The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

The Marxists, following a theory of dialectical materialism, contend that man is merely a producing animal who supplies his own needs and whose life is largely . . . . . . . by economic forces.

A

determined

B

subordinated

C

moulded

D

subjugated

If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is

A

$$\frac{{\text{L}}}{{\text{G}}}$$

B

$$\frac{{\text{G}}}{{\text{L}}}$$

C

Always

D

None of these

Unlike the surface of Venus, (A) Titan is largely covered in liquid methane (B) lakes, with solid ground (C) comprising only a fraction of the (D) moon's total area.

A

B

C

D

E

Solvent deoiling process is used for separating oil and soft wax from hard wax. Methyl iso-butyl ketone and methyl ethyl ketone (MEK) are two commonly used deoiling solvents. Use of former as the deoiling solvent has the advantages of the

A

Elimination of solvent drying facility

B

Higher nitration temperature

C

Lower solvent dilution ratio

D

All of the above

'Solvent naphtha' used mostly as a solvent in paints and perfumery is produced by the __________ of virgin naphtha into small boiling range cuts.

A

Steam reforming

B

Distillation

C

Desulphurisation

D

None of these

The vapour pressure of a solution (made by dissolving a solute in a solvent) is __________ that of the pure solvent.

A

Less than

B

More than

C

Equal to

D

Either more or less; depends on the solvent

Selectivity of the solvent used in solvent extraction should be

A

1

B

> 1

C

0

In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres.

A

Polythene

B

PVC

C

Rayon

D

Polyvinyl acetate

If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its

A

Bubble point

B

Saturation temperature

C

Dew point

D

Both B and C

Addition of a non-volatile solute to a solvent produces a __________ in its solvent.

A

Freezing point elevation

B

Boiling point depression

C

Vapor pressure lowering

D

All of the above

The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

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