Principles Related to Practical Chemistry

Find the compound 'A' from the following reaction sequences. A aqua-regiaB [(2) AcOH](1) KNO2, NH4OH yellow ppt

1. NiS
2. MnS
3. ZnS
4. CoS

In Carius method of estimation of halogen, 0.25 g of an organic compound gave 0.15 g of silver bromide (AgBr). The percentage of Bromine in the organic compound is 10-1\% (Nearest integer). (Given : Molar mass of Ag is 108 and Br is 80 g mol-1)

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below

1. Both Statement I and Statement II are false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Statement I is true but Statement II is false

During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is %. (Given molar mass in g mol-1 of Ba : 137, S : 32, O : 16)

Identify A, B and C in the given below reaction sequence [figure]

1. PbCl2, PbSO4, PbCrO4
2. PbS, PbSO4, Pb(CH3COO)2
3. PbS, PbSO4, PbCrO4
4. PbCl2, Pb(SO4)2, PbCrO4

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is %. (Given : molar mass in g mol-1 of Ag:108, Cl:35.5)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are false
2. Statement I is true but Statement II is false
3. Statement I is false but Statement II is true
4. Both Statement I and Statement II are true

Identify the incorrect statements regarding primary standard of titrimetric analysis. Choose the correct answer from the options given below :

1. (C) and (E) only
2. (A) and (B) only
3. (B) and (E) only
4. (C) and (D) only

Methods used for purification of organic compounds are based on :

1. neither on nature of compound nor on the impurity present.
2. presence of impurity only.
3. nature of compound and presence of impurity.
4. nature of compound only.

Match List I with List II Choose the correct answer from the options given below:

1. A-II, B-III, C-IV, D-I
2. A-III, B-IV, C-I, D-II
3. A-I, B-II, C-III, D-IV
4. A-IV, B-I, C-II, D-III

[figure] In the given TLC, the distance of spot A & B are 5 cm & 7 cm, from the bottom of TLC plate, respectively. Rf value of B is x 10-1 times more than A. The value of x is .

Consider the following test for a group-IV cation. M2+ + H2S A (Black precipitate) + byproduct A + aqua regia B + NOCl + S + H2O B + KNO2 + CH3COOH C + byproduct The spin-only magnetic moment value of the metal complex C is BM (Nearest integer)

Match List I with List II Choose the correct answer from the options given below:

1. A-III, B-I, C-IV, D-II
2. A-III, B-IV, C-I, D-II
3. A-III, B-II, C-IV, D-I
4. A-III, B-I, C-II, D-IV

Match List I with List II Choose the correct answer from the options given below:

1. A-IV, B-I, C-II, D-III
2. A-I, B-II, C-III, D-IV
3. A-II, B-III, C-IV, D-I
4. A-III, B-I, C-II, D-IV

Match List I with List II Choose the correct answer from the options given below :

1. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
2. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
3. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
4. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are true
2. Both Statement I and Statement II are false
3. Statement I is true but Statement II is false
4. Statement I is false but Statement II is true

In qualitative test for identification of presence of phosphorus, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is :

1. Na3PO4 12MoO3
2. (NH4)3PO4 12(NH4)2MoO4
3. MoPO4 21NH4NO3
4. (NH4)3PO4 12MoO3

Match List I with List II Choose the correct answer from the options given below:

1. A-III, B-IV, C-I, D-II
2. A-III, B-IV, C-II, D-I
3. A-IV, B-III, C-II, D-I
4. A-IV, B-III, C-I, D-II

Which of the following statements are correct? Choose the most appropriate answer from the options given below :

1. A, C, D only
2. B, C, D only
3. A, B, D only
4. A, B, C only

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in NH4OH solution when sodium carbonate extract was first acidified with dil. HNO3 and then AgNO3 solution was added. This indicates presence of :

1. I-
2. CO32-
3. Cl-
4. Br-

The correct statement among the following, for a "chromatography" purification method is :

1. Rf of a polar compound is smaller than that of a non-polar compound.
2. Non-polar compounds are retained at top and polar compounds come down in column chromatography.
3. Organic compounds run faster than solvent in the thin layer chromatographic plate.
4. Rf is an integral value.

Consider the following reactions NiS + HNO3 + HCl A + NO + S + H2O [figure] The number of protons that do not involve in hydrogen bonding in the product B is .

[figure] In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is BM (Nearest integer) [Given atomic number of Cu = 29, Ni = 28, Mn = 25, Fe = 26]

While preparing crystals of Mohr's salt, dil H2SO4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H2SO4 is added here to :

1. prevent the hydrolysis of ferrous sulphate
2. prevent the hydrolysis of ammonium sulphate
3. increase the rate of formation of crystals
4. make the medium strongly acidic

Using the given figure, the ratio of Rf values of sample A and sample C is x 10-2. Value of x is . [figure]

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :

1. decrease concentration of -OH ions
2. increase concentration of Cl- ions
3. prevent interference by phosphate ions
4. increase concentration of NH4+ ions

Which of the following nitrogen containing compound does not give Lassaigne's test ?

1. Glycine
2. Phenyl hydrazine
3. Urea
4. Hydrazine

When MnO2 and H2SO4 are added to a salt (A), a greenish yellow gas is liberated. The salt (A) is :

1. NH4Cl
2. CaI2
3. KNO3
4. NaBr

The adsorbent used in adsorption chromatography is/are - Choose the most appropriate answer from the options given below :

1. C and D only
2. A only
3. B only
4. A and B only

In Kjeldahl's method for estimation of nitrogen, CuSO4 acts as :

1. catalytic agent
2. hydrolysis agent
3. reducing agent
4. oxidising agent