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JEE Main levelSingle correct optionDifficulty 2 of 3bn057

Which is the formula of chromium(III) sulfate?

A $Cr X_{3} (SO X_{4}) X_{2}$
B $Cr X_{2} (SO X_{4}) X_{3}$
C $Cr (SO X_{4}) X_{3}$
D $Cr X_{2} (SO X_{3}) X_{3}$

Answer: B

Chromium(III) is

Cr X^{3 +}

and sulfate is

SO X_{4} X^{2 -}

. The least common multiple of 3 and 2 is 6: two Cr and three sulfate,

Cr X_{2} (SO X_{4}) X_{3}

.

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