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Q.

25 ml of a 0.1 (M) solution of a stable cation of transition metal z reacts exactly with 25 ml of 0.04 (M) acidified KMnO4 solution. Which of the following is most likely to represent the change in oxidation state of Z correctly ?

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a

Z+→  Z2+

b

Z2+→  Z3+

c

Z3+→  Z4+

d

Z2+→  Z4+

answer is D.

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Detailed Solution

(VM×n-factor)Z = (VM×n-factor)KMnO425 x 0.1 x   n-factor = 25 x 0.04 x 5n-factor = 25× 0.04 × 525 × 0.1 = 2which is possible in (d) option
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