Home
Current Affairs January 2024

What is the correct answer?

4

Calcination of gypsum produces

A. Plaster of Paris

B. Salt cake

C. Nitre cake

D. Lime

Correct Answer :

A. Plaster of Paris


Related Questions

What is the correct answer?

4

The process used for the manufacture of ethyl alcohol from molasses is

A. Distillation

B. Dehydration

C. Dehydrogenation

D. None of these

What is the correct answer?

4

Which of the following is not required in the manufacture of soda ash by Solvay process?

A. Ammonia

B. Limestone

C. Nitric acid

D. None of these

What is the correct answer?

4

Chemical formula of 'salt cake' is

A. Na2SO4

B. CaSO4

C. MgSO4

D. BaSO4

What is the correct answer?

4

Trinitrotoluene (TNT), an explosive, is made by the nitration of

A. Nitrobenzene

B. Toluene

C. Nitrotoluene

D. Benzene

What is the correct answer?

4

Fusel oil is a/an

A. Essential oil

B. Extract from medicinal herbs

C. Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).

D. None of these

What is the correct answer?

4

Which is a high grade pulp?

A. Rag pulp

B. Mechanical pulp

C. Sulphate pulp

D. Sulphite pulp

What is the correct answer?

4

Main use of hydrazine is

A. As a rocket fuel

B. In water treatment

C. As a disinfectant

D. As fire retardant

What is the correct answer?

4

Hydrogen gas is not produced commercially (for nitrogenous fertiliser manufacture) by

A. Iron-steam reaction

B. Electrolysis of water

C. Steam reforming of naphtha

D. Its cryogenic separation from coke oven gas

What is the correct answer?

4

Cumene (isopropyl benzene) is made by

A. Oxidation of naphthalene

B. Propylene alkylation of benzene

C. Polymerisation of a mixture of benzene & propylene

D. None of these

What is the correct answer?

4

Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

A. High cost of mercury

B. High specific gravity of mercury

C. Non-availability of high purity mercury

D. Pollution of water stream by mercury

What is the correct answer?

4

Anion exchanger is regenerated usually with

A. NaOH

B. H2SO4

C. Hydrazine

D. Alum solution

What is the correct answer?

4

The type of high refractive index glass used in optical instruments is __________ glass.

A. Pyrex

B. Flint

C. Crookes

D. None of these

What is the correct answer?

4

Which of the following processes can remove both temporary as well as permanent hardness of water?

A. Filtration

B. Boiling

C. Distillation

D. None of these

What is the correct answer?

4

Isopropyl benzene produced by alkylation of benzene with propylene is known as

A. Neoprene

B. Cumene

C. Gelatin

D. Mercaptans

What is the correct answer?

4

Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of

A. Nitric acid

B. Hydrochloric acid

C. Methyl alcohol

D. Formic acid

What is the correct answer?

4

Which of the following is not an abrasive material?

A. Bakelite

B. Pumice

C. Corundum

D. Carborundum

What is the correct answer?

4

Fish contains about __________ percent oil.

A. 5

B. 10

C. 20

D. 35

What is the correct answer?

4

The most commonly used substance to speed up the sedimentation of sewage is

A. Lime

B. Sulphuric acid

C. Chlorine

D. Sodium bisulphite

What is the correct answer?

4

Which allotrope of sulphur is insoluble in carbon disulphide?

A. Rhombic sulphur

B. Monoclinic sulphur

C. Plastic sulphur

D. Milk of sulphur

What is the correct answer?

4

Viscosity index improver (like polystyrene or polyisobutylene) is added to lubricant to

A. Reduce its viscosity

B. Increase its viscosity

C. Reduce the variation in its viscosity with temperature

D. Increase the variation in its viscosity with temperature

What is the correct answer?

4

Styrene is produced from ethyl benzene by the process of

A. Dehydrogenation

B. Oxidation

C. Alkylation

D. Dehydration

What is the correct answer?

4

The most stable allotropic form of phosphorous is the __________ phosphorous.

A. White

B. Black

C. Yellow

D. Red

What is the correct answer?

4

Setting of plaster of Paris is accompanied with

A. Hydration

B. Dehydration

C. Hydrolysis

D. Loss of CO2

What is the correct answer?

4

Naphthols are derivates of

A. Methyl amine

B. Naphthalene

C. Phenol

D. Xylene

What is the correct answer?

4

Na2CO3.10H2O is called

A. Washing soda

B. Soda ash

C. Slaked lime

D. Quicklime

What is the correct answer?

4

Pick out the wrong statement.

A. Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate

B. Glass is decolorized during its manufacture by adding antimony oxide, manganese dioxide or arsenic oxide

C. Ordinary glass is represented chemically by Na2O . CaO . 6SiO2

D. Red color is imparted to glass by addition of arsenic oxide

What is the correct answer?

4

Pick out the wrong statement.

A. DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction

B. Chloral is obtained by the chlorination of ethyl alcohol

C. Insecticides acting on the insects through the respiratory system are called fumigants

D. Benzene hexachloride is not a contact insecticide

What is the correct answer?

4

Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have

A. High electrical insulation properties

B. Sharp melting points

C. Low co-efficient of thermal expansion

D. Compressive strength much greater than their tensile strengths

What is the correct answer?

4

Which of the following sugars is the sweetest?

A. Glucose

B. Fructose

C. Sucrose

D. Lactose

What is the correct answer?

4

Pick out the wrong statement.

A. Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye respectively

B. Protein catalysts are called enzymes

C. The rate of chemical reaction is independent of the concentration of reactants at high concentration of enzymes

D. Total sugar content in molasses is about 10%