SATHEE: D-And F-Block Elements Ques 86

D-And F-Block Elements Ques 86

Question: $C r O_{3}$ dissolves in aqueous $N a O H$ to give

[J & K 2005]

Options:

A) $C r O_{4}^{2 -}$

B) $C r (O H)_{3}^{-}$

C) $C r_{2} O_{7}^{2 -}$

D) $C r {(O H)}_{2}$

Show Answer

Answer:

Correct Answer: A

Solution:

$C r O_{3}$ reacts with aqueous NaOH to form $N a_{2} C r O_{4}$ that is $C r O_{4}^{- 2} .$

$C r O_{3} + 2 N a O H \to \underset{Yellow solution}{N a_{2} C r O_{4}}, + H_{2} O$

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