A. Are absorbed throughout the plant
B. Kill insects following external bodily contact
C. Are stomach poisons
D. Emit poisonous vapour
Related Mcqs:
- The terminology ‘BTX’ used in coal tar distillation industry refers to___________________?
A. Benzol-toluol-xylol
B. Benzol-toluene-xylene
C. Benzene-toluol-xylol
D. Benzene-toluene-xylene - Function of thinner in a paint is to ______________________ ?
A. Accelerate the oxidation of oil
B. Prevent gelling of the paint
C. Suspend pigments & dissolve film forming materials
D. Form a protective film - Hydrogenation of oil does not ___________________?
A. Remove double bonds
B. Raise its melting point
C. Improve its resistance to oxidation
D. None of these - Pick out the false statement pertaining to water treatment ?
A. Aeration of water is effective in CO2 removal
B. The zeolite water softening process reduces the hardness of water by not more than 50%
C. Sodium sulphate or sodium carbonate do not cause hardness in water
D. Water with pH value less than 7, is acidic - Esterification reaction___________________?
A. Produces soap
B. Is reversible
C. Is a reaction between an alcohol and an organic acid
D. All A, B. and C. - Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of_________________?
A. Carbon
B. Arsenic
C. Lead
D. Sulphur - Hydrogenation of edible vegetable oils_________________?
A. Is an exothermic reaction
B. Increases their melting point
C. Is done in presence of nickel catalyst
D. All A , B. and C. - Black liquor is converted into white liquor by __________________________?
A. Evaporation and burning the concentrate followed by causticisation of products
B. Multi-effect evaporation only
C. Selective liquid extraction
D. Extractive distillation - Pick out the wrong statement?
A. Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98%
B. The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with
sulphur trioxide
C. Vitriol oil is nothing but technical sulphuric acid
D. Decomposition of sulphuric acid on heating does not start before its boiling - Fermentation of molasses to produce ethyl alcohol is done at ________________ °C?
A. 20 – 30
B. < – 5
C. 100 – 150
D. 250 – 300
