Principles Related to Practical Chemistry

In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound (Aqueous tension at 300 K = 15 mm Hg) is %.

1. 20.87
2. 12.57
3. 1.257
4. 18.67

Formation of Na4[Fe(CN)5NOS], a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of:

1. Sulphide ion
2. Sulphite ion
3. Sulphate ion
4. Sodium ion

The steam volatile compounds among the following are : Choose the correct answer from the options given below :

1. (B) and (D) Only
2. (A), (B) and (C) Only
3. (A) and (B) Only
4. (A) and (C) Only

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

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

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

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

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is

1. Cr3+
2. Ti3+
3. Ni2+
4. Mn2+

The purification method based on the following physical transformation is : (X)Solid Heat (X)Vapour Cool (X)Solid

1. Extraction
2. Crystallization
3. Distillation
4. Sublimation

Identify the inorganic sulphides that are yellow in colour : Choose the correct answer from the options given below :

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

Given below are two statements I and II. In the light of the above statements, choose the correct answer from the options given below

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

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

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

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

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.

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

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.

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

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

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

1. Both Statement I and Statement II are correct
2. Statement I is incorrect but Statement II is correct
3. Both Statement I and Statement II are incorrect
4. Statement I is correct but Statement II is incorrect

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

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

Lassaigne's test is used for detection of :

1. Phosphorous and halogens only
2. Nitrogen, Sulphur and Phosphorous only
3. Nitrogen, Sulphur, phosphorous and halogens
4. Nitrogen and Sulphur only

The compound that is white in color is

1. ammonium sulphide
2. ammonium arsenomolybdate
3. lead iodide
4. lead sulphate