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Byju's Answer
Standard XII
Chemistry
Introduction and Degree of Hydrolysis
Cr 2 O 72- pH...
Question
C
r
2
O
2
−
7
p
H
=
x
−
−−
→
C
r
O
2
−
4
p
H
=
y
−
−−
→
C
r
2
O
2
−
7
p
H
value
x
and
y
can be:
A
4 and 5
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B
4 and 8
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C
8 and 3
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D
8 and 9
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Solution
The correct option is
C
8 and 3
C
r
2
O
2
−
7
+
2
O
H
−
→
2
C
r
O
2
−
4
+
2
H
2
O
p
H
>
7
(
x
>
7
)
2
C
r
O
2
−
4
+
2
H
+
→
C
r
2
O
2
−
7
+
H
2
O
p
H
<
7
(
y
<
7
)
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0
Similar questions
Q.
C
r
2
O
2
−
7
p
H
=
x
−
−−
→
C
r
O
2
−
4
p
H
=
y
−
−−
→
C
r
2
O
2
−
7
.The pH values of x and y can be:
Q.
C
r
2
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2
−
7
p
H
=
x
→
C
r
O
2
−
4
p
H
=
y
→
C
r
2
O
2
−
7
pH values x and y can be:
Q.
C
r
2
O
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−
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o
r
a
n
g
e
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H
=
x
⇆
p
H
=
y
C
r
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2
−
4
g
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e
e
n
.
This change is based on change in pH.
Find values of x and y :
Q.
C
r
2
O
2
−
7
p
H
=
x
−
−−
→
C
r
O
2
−
4
p
H
=
y
−
−−
→
C
r
2
O
2
−
7
.The `pH` values of x and y can be:
Q.
Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?
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