511. Na₂CO₃ is called
Washing soda
Soda ash
Plaster of paris
Calcite
✅ The correct answer is option B.
Chemical Process MCQs
512. Which of the following impurities in feed water for high pressure boiler is the most detrimental?
Silica
Dissolved oxygen
Suspended salt
Dissolved salt
✅ The correct answer is option A.
513. L.D. converter is used in the production of
Pig iron
Steel
Copper
Zinc
✅ The correct answer is option B.
514. Sulphuric acid is mainly used in the __________ industry.
Fertiliser
Steel
Paper
Paint
✅ The correct answer is option A.
515. Dechlorination of treated water is necessary to
Remove residual turbidity
Reduce the bacterial load on filter
Control taste and odour
Remove chlorinous taste
✅ The correct answer is option D.
516. Parathion and Malathion are
Pesticides
Plasticisers for unsaturated polysters
Pain-relieving drugs (analgesic)
Tranquilisers
✅ The correct answer is option A.
517. More than 100 percent of __________ is present in oleum.
SO₃
H₂SO₄
H₂SO₃
SO₂
✅ The correct answer is option B.
518. Which of the following is the main constituent of the mother liquor produced in salt industry?
Quick lime
Glauber’s salt
Salt petre
Bromine
✅ The correct answer is option D.
519. Coagulant is used __________ filtration.
Before
After
During
To avoid
✅ The correct answer is option A.