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Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced


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13 Questions MCQ Test Chemistry 35 Years JEE Main & Advanced Past year Papers | Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced for JEE 2022 is part of Chemistry 35 Years JEE Main & Advanced Past year Papers preparation. The Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced questions and answers have been prepared according to the JEE exam syllabus.The Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced MCQs are made for JEE 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced below.
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Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 1

The ion that cannot be precipitated by both HCl and H2S is

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 1

Sn2+ can be precipitated by H2S as chocolate colored precipitate SnS but not by HCl.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 2

 Which one among the following pairs of ions cannot be separated by H2S in dilute hydrochloric acid? (1986 - 1 Mark)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 2

NOTE : The ions of group II of salt analysis are precipitated by HCl and H2S whereas members of group IV are precipitated by H2S in alkaline medium.
∵ Bi3+ and Sn4+ both belong to group II
∴ They will be precipitated by HCl in presence of H2S.  Both Bi3+ and Sn4+ belong to group II of qualitativeinorganic analysis and will get precipitated by H2S.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 3

An aqueous solution contains Hg2+, Hg22+, Pb2+ and Cd2+.The addition of HCl (6N) will precipitate : (1995S)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 3

NOTE : Only group I cations are precipitated by dil. HCl

Only PbCl2 and Hg2Cl2 will precipitate as Pb2+ and Hg22+ as first group basic radicals and their solubility product is less than the other radicals.
NOTE : dil. HCl is the first group reagent.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 4

Identify the correct order of solubility of Na2S, CuS and ZnS in aqueous medium (2002S)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 4

Sodium salts are highly soluble. Cu2+ belongs to the IInd group in salt analysis and is precipitated as CuS, whereas Zn2+ belongs to the IV group and is precipitated as ZnS after CuS because of higher Ksp of ZnS.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 5

An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulfide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a (2002S)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 5

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 6

A gas 'X' is passed th rough water to form a satur ated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas 'Y'. Identify 'X' and 'Y'. (2002S)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 6

Since the saturated aqueous solution of (X) give white ppt with AgNO3, so (X) may be Cl2. Hence

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 7

[X] + H2SO4 —→ [Y] a colourless gas with irritating smell, [Y] + K2Cr2O7 + H2SO4 —→ green solution. [X] and [Y] are:(2003S)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 7

SO2 and H2S, both being reducing agents,  can turn acidified dichromate solution green. SO2 can be obtained by the action of acid upon sulphite, while H2S is evolved by the action of acid upon sulphide.
However, SO2 has a burning sulphur smell which is irritating. H2S has rotten egg like smell.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 8

A solution which is 10-3 M each in Mn2+, Fe2+, Zn2+ and Hg2+ is treated with 10-16 M sulphide ion. If Ksp of MnS, FeS, ZnS and HgS are 10-15, 10-23, 10-20 and 10-54 respectively, which one will precipitate first? (2003S)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 8

TIPS/Formulae : For precipitation, Ionic product > solubility product HgS having the lowest Ksp among the given compounds will precipitate first.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 9

A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI is converted into orange colour solution. The cation of the metal nitrate is (2005S)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 9

The metal ion is Bi3+.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 10

A solution when diluted with H2O and boiled, gives a white precipitate. On addition of excess NH4Cl/NH4OH, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which disolves in NH4OH/NH4Cl (2006 - 3M, –1)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 10

Precipitate of Zn(OH)2 formed at initial stage dissolves in excess of NH4OH due to the formation of tetrammine Zn (II) complex.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 11

A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is (2007)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 11

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 12

Passing H2S gas into a mixture of Mn2+, Ni2+, Cu2+ and Hg2+ ions in an acidified aqueous solution precipitates (2011)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 12

In presence of acid, ionisation of H2S is supressed, so less number of S2– are furnished. Hence only those sulphides are precipitated which has low solubility product (Ksp); thus only CuS and HgS are precipitated.

Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 13

Upon treatment with ammoniacal H2S, the metalion that precipitates as a sulfide is   (JEE Adv. 2013)

Detailed Solution for Test: Single Correct MCQs: Analytical Chemistry | JEE Advanced - Question 13

The group reagent of fourth group is ammoniacal H2S by which  Zn2+ ion will be precipitated as ZnS, whereas Fe3+ ion and Al3+ ions will be precipitated as hydroxides.

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