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JEE CHEMISTRY MCQ: PRACTICAL CHEMISTRY

1 Medium

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The reagent

\mathrm{NH}_4 \mathrm{Cl}

and aqueous

\mathrm{NH}_3

will precipitate

View answer and explanation

Correct option: B

\mathrm{Al}^{3+}

Option B (

\mathrm{Al^{3+}}

) is correct because

\mathrm{Al^{3+}}

precipitates as

\mathrm{Al(OH)_3}

in the presence of

\mathrm{NH_4Cl}

and aqueous

\mathrm{NH_3}

.

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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:

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\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.