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NEET UG CHEMISTRY MCQ: PRACTICAL CHEMISTRY

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Understanding +4 | -1
Given below are two statements:

Statement (I): Kjeldahl method is applicable to
estimate nitrogen in pyridine.

Statement (II): The nitrogen present in pyridine
can easily be converted into ammonium sulphate in
Kjeldahl method.

In the light of the above statements, choose the
correct answer from the options given below.
View answer and explanation
Correct option: A
Both Statement I and Statement II is false
The correct answer is A (Both Statement I and Statement II is false) because Kjeldahl method is not applicable to estimate nitrogen in pyridine, and the nitrogen present in pyridine cannot be easily converted into ammonium sulphate in Kjeldahl method.

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A pale green crystalline inorganic salt (A) dissolves freely in water. It gives a brown precipitate on addition of aqueous NaOH.\mathrm{NaOH}. The solution of (A) also gives a black precipitate on bubbling H2S\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 ml100 \mathrm{~ml} of NaHC2O4\mathrm{NaHC}_2 \mathrm{O}_4 required 50 ml50 \mathrm{~ml} of 0.1 M KMnO40.1 \mathrm{~M} \, \mathrm{KMnO}_4 solution in acidic medium. Volume of 0.1 M NaOH0.1 \mathrm{~M} \mathrm{~NaOH} required by 100 ml100 \mathrm{~ml} of NaHC2O4\mathrm{NaHC}_2 \mathrm{O}_4 is The ion that cannot be precipitated by both HCl{HCl} and H2S{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)(HIn) and the base (In)(In) forms of the indicator by the expression. On heating colourless solid A,A, gas BB (liquid at room temp.) and gas CC are formed. AA is decomposed by NaOH\mathrm{NaOH} on heating to form gas DD giving white fumes with HCl.\mathrm{HCl}. Gas C{C} occupies 800 ml/g800 \mathrm{~ml} / \mathrm{g} at N.T.P. Hence AA is Standard HClHCl solution is titrated to a pink phenolphthalein endpoint by adding a NaOH\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?
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