5161. Resistance to fusion of the refractory under a steady rising temperature condition is called
Spalling
Refractoriness
Both A & B
Neither A nor B
✅ The correct answer is option B.
Chemical Engineering
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5162. Viscose rayon
Cannot be made from sulphite pulp
Utilises H₂SO₄, NaOH and CS₂ during its manufacture
Cannot yield textile grade fibre
None of these
✅ The correct answer is option B.
5163. 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
L atm., 800°C
✅ The correct answer is option B.
5164. Catalyst used in the oxidation of benzene to produce maleic anhydride is
V₂O₅
Pt
Ni
Cr
✅ The correct answer is option A.
5165. Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.
CaO
MnO₂
ZnO
FeS
✅ The correct answer is option C.
5166. High temperature carbonisation of coal takes place at __________ °C.
2000
700
1100
< 500
✅ The correct answer is option C.
5167. BHC (Benzene hexachloride) is made by the chlorination of benzene
Which is an addition reaction
Which is a substitution reaction
In absolute dark
In presence of sunlight
✅ The correct answer is option A.
5168. Calgon used in water treatment is chemically
Sodium phosphate
Sodium hexametaphosphate
Calcium phosphate
Tricresyl phosphate
✅ The correct answer is option B.
5169. Antibiotic
Inhibits/destroys the growth of microorganisms
Is used as a pain reliever
Is an antimalarial
Is an anaesthetic
✅ The correct answer is option A.
5170. An alkali metal salt of palmitic acid is known as
Soap
Metallic soap
Detergent
Alkaloid
✅ The correct answer is option B.