Principles Related to Practical Chemistry

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

Rf value for 2-methylpropene in a solvent system (Ethyl acetate + ether) is 0.42. 2-methylpropene is treated with dilute H2SO4 to give major organic product (X). Rf value for (X) in the same solvent system under identical condition will be:

1. 0.42
2. 0.82
3. 0.62
4. 0.12

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

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

Method used for separation of mixture of products (B and C) obtained in the following reaction is [figure]

1. simple distillation
2. sublimation
3. fractional distillation
4. steam distillation

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

A mixture of 1 g each of chlorobenzene, aniline, and benzoic acid is dissolved in 50 mL ethyl acetate and placed in a separating funnel. 5 M NaOH (30 mL) was added in the same funnel. The funnel was shaken vigorously and then kept aside. The ethyl acetate layer in the funnel contains :

1. chlorobenzene and aniline
2. benzoic acid and aniline
3. benzoic acid
4. benzoic acid and chlorobenzene

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

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

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.

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

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.

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

'Adsorption' principle is used for which of the following purification method?

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

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is -

1. distillation
2. steam distillation
3. distillation under reduced pressure
4. crystallisation

Which among the following purification methods is based on the principle of "Solubility" in two different solvents?

1. Distillation
2. Sublimation
3. Column Chromatography
4. Differential Extraction

Chromatographic technique/s based on the principle of differential adsorption is / are Choose the most appropriate answer from the options given below:

1. B only
2. A only
3. A & B only
4. C only

The technique used for purification of steam volatile water immiscible substances is :

1. Fractional distillation
2. Distillation
3. Fractional distillation under reduced pressure
4. Steam distillation