281. Blue colour is imparted to glass by the addition of
FeSO₄
PbO
CaO
NaOH
✅ The correct answer is option C.
Chemical Process MCQs
282. The basic difference between vegetable oils and fats is in their
Density
Chemical properties
Physical state
Composition
✅ The correct answer is option C.
283. All enzymes are made of
Fats
Carbohydrates
Proteins
Amino acids
✅ The correct answer is option C.
284. Which is a high grade pulp?
Rag pulp
Mechanical pulp
Sulphate pulp
Sulphite pulp
✅ The correct answer is option C.
285. How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?
500°C
750°C
1000°C
1500°C
✅ The correct answer is option C.
286. Magnesium and calcium __________ cause temporary hardness of water.
Carbonates
Bicarbonates
Phosphates
Sulphates
✅ The correct answer is option B.
287. 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
✅ The correct answer is option D.
288. Chloramines are used in water treatment for
Disinfection and control of taste & odour
Corrosion control
Removing turbidity
Control of bacteria
✅ The correct answer is option A.
289. Which of the following is not a food additive?
Citric acid
Invertage
Benzoyl peroxide
Ammonium chloride
✅ The correct answer is option D.
290. The temperature in the calcium carbide furnace is __________ °C.
200-300
700-850
2000-2200
4000-4500
✅ The correct answer is option C.