Which of the following compounds on reaction with ${\rm{NaOH}}$ and ${{\rm{H}}_2}{{\rm{O}}_2}$ gives yellow colour?

${\rm{Cr}}{\left( {{\rm{OH}}} \right)_3}$

${\rm{Al}}{\left( {{\rm{OH}}} \right)_3}$

NEET UG CHEMISTRY MCQ: S-BLOCK ELEMENTS

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Understanding +4 | -1

Which of the following compounds on reaction with

\mathrm{NaOH}

and

{\mathrm{H}_2}{\mathrm{O}_2}

gives yellow colour?

View answer and explanation

Correct option: B

\mathrm{Cr}{\left( {\mathrm{OH}} \right)_3}

Option B is correct because chromium(III) hydroxide reacts with sodium hydroxide and hydrogen peroxide to form sodium chromate, which has a yellow color.

NEET UG CHEMISTRY MCQ: S-BLOCK ELEMENTS

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