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Maximum degress of paramagnetism is observed in aqueous solution of

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${Cu}^{+ 2}$

${Fe}^{+ 3}$

${Cr}^{+ 3}$

${Ni}^{+ 2}$

answer is B.

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Detailed Solution

${Cu}^{+ 2} (3 d^{9}) . . . . . n = 1$

${Fe}^{+ 3} (3 d^{5}) . . . . . n = 5$

${Cr}^{+ 3} (3 d^{3}) . . . . n = 3$

${Ni}^{+ 2} (3 d^{8}) . . . . . n = 2$

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