D-And F-Block Elements Ques 86

Question: $ CrO_3 $ dissolves in aqueous $ NaOH $ to give

[J & K 2005]

Options:

A) $ CrO_4^{2-} $

B) $ Cr(OH)_3^{-} $

C) $ Cr_2O_7^{2-} $

D) $ Cr{{(OH)}_2} $

Show Answer

Answer:

Correct Answer: A

Solution:

$CrO_3$ reacts with aqueous NaOH to form $Na_2CrO_4$ that is $CrO^{−2} _4.$

$ CrO_3+2NaOH\to \underset{\text{Yellow solution}}{\mathop{Na_2CrO_4}},+H_2O $



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