A. Insecticides (e.g. moth balls)
B. Unsaturated polyesters
C. Drug intermediates e.g. β-naphthol
D. All A., B. and C.
Related Mcqs:
- Naphthalene is removed from coke oven gas by________________?
A. Scrubbing with wash oil (a petroleum product)
B. Adsorbing on bog iron bed
C. Absorbing in vetro-coke solution
D. None of these - Naphthalene recovered from coke oven gas is used___________________?
A. As moisture proof coating on fibres
B. As moth balls (insecticides)
C. As a fuel in furnaces
D. For making electrodes - Coal is pulverised before burning in large capacity boiler furnaces mainly to____________________
A. Ensure its complete combustion
B. Facilitate easy ash removal
C. Enhance its calorific value
D. Provide trouble free operation - The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to___________________?
A. Minimise its corrosion
B. Avoid radiation heat loss
C. Make it look attractive
D. None of these - Weathering of coal during storage causes_______________?
A. Reduction in coal size
B. Increase in its friability
C. Decrease in its caking capacity
D. All A., B. and C. - Softening temperature of coal ash is a measure of the _____________ of coal?
A. Caking tendency
B. Coking tendency
C. Clinkering tendency
D. Size stability - Which of the following has the highest gross calorific value ?
A. Blast furnace gas
B. Coke oven gas
C. Carburetted water gas
D. Oil refinery gas - A coal with high ash content is undesirable, as________________?
A. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber
B. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace
and causes its spalling due to different co-efficient of expansion/contraction of the refractory
and the ash
C. The ash retains the sulphur & phosphorus and thus affects the quality of products in
metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to
the boiler tubes thereby reducing the heat transfer
D. All A., B. and C. - ‘Mixed gas’ used in steel plants is a mixture of___________________?
A. B.F. gas and coke oven gas
B. Coke oven gas and converter gas
C. Coke oven gas and L.P.G
D. Blast furnace gas and naphtha vapor - Spontaneous combustion of coal on storage results due to___________________?
A. Inadequate ventilation
B. Low temperature oxidation
C. Storage in large heaps with small surface to volume ratio
D. All A., B. and C.
