
a
O
+
H
2
O
→
C
a
(
O
H
)
2
N
a
2
C
O
3
+
C
a
(
O
H
)
2
→
C
a
C
O
3
+
2
N
a
O
H
In the processing of 320 metric tons of a coal having 1.0% sulphur content, how much limestone
(
C
a
C
O
3
)
must be edecomposed to provide enough
C
a
(
O
H
)
2
to regenerate the NaOH used in the original leaching step?
Q.
The chemical reactions involved in the ammonia soda process are represented as follows:
2
N
a
C
l
+
C
a
C
O
3
→
N
a
2
C
O
3
+
C
a
C
l
2
In the following reactions,
C
a
C
O
3
Δ
−
→
[
A
]
+
[
B
]
N
a
C
l
+
N
H
3
+
[
B
]
+
H
2
O
→
[
C
]
+
[
D
]
2
[
C
]
→
N
a
2
C
O
3
+
H
2
O
+
[
B
]
Identify A to D:
Q.
Which reaction is this?
C
a
O
+
H
2
O
→
C
a
(
O
H
)
2
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