171. Drinking (potable) water treatment does not involve
Coagulation
Sedimentation
Softening
Disinfection
✅ The correct answer is option C.
Chemical Process MCQs
172. Essential oils are usually obtained using
Steam distillation
Extractive distillation
Solvent extraction
Leaching
✅ The correct answer is option D.
173. High temperature carbonisation of coal takes place at __________ °C.
2000
700
1100
< 500
✅ The correct answer is option C.
174. Enamels
Give good glossy finish
Are same as varnish
Are prepared from non-drying oil
Do not contain pigment
✅ The correct answer is option A.
175. __________ acid is the main constituent of cotton seed oil.
Acetic
Linoleic
Palmitic
Oleic
✅ The correct answer is option B.
176. Ethyl alcohol cannot be produced
From waste sulphite substrate of paper mills
By esterification and hydroloysis of ethylene
From molasses
None of these
✅ The correct answer is option D.
177. Pick out the true statement pertaining to water treatment.
Slow sand filters can remove colour completely
Activated carbon can be used for taste & odour control without subsequent filtration
Application of activated carbon reduces the temporary hardness of water
Normally, the turbidity is removed by adding a coagulent prior to sedimentation
✅ The correct answer is option D.
178. __________ nature of hypo (sodium thiosulphate) makes it useful in photography.
Oxidising
Reducing
Complex forming
Photochemical
✅ The correct answer is option C.
179. Low temperature carbonisation of coal takes place at __________ °C.
300
1100
700
900
✅ The correct answer is option C.
180. The most reactive allotropic form of phosphorus is __________ phosphorus.
Red
Yellow
Violet
Black
✅ The correct answer is option B.