Practical and Analytical Chemistry — JEE Main PYQs

In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?

Given below are two statements :
Statement I: Sulphanilic acid gives esterification test for carboxyl group.
Statement II : Sulphanilic acid gives red colour in
Lassigne's test for extra element detection.
In the light of the above statements, choose the most appropriate answer f …

Which element is not present in Nessler's reagent ?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : An aqueous solution of KOH when for volumetric analysis, its concentration should be checked before the use.

Reason (R) : On aging, KOH solution absorbs at …

In Dumas method for the estimation of ${\mathrm{N}}_2$, the sample is heated with copper oxide and the gas evolved is passed over :

Formulae for Nessler's reagent is:

Match List-I with List-II, match the gas evolved during each reaction.

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Permanganate titrations are not performed in presence of hydrochloric acid.

Reason R: Chlorine is formed as a consequence of oxidation of hydrochloric acid.

In t …

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Thin layer chromatography is an adsorption chromatography.
Reason R: A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatog …

A sample of 0.125 g of an organic compound when analysed by Duma's method yields 22.78 mL of nitrogen gas collected over KOH solution at 280 K and 759 mm Hg . The percentage of nitrogen in the given organic compound is ____. (Nearest integer).
(a) The vapour pressure of water at …

In Carius method of estimation of halogen. 0.45 g of an organic compound gave 0.36 g of AgBr . Find out the percentage of bromine in the compound.
(Molar masses : $\mathrm{AgBr}=188\mathrm{g}{\mathrm{mol}}^{-1}:\mathrm{Br}=80\mathrm{g}{\mathrm{mol}}^{-1}$ )

While estimating the nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0.25 g of the compound neutralized 2.5 mL of $2\mathrm{M}$ ${\mathrm{H}}_2{\mathrm{SO}}_4$. The percentage of nitrogen present in organic compound is _____.

20 mL of 0.02 M hypo solution is used for the titration of 10 mL of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of ${\mathrm{Cu}}^{2+}$ is found to be
____ $\times 10^{-2}\mathrm{M}$ [nearest integer]

Given : …

Match List-I with List-II

List-I (Mixture)
(A) Chloroform & Aniline
(B) Benzoic acid & Napthalene
(C) Water & Aniline
(D) Napthalene & Sodium chloride

List-II (Purification Process)
(I) Steam distillation
(II) Sublimation
(III) Distillation
(IV) Crystallisation

The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are 3.25 cm, 2.08 cm and 1.05 cm respectively. The ratio of $R_f$ values of A to B is ____

Which technique among the following, is most appropriate in separation of a mixture of 100 mg of p-nitrophenol and picric acid?

0.25 g of an organic compound containing chlorine gave 0.40 g of silver chloride in Carius estimation. The percentage of chlorine present in the compound is ______. [in nearest integer]
(Given: Molar mass of Ag is $108{\mathrm{g}\mathrm{mol}}^{-1}$ and that of Cl is …

Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?

The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is

In the estimation of bromine, 0.5 g of an organic compound gave 0.40 g of silver bromide. The percentage of bromine in the given compound is ______ % (nearest integer)
(Relative atomic masses of Ag and Br are 108u and 80u, respectively).

A white precipitate was formed when ${\mathrm{BaCl}}_2$ was added to water extract of an inorganic salt. Further, a gas ' X ' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl . The anion present in the inorganic salt is :

Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of $1\text{ M }{\text{H}}_2{\text{SO}}_4$ solution. The percentage of nitrogen in the compound is ____. (Nearest integer)

Given below are two statements :

Statement I: In 'Lassaigne's Test, when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.
Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in …

Which statement is not true with respect to nitrate ion test?

Which of the following is structure of a separating funnel?

During the qualitative analysis of salt with cation y²⁺, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y²⁺) present respectively are:

In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

$0.2\text{g}$ of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of $\mathrm{N}{}_2$ evolved (at STP) was found to be 22.400 mL. The percentage of nitrogen in the compound is ____. [nearest integer]
(Given: Molar mass of $\mathrm{N}{}_2$ is …

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene.
Reason R: Benzoic acid is soluble in hot water.
In …

During halogen test, sodium fusion extract is boiled with concentrated ${\mathrm{HNO}}_3$ to

In the sulphur estimation, 0.471 g of an organic compound gave 1.44 g of barium sulphate. The percentage of sulphur in the compound is $\_\_\_\_$ %. (Nearest integer)
(Atomic mass of $\mathrm{Ba}=137\mathrm{u}$).

An inorganic compound 'X' on treatment with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ produces brown fumes and gives dark brown ring with ${\mathrm{FeSO}}_4$ in presence of concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$. Also compound 'X' gives precipitate 'Y', when its solution …

In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of:

When 0.15 g of an organic compound was analyzed using carius method for estimation of bromine, 0.2397 g of AgBr was obtained. The percentage of bromine in the organic compound is ______. (Nearest Integer)
(Atomic mass: $\mathrm{Ag}=108,\mathrm{Br}=80$)

Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent ?

0.4 g mixture of $\mathrm{NaOH},{\mathrm{Na}}_2{\mathrm{CO}}_3$ and some inert impurities was first titrated with $\frac{\mathrm{N}}{10}\mathrm{HCl}$ using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and …

Using the provided information in the following paper chromatogram:
Fig: Paper chromatography for compounds A and B. The calculated ${\mathrm{R}}_f$ value of A is _____ $\times 10^{-1}$.

Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?

Given below are two statements:
Statement I: A mixture of chloroform and aniline can be separated by simple distillation.
Statement II: When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point.
In the light of the abo …

Which of the following is 'a' FALSE statement ?
(A) Carius method is used for the estimation of nitrogen in an organic compound.
(B) Carius tube is used in the estimation of sulphur in an organic compound.
(C) Kjeldahl's method is used for the estimation of nitrogen in an organic …

In Carius method for estimation of halogens, 0.2 g of an organic compound gave 0.188 g of AgBr . The percentage of bromine in the compound is ____ . (Nearest integer) [Atomic mass : $\mathrm{Ag}=108,\mathrm{Br}=80$ ]

The number of moles of CuO, that will be utilized in Dumas method for estimating nitrogen in a sample of 57.5 g of $N,N$-dimethylaminopentane is ______ $\times 10^{-2}$. (Nearest integer).

Ceric ammonium nitrate and ${\mathrm{CHCl}}_3$ /alc. KOH are used for the identification of functional groups present in $\_\_\_\_$ and $\_\_\_\_$ respectively.

Match List-I with List-II.

List - I (Metal ion)
(a) ${\mathrm{Mn}}^{2+}$
(b) ${\mathrm{As}}^{3+}$
(c) ${\mathrm{Cu}}^{2+}$
(d) ${\mathrm{Al}}^{3+}$

List - II (Group in Qualitative Analysis)
(i) Group - III
(ii) Group - IIA
(iii) Group - IV
(iv) Group - IIB

Choose the most appropriate …

The transformation occurring in Duma's method is given below : …

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) :
Assertion (A) : A simple distillation can be used to separate a mixture of propanol and propanone.
Reason (R): Two liquids with a difference of more than …

Consider the sulphides $\mathrm{HgS},\mathrm{PbS},\mathrm{CuS},{\mathrm{Sb}}_2{\mathrm{S}}_3,{\mathrm{As}}_2{\mathrm{S}}_3$ and CdS . Number of these sulphides soluble in $50\%{\mathrm{HNO}}_3$ is ____ .

An organic compound is subjected to chlorination to get compound A using 5.0 g of chlorine. When 0.5 g of compound A is reacted with ${\mathrm{AgNO}}_3$ [Carius Method], the percentage of chlorine in compound A is ______ when it forms 0.3849 g of AgCl
(Round off to the Nearest …

Given below are two statements:
Statement I : Retardation factor $({\mathrm{R}}_{\mathrm{f}})$ can be measured in meter / centimeter.
Statement II: ${\mathrm{R}}_{\mathrm{f}}$ value of a compound remains constant in all solvents.
Chose the most appropriate answer from the options giv …

Which one of the following set of elements can be detected using sodium fusion extract?