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Redox titrations with KMnO4 and K2Cr2O7
NEET level
Single correct option
Difficulty 1 of 3
eq057
The equivalent mass of
K
X
2
Cr
X
2
O
X
7
(molar mass
294
g
mo
l
−
1
) as an oxidant in acidic medium, where
Cr
X
2
O
X
7
X
2
−
changes to
Cr
X
3
+
, is
A
98
B
147
C
294
D
49
Answer: D
Two Cr atoms each change from +6 to +3, so the n-factor is 6. Equivalent mass = 294/6 = 49 g/equiv.
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