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NEET UG CHEMISTRY MCQ: PRACTICAL CHEMISTRY

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Understanding +4 | -1

When adding the acid from the burette into the conical flask
(i) the acid is initially added drop by drop
(ii) the conical flask is swirled while adding the acid
(iii) the conical flask is placed over a white tile or white sheet of paper
(iv) the inside of the conical flask is washed down from time to time with deionised water.
Which of the above procedures is/are not carried out during the titration?

View answer and explanation

Correct option: C

(i) only

Option C (i) only is correct because initially, the acid is added drop by drop, the conical flask is swirled, and it's placed over a white tile. Washing down the flask with deionized water is also a standard practice.

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A pale green crystalline inorganic salt (A) dissolves freely in water. It gives a brown precipitate on addition of aqueous

\mathrm{NaOH}.

The solution of (A) also gives a black precipitate on bubbling

\mathrm{H}_2 \mathrm{S}

in alkaline medium. An aqueous solution of the (A) decolorizes the pink colour of the permanganate solution. The metal in the salt solution is

100 \mathrm{~ml}

\mathrm{NaHC}_2 \mathrm{O}_4

50 \mathrm{~ml}

0.1 \mathrm{~M} \, \mathrm{KMnO}_4

solution in acidic medium. Volume of

0.1 \mathrm{~M} \mathrm{~NaOH}

100 \mathrm{~ml}

\mathrm{NaHC}_2 \mathrm{O}_4

is The ion that cannot be precipitated by both

{HCl}

{H}_2 {S}

is The rapid change of pH near the stoichiometric point of an acid-base titration in the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugated acid

(HIn)

(In)

forms of the indicator by the expression. On heating colourless solid

A,

B

(liquid at room temp.) and gas

C

A

is decomposed by

\mathrm{NaOH}

on heating to form gas

D

giving white fumes with

\mathrm{HCl}.

{C}

800 \mathrm{~ml} / \mathrm{g}

at N.T.P. Hence

A

HCl

solution is titrated to a pink phenolphthalein endpoint by adding a

\mathrm{NaOH}

solution while stirring. If a solution becomes pink throughout but loses its color upon standing for a short time, what should be done to restore the color?