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MCQs 1: Bitterns is a/an_________________?

Unsaturated fat Starting material for the production of iodine By-product of chlor-alkali industry None of these
Answer Explanation

MCQs 2: Permanent hardness of water can be removed by____________________?

Simply boiling Adding alum Passing it through cation & anion exchangers All (A), B. and (C)
Answer Explanation

MCQs 3: The yield of tar from high temperature carbonisation of dry coal is about _______________ percent?

3 12 22 0.3
Answer Explanation

MCQs 4: Main product in calcium carbide-water reaction is___________________?

Ca(OH)2 C2H2 CO2 CaCO3
Answer Explanation

MCQs 5: The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to___________________?

Avoid mechanical weakening of fibre Remove lignin by way of crystallisation Increase the cellulose content None of these
Answer Explanation

MCQs 6: Thermoplastic materials_____________________?

Do not soften on application of heat Are heavily branched molecules Are solvent insoluble None of these
Answer Explanation

MCQs 7: Flexible foam (for mattresses) is usually made of_____________________?

PVC Silicone Polyurethanes Polyamides
Answer Explanation

MCQs 8: Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo ?

Depithing Digestion Bleaching None of these
Answer Explanation

MCQs 9: The most widely used coagulant for removing suspended impurities from water is__________________?

Bleaching powder Chlorine Calcium sulphate Alum
Answer Explanation

MCQs 10: Iron ore hematite is concentrated using ____________________?

Electromagnetic separation mainly Gravity separation Froth floatation Roasting
Answer Explanation

MCQs 11: Which of the following is an unsaturated fatty acid ?

Lauric acid Palmitic acid Stearic acid Oleic acid
Answer Explanation

MCQs 12: Percentage of glycerine present in the spent lye obtained during soap manufacture is about________________?

0.5 5 20 35
Answer Explanation

MCQs 13: High purity nitrogen is used in__________________?

Making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils Fire fighting purposes Both A. & B. Neither A. nor (B)
Answer Explanation

MCQs 14: The main use of HCl is in the___________________?

Drilling of petroleum wells and pickling of steel sheets Manufacture of cationic detergent Treatment of spent fuel of nuclear reactor None of these
Answer Explanation

MCQs 15: Sand and ______________ is fused at 1300°C, to produce sodium silicate ?

Limestone Soda ash Coke Sodium sulphate
Answer Explanation

MCQs 16: The chamber process is______________________?

Preferred over contact process for producing 98 to 100% H2SO4 and various oleums Non-catalytic and operates only on pyrites A batch process for directly producing high strength (98 to 100%) H2SO4 None of these
Answer Explanation

MCQs 17: Hydrophilic group of a soap or detergent solution is____________________?

Water hating Soil loving Water loving None of these
Answer Explanation

MCQs 18: Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about ______________ °C ?

-83 -183 -196 -218
Answer Explanation

MCQs 19: Haemoglobin is a/an____________________?

Amino acid Biological catalyst Protein Enzyme
Answer Explanation

MCQs 20: Esterification reaction produces _________________?

Detergent Vanaspati Soap Mercaptans
Answer Explanation

MCQs 21: Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction ?

Oxidation of Na+ ions Oxidation of Cl- ions Reduction of Na+ ions Reduction of Cl- ions
Answer Explanation

MCQs 22: Sulphur addition in soap is done to _____________________?

Improve the soap texture Cure pimples & dandruff Fasten lather formation Increase its cleansing action
Answer Explanation

MCQs 23: Glass is__________________?

Mainly CaO Subjected to galvanising A super cooled liquid All A , B. and C.
Answer Explanation

MCQs 24: In sulphate pulp manufacture, the pressure and temperature in the digestor is____________________?

10 atm., 800 °C 10 atm., 170-180°C 1 atm., 170 – 180°C 1 atm., 800°C
Answer Explanation

MCQs 25: The basic constituent of vegetable oils is ___________________?

Triglyceride Fatty acids Fatty alcohol Mono esters
Answer Explanation

MCQs 26: Fusion of bauxite and ________________ produces high alumina cement?

Alum Limestone Coke Quartz
Answer Explanation

MCQs 27: ____________ are used as corrosion inhibitor for iron & steel in aqueous solutions ?

Phosphates Chromates Sulphates Bi-carbonates
Answer Explanation

MCQs 28: Which is the main reducing agent during production of iron from iron ore in a blast furnace ?

C CO CO2 H2
Answer Explanation

MCQs 29: Which of the following is not responsible for causing permanent hardness of water ?

Ca(HCO3)2 CaCl2 MgCl2 None of these
Answer Explanation

MCQs 30: Which of the following contains least amount of N2 ?

Coke oven gas Blast furnace gas Producer gas Water gas (blue gas)
Answer Explanation

MCQs 31: Oxidation of SO2 to SO3 is favoured by______________________?

Low temperature and low pressure Low temperature and high pressure High temperature and low pressure High temperature and high pressure
Answer Explanation

MCQs 32: Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at _____________ °C ?

15-30 90-100 250-300 < 0
Answer Explanation

MCQs 33: Paper pulp produced by Kraft/sulphate process is__________________ ?

Bleached easily Dull white in color Strong fibrous Dark colored
Answer Explanation

MCQs 34: White phosphorous is stored under water, because __________________?

It does not react with water It is poisonous Its kindling temperature in dry air is very low It is unstable
Answer Explanation

MCQs 35: Styrene is produced from ethyl benzene by the process of________________?

Dehydrogenation Oxidation Alkylation Dehydration
Answer Explanation

MCQs 36: Pure rectified spirit contains about _________________ percent alcohol?

45 70 95 99.5
Answer Explanation

MCQs 37: The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is _________________?

Dilute H2SO4 Oleum Ultraviolet light None of these
Answer Explanation

MCQs 38: Solvay process as compared to dual process (i.e. modified Solvay process) ?

Can use low grade brine Has less corrosion problems Involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl Both B. and C.
Answer Explanation

MCQs 39: Insulin is an __________________ drug?

Anti-malarial Anti-TB Antibiotic None of these
Answer Explanation

MCQs 40: Molasses is the starting material for the production of ___________________ ?

Alcohol Essential oil Fatty acids Massecuite
Answer Explanation

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