Heating of _______________ to 120°C, produces plaster of paris ?
A. Blue vitriol
B. Gypsum
C. Calcium silicate
D. Calcium sulphate
Chemical Process
Which of the following is used as a binding material in soap to improve soap texture ?
Which of the following is used as a binding material in soap to improve soap texture ?
A. Rosin
B. Borax
C. Benzyl acetate
D. Sodium carbonate
Glauber’s salt is chemically represented by____________________?
Glauber’s salt is chemically represented by____________________?
A. Na2SO4.10H2O
B. CaCl(OCl)
C. CaSO4.H2O
D. (NH4)2SO4
Main constituents of Portland cement are calcium aluminate and__________________?
Main constituents of Portland cement are calcium aluminate and__________________?
A. Gypsum
B. Silicates
C. Sodium silicate
D. Carbonates
The purpose of adding Na2CO3 to water of low alkalinity is to__________________?
The purpose of adding Na2CO3 to water of low alkalinity is to__________________?
A. Permit the use of alum as a coagulant
B. Increase the softening capacity of zeolite
C. Facilitate easy regeneration of zeolite
D. All A , B. and C.
Zeolite used in water softening process (cation exchange) is regenerated by washing with___________________?
Zeolite used in water softening process (cation exchange) is regenerated by washing with___________________?
A. Brine
B. Chloramines
C. Sodium bisulphite
D. Liquid chlorines
The product obtained on mixing calcium oxide with water is called __________________?
The product obtained on mixing calcium oxide with water is called __________________?
A. Quicklime
B. Slaked lime
C. Milk of lime
D. None of these
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement ?
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement ?
A. Xanthates
B. Stearic acid
C. Calcium & aluminium stearate
D. Formic acid
Sodium salt of higher molecular weight fatty acid is termed as the ______________________ soap?
Sodium salt of higher molecular weight fatty acid is termed as the ______________________ soap?
A. Hard
B. Soft
C. Metallic
D. Lubricating
Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction__________________?
Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction__________________?
A. Decreases with decrease of thickness of the flakes
B. Increases with the increasing flake size keeg the flake thickness constant
C. Increases considerably with the rise of temperature
D. Decreases as the moisture content of flakes increases