Questions and answers for exam Preparation

MCQs

Total Questions : 3103 | Page 34 of 311 pages

Question 331. Which of the following is used as a binding material in soap to improve soap texture?

Rosin
Borax
Benzyl acetate
Sodium carbonate

Discuss Question

Answer: Option B. -> Borax

Question 332. Soaps remove dirt by

Increasing the surface tension
Decreasing wettability
Supplying hydrophyllic group
None of these

Discuss Question

Answer: Option D. -> None of these

Question 333. Which allotrope of sulphur is insoluble in carbon disulphide?

Rhombic sulphur
Monoclinic sulphur
Plastic sulphur
Milk of sulphur

Discuss Question

Answer: Option C. -> Plastic sulphur

Question 334. Pick out the wrong statement.

Strongly caking coal should not be used in the Lurgi gasifier
Acetylene gas can not be used for illumination purpose
Water gas is called blue gas because of the color of the flame, when it is burnt
Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels

Discuss Question

Answer: Option B. -> Acetylene gas can not be used for illumination purpose

Question 335. Solvent extracted oil

Has low free fatty acid content
Is odourless
Has more of unsaturates
None of these

Discuss Question

Answer: Option D. -> None of these

Question 336. Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate

Is prone to thermal decomposition
Has high water solubility and is unstable
Is soluble in ammonium chloride and potassium chloride solution
All of the above

Discuss Question

Answer: Option C. -> Is soluble in ammonium chloride and potassium chloride solution

Question 337. Transparent soaps (e.g. Pears) are

Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
Metallic soaps with frothing agent and free stearic acid to achieve transparency
Metallic soaps with frothing agent from which glycerine has not been recovered
None of these

Discuss Question

Answer: Option A. -> Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency

Question 338. Most widely and commonly used coagulant for the removal of suspended impurities in water is