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Byju's Answer
Standard XII
Chemistry
Characteristics of Chemical Equilibrium
A balanced eq...
Question
A balanced equation for the conversion of magnesium to magnesium hydroxide is given by :
A
M
g
2
+
+
C
a
O
+
H
2
O
→
C
a
2
+
+
M
g
(
O
H
)
2
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B
2
M
g
2
+
+
C
a
O
+
H
2
O
→
C
a
2
+
+
2
M
g
(
O
H
)
2
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C
M
g
2
+
+
C
a
O
+
2
H
2
O
→
C
a
2
+
+
2
M
g
(
O
H
)
2
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D
M
g
2
+
+
2
C
a
O
+
H
2
O
→
2
C
a
2
+
+
M
g
(
O
H
)
2
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Solution
The correct option is
A
M
g
2
+
+
C
a
O
+
H
2
O
→
C
a
2
+
+
M
g
(
O
H
)
2
M
g
2
+
+
C
a
O
+
H
2
O
→
C
a
2
+
+
M
g
(
O
H
)
2
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0
Similar questions
Q.
Temporary hardness is due to
H
C
O
−
3
of
M
g
2
+
and
C
a
2
+
. It is removed by addition of
C
a
O
.
C
a
(
H
C
O
3
)
2
+
C
a
O
⟶
2
C
a
C
O
3
+
H
2
O
Mass of
C
a
O
required to precipitate
2
g
C
a
C
O
3
is
:
Q.
Temporary hardness is due to bicarbonates of
M
g
2
+
and
C
a
2
+
. It is removed by addition of CaO as follows:
C
a
(
H
C
O
3
)
2
+
C
a
O
→
2
C
a
C
O
3
+
H
2
O
Mass of CaO required to precipitate
2
g
C
a
C
O
3
Q.
Temporary hardness is due to bicarbonates of
M
g
2
+
and
C
a
2
+
. It is removed by addition of CaO as follows:
C
a
(
H
C
O
3
)
2
+
C
a
O
→
2
C
a
C
O
3
+
H
2
O
Mass of CaO required to precipitate
2
g
C
a
C
O
3
Q.
Temporary hardness is due to
H
C
O
−
3
of
M
g
2
+
and
C
a
2
+
. It is removed by addition of
C
a
O
.
C
a
(
H
C
O
3
)
2
+
C
a
O
→
2
C
a
C
O
3
+
H
2
O
Mass of
C
a
O
(in g) required to produce
2
g of
C
a
C
O
3
precipitate is:
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
.
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