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JEE CHEMISTRY MCQ: PRACTICAL CHEMISTRY

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\mathrm{PbCrO}_4

is yellow in colour due to

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Correct option: B

\mathrm{Cr} \mathrm{O}_4^{-2}

Option B (

\mathrm{Cr} \mathrm{O}_4^{-2}

) is correct because the chromate ion (

\mathrm{Cr} \mathrm{O}_4^{-2}

) is responsible for the yellow color of

\mathrm{PbCrO}_4

.

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In Carius method for the estimation of sulphur precipitate is formed due to the formation of Mercurous chloride turns black on treatment with ammonium hydroxide. This is due to the formation of While preparing crystals of Mohr's salt, dil.

\mathrm{H}_2 \mathrm{SO}_4

is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil.

\mathrm{H}_2 \mathrm{SO}_4

is added here to:

Na_2CO_3

cannot be used to identify A substance on treatment with dil.

\mathrm{H}_2 \mathrm{SO}_4

liberates a colourless gas which produces (i) turbidity with baryta water and (ii) turns acidified dichromate solution green. The reaction indicates the presence of Which of the following situation exists at the equivalence point of a titration.