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Tardigrade
Question
Chemistry
K2Cr2O7 on heating with aqueous NaOH gives
Q.
K
2
C
r
2
O
7
on heating with aqueous
N
a
O
H
gives
2705
215
AIPMT
AIPMT 1997
The d-and f-Block Elements
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A
C
r
O
4
2
−
44%
B
C
r
(
O
H
)
3
15%
C
C
r
2
O
7
2
−
31%
D
C
r
(
O
H
)
2
10%
Solution:
K
2
C
r
2
O
7
+
2
N
a
O
H
⟶
K
2
C
r
O
4
+
N
a
2
C
r
O
4
+
H
2
O
Hence,
C
r
O
4
2
−
ion is obtained.