61. Iron ore hametite is concentrated using
Electro magnetic separation mainly
Gravity separation
Froth floatation
Roasting
✅ The correct answer is option B.
Chemical Process MCQs
62. Which is the most suitable dye for synthetic fibres?
Acid dye
Azoic dye
Pigment dye
Mordant dye
✅ The correct answer is option A.
63. Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C.
-5 to 0
5 to 10
30 to 50
75 to 80
✅ The correct answer is option C.
64. Fatty material used in soap making is
Fatty acid
Fatty alcohols
Tallow
Detergents
✅ The correct answer is option C.
65. Boiling of water containing temporary hardness produces
CO₂
CaSO₄
CaHCO₃
None of these
✅ The correct answer is option A.
66. Phthalic anhydride is produced by the oxidation of
Naphthalene
Benzene
Toluene
Aniline
✅ The correct answer is option B.
67. Carborundum consists mainly of
Bauxite
Silicon carbide
Boron carbide
Calcium carbide
✅ The correct answer is option B.
68. RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically
Cyclo trimethylene trinitramine
Trinitro resorcinol
Cyclo tetramethylene tetranitramine
Trinitro benzene
✅ The correct answer is option A.
69. Neoprene is chemically known as
Polybutadiene
Styrene butadiene rubber (SBR)
Polyurathane
Polychloroprene
✅ The correct answer is option D.
70. Phenol formaldehyde resin is used as an adhesive in making
Laminates
Card boxes
Furniture
Books
✅ The correct answer is option A.