Chemical Process Mcqs - Set 12

1)   Low purity oxygen is used for____________________?

a. L.D. steel making
b. Cutting and welding of metals
c. Medicinal purposes
d. Chemical oxidation processes
Answer  Explanation 

ANSWER: Chemical oxidation processes

Explanation:
No explanation is available for this question!


2)   Highly porous refractory bricks are ____________________?

a. Less susceptible to chemical attack by molten fluxes and gases etc
b. Very strong
c. Having very high thermal conductivity
d. None of these
Answer  Explanation 

ANSWER: None of these

Explanation:
No explanation is available for this question!


3)   The temperature in the calcium carbide furnace is _______________ °C ?

a. 200-300
b. 700-850
c. 2000-2200
d. 4000-4500
Answer  Explanation 

ANSWER: 2000-2200

Explanation:
No explanation is available for this question!


4)   Sodium chloride content in sea water is about _______________ gms/liter?

a. 2
b. 10
c. 25
d. 50
Answer  Explanation 

ANSWER: 25

Explanation:
No explanation is available for this question!


5)   Lindane is____________________?

a. Not a fumigant
b. BHC (Benzene Hexachloride) containing 99% γ-isomer
c. A by-product of BHC manufacture
d. Both B. and C.
Answer  Explanation 

ANSWER: BHC (Benzene Hexachloride) containing 99% γ-isomer

Explanation:
No explanation is available for this question!


6)   Carboxymethyl cellulose (CMC) is added in detergents to act as a/an___________________?

a. Surfactant
b. Builder
c. Optical brightening agent
d. Anti soil redeposition agent
Answer  Explanation 

ANSWER: Anti soil redeposition agent

Explanation:
No explanation is available for this question!


7)   Kopper-Totzek coal gasifier_________________?

a. Can give ammonia synthesis gas (H2 + N2)
b. Is a moving bed reactor
c. Cannot use coking coal
d. Operate at very high pressure
Answer  Explanation 

ANSWER: Can give ammonia synthesis gas (H2 + N2)

Explanation:
No explanation is available for this question!


8)   Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about _____________ percent?

a. 75
b. < 10
c. > 30
d. 50
Answer  Explanation 

ANSWER: < 10

Explanation:
No explanation is available for this question!


9)   ‘Synthesis gas’ meant for the synthesis of organic compound is a variable mixture of ____________________?

a. N2 & H2
b. CO2 & H2
c. CO & H2
d. C & H2
Answer  Explanation 

ANSWER: CO & H2

Explanation:
No explanation is available for this question!


10)   Starting raw material for the manufacture of Maleic anhydride is___________________?

a. n-butene
b. Benzene
c. Either A. or B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Either A. or B.

Explanation:
No explanation is available for this question!


11)   Polyvinyl chloride (PVC) is____________________?

a. A thermosetting material
b. A condensation polymerisation product
c. Made by employing emulsion polymerisation
d. None of these
Answer  Explanation 

ANSWER: Made by employing emulsion polymerisation

Explanation:
No explanation is available for this question!


12)   The basic difference between vegetable oils and fats is in their ___________________?

a. Density
b. Chemical properties
c. Physical state
d. Composition
Answer  Explanation 

ANSWER: Physical state

Explanation:
No explanation is available for this question!


13)   Removal of dirt/soil by soaps or detergent does not involve the _______________ of soil ?

a. Emulsification
b. Dispersion
c. Precipitation
d. Wetting
Answer  Explanation 

ANSWER: Precipitation

Explanation:
No explanation is available for this question!


14)   Drinking (potable) water treatment does not involve __________________?

a. Coagulation
b. Sedimentation
c. Softening
d. Disinfection
Answer  Explanation 

ANSWER: Softening

Explanation:
No explanation is available for this question!


15)   Thorium is mainly used _______________?

a. For the manufacture of gas mantles
b. As a fissile fuel in a nuclear reactor
c. In the manufacture of hydrogen bomb
d. In the treatment of cancer
Answer  Explanation 

ANSWER: For the manufacture of gas mantles

Explanation:
No explanation is available for this question!


16)   Which oil is preferred for paint manufacture ?

a. Drying oil
b. Non-drying oil
c. Semi-drying oil
d. Saturated oil
Answer  Explanation 

ANSWER: Drying oil

Explanation:
No explanation is available for this question!


17)   Pick out the wrong statement pertaining to nitric acid ?

a. About 90% of nitric acid is manufactured by Ostwald’s process
b. It is a strong mono basic acid which reacts with almost all the metals except noble metals
c. Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO2)
d. Arc process of nitric acid manufacture is economical as compared to Ostwald’s process
Answer  Explanation 

ANSWER: Arc process of nitric acid manufacture is economical as compared to Ostwald’s process

Explanation:
No explanation is available for this question!


18)   Tall oil obtained as a by-product from the black liquor recovery is________________?

a. A black, sticky & viscous liquid
b. Used in the manufacture of greases, emulsions & soaps
c. Composed mainly of rosin & fatty acids
d. All A , B. & C.
Answer  Explanation 

ANSWER: All A , B. & C.

Explanation:
No explanation is available for this question!


19)   Magnesium and calcium ______________ cause temporary hardness of water ?

a. Carbonates
b. Bicarbonates
c. Phosphates
d. Sulphates
Answer  Explanation 

ANSWER: Bicarbonates

Explanation:
No explanation is available for this question!


20)   Which of the following, when pyrolysed, produces Perchloroethylene ?

a. Ethylene dichloride
b. Chlorobenzene
c. Carbon tetrachloride
d. Chlorinated paraffin
Answer  Explanation 

ANSWER: Carbon tetrachloride

Explanation:
No explanation is available for this question!


21)   Pick out the exothermic reaction out of the following ?

a. C + H2O = CO + H2
b. CaC2 + H2O = Ca(OH)2 + C2H2
c. MgCO3 = MgO + CO2
d. All (A), B. and (C)
Answer  Explanation 

ANSWER: CaC2 + H2O = Ca(OH)2 + C2H2

Explanation:
No explanation is available for this question!


22)   ______________ paper is used in the manufacture of newsprint paper ?

a. Ground-wood
b. Board
c. Tissue
d. Wrapping
Answer  Explanation 

ANSWER: Ground-wood

Explanation:
No explanation is available for this question!


23)   Which of the following is the main constituent of the mother liquor produced in salt industry ?

a. Quick lime
b. Glauber’s salt
c. Salt petre
d. Bromine
Answer  Explanation 

ANSWER: Bromine

Explanation:
No explanation is available for this question!


24)   Concentration of hydrogen peroxide is done by_____________________?

a. Crystallisation
b. Vacuum crystallisation
c. Atmospheric distillation
d. Dehydration
Answer  Explanation 

ANSWER: Vacuum crystallisation

Explanation:
No explanation is available for this question!


25)   Bakelite is chemically known as_____________________?

a. Polyvinyl chloride (PVC)
b. Polybutadiene
c. Phenol formaldehyde
d. Polyurethane
Answer  Explanation 

ANSWER: Phenol formaldehyde

Explanation:
No explanation is available for this question!


26)   Terylene is__________________?

a. Same as Dacron
b. A polyester
c. Both A. & B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Both A. & B.

Explanation:
No explanation is available for this question!


27)   Unsaturated oils compared to saturated oils have___________________?

a. Lower melting point & higher reactivity to oxygen
b. Higher melting point & higher reactivity to oxygen
c. Lower melting point & lower reactivity to oxygen
d. Higher melting point & lower reactivity to oxygen
Answer  Explanation 

ANSWER: Lower melting point & higher reactivity to oxygen

Explanation:
No explanation is available for this question!


28)   Production of one ton of dry paper pulp requires about ___________________ tons of bamboo or wood?

a. 1
b. 2.5
c. 5
d. 10
Answer  Explanation 

ANSWER: 2.5

Explanation:
No explanation is available for this question!


29)   Wax is a___________________?

a. Mixture of glycerides
b. Mixture of esters of polyhydric alcohols excepting glycerine
c. Liquid at room temperature
d. Mixture of glycerides of fatty acids
Answer  Explanation 

ANSWER: Mixture of esters of polyhydric alcohols excepting glycerine

Explanation:
No explanation is available for this question!


30)   Ordinary glass is not a/an_________________?

a. Amorphous isotropic material
b. Supercooled liquid
c. Material with sharp definite melting point
d. Electrical insulator
Answer  Explanation 

ANSWER: Material with sharp definite melting point

Explanation:
No explanation is available for this question!


31)   Hydrochloric acid is also known as_________________?

a. Oil of vitriol
b. Muriatic acid
c. Strong organic acid
d. Green acid
Answer  Explanation 

ANSWER: Muriatic acid

Explanation:
No explanation is available for this question!


32)   Higher viscosity index of a lubricating oil denotes_______________?

a. Less changes in fluidity of oil with temperature
b. Substantially high change in fluidity of oil with temperature
c. Its unsuitability under varying temperature conditions
d. None of these
Answer  Explanation 

ANSWER: Less changes in fluidity of oil with temperature

Explanation:
No explanation is available for this question!


33)   Chloral is used in the manufacture of__________________?

a. DDT
b. BHC
c. Parathion
d. None of these
Answer  Explanation 

ANSWER: DDT

Explanation:
No explanation is available for this question!


34)   Reverse osmosis is normally used for the_______________?

a. Separation of isotopes of uranium from gaseous uranium hexafluoride
b. Separation of helium from natural gas
c. Desalination of brackish water to produce potable (drinking) water
d. Purification of oxygen
Answer  Explanation 

ANSWER: Desalination of brackish water to produce potable (drinking) water

Explanation:
No explanation is available for this question!


35)   Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is ____________ °C?

a. -5 to 0
b. 5 to 10
c. 30 to 50
d. 75 to 80
Answer  Explanation 

ANSWER: 30 to 50

Explanation:
No explanation is available for this question!


36)   Transparent soaps (e.g. Pears) are____________________?

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

ANSWER: Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency

Explanation:
No explanation is available for this question!


37)   The biochemical treatment applied to sewage effluents is a process of__________________?

a. Dehydration
b. Reduction
c. Oxidation
d. Polymerisation
Answer  Explanation 

ANSWER: Oxidation

Explanation:
No explanation is available for this question!


38)   At very high concentration of enzymes, the rate of fermentation chemical reaction is _____________ the concentration of reactants?

a. Independent of
b. Directly proportional to
c. Inversely proportional to
d. Proportional to the square of
Answer  Explanation 

ANSWER: Independent of

Explanation:
No explanation is available for this question!


39)   ______________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace?

a. Bauxite
b. Limestone
c. Quartz
d. Manganese
Answer  Explanation 

ANSWER: Limestone

Explanation:
No explanation is available for this question!


40)   Dry ice (solidified CO2) is used for the___________________?

a. Storage & shipment of frozen foods and ice-creams
b. Liquefaction of permanent gases
c. Liquefaction of natural gas
d. None of these
Answer  Explanation 

ANSWER: Storage & shipment of frozen foods and ice-creams

Explanation:
No explanation is available for this question!