Chemistry - Complete d-block Question with Solution | TestHub

ChemistryComplete d-blockd-blockEasy2 minPYQ_2020

ChemistryEasysingle choice

Pick out incorrect statement about $K_{2} C r_{2} O_{7}$ .

Options:

Answer:

Solution:

Here option D is not correct as oxygen is evolved only when $K_{2} C r_{2} O_{7}$ is heated with conc. $H_{2} S O_{4}$ .

$2 K_{2} C r_{2} O_{7} + 8 H_{2} S O_{4} \overset{Δ}{\to} 2 K_{2} S O_{4} + 2 C r_{2} {(S O_{4})}_{3} + 8 H_{2} O + 3 O_{2}$

A. $C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O$

$S^{2 -} \to S + 2 e^{-} \times 3$

B. $2 I^{-} \to I_{2} + 2 e^{-}$

C. $2 C l^{-} \to C l_{2} + 2 e^{-}$

Stream:NTA_ABHYASSubject:ChemistryTopic:Complete d-blockSubtopic:d-block

⏱ 2mℹ️ Source: PYQ_2020

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