111. Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.
25
60-70
150-200
250-300
✅ The correct answer is option B.
Chemical Process MCQs
112. Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively
V₂O₅ & Cr₂O₃
Oxides of nitrogen & Cr₂O₃
V₂O₅ on a porous carrier & oxides of nitrogen
Oxides of nitrogen & V₂O₅ on a porous carrier
✅ The correct answer is option D.
113. Solvent extracted oil
Has low free fatty acid content
Is odourless
Has more of unsaturates
None of these
✅ The correct answer is option D.
114. Alum [Al2(SO₄)₃] is used as a coagulant in water treatment to remove
Colour
Turbidity
Bacteria
All of the above
✅ The correct answer is option D.
115. Hydrogenation of oil does not
Remove double bonds
Raise its melting point
Improve its resistance to oxidation
None of these
✅ The correct answer is option D.
116. Fluorescent dyes are added in detergents to
Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics
Attain distinctiveness from other brands
Act as tarnish inhibitor for metals like German silver
None of these
✅ The correct answer is option A.
118. Enzymes are
Proteins with high molecular weight (around 10, 000)
Derived from living organisms
Catalyst for temperature sensitive reactions
All of the above
✅ The correct answer is option D.
119. A substance produced by a living organism and capable of anti-microbial activity is called a/an
Antibiotic
Antiseptic
Disinfectant
None of these
✅ The correct answer is option A.
120. __________ are added in lacquers to remove film brittleness and to improve adhereness.
Film forming materials
Plasticisers
Diluents
Solvents
✅ The correct answer is option B.