Chemistry - Salt Analysis Question with Solution | TestHub

ChemistrySalt AnalysisTEST OF CATIONS Dry Test, Group Analysis, Group 1,2Medium2 minPYQ_2019

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Which of the following compounds, on reaction with $NaOH$ and ${Na}_{2} O_{2}$ gives yellow colour?

Options:

Answer:

Solution:

Chromium hydroxide, i.e. $Cr {(OH)}_{3}$ when reacts with $NaOH$ and ${Na}_{2} O_{2}$ , gives yellow colour of sodium chromate. The whole reaction is as follows

$3 {Na}_{2} O_{2} + 2 Cr {(OH)}_{3} ⟶ \underset{(yellow)}{2 {Na}_{2} {CrO}_{4}} + 2 H_{2} O + 2 NaOH$

Stream:BITSATSubject:ChemistryTopic:Salt AnalysisSubtopic:TEST OF CATIONS Dry Test, Group Analysis, Group 1,2

⏱ 2mℹ️ Source: PYQ_2019

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