Related Questions

Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.
A 50-80
B 250-400
C 1000-1200
D 800-900
The most stable allotropic form of phosphorous is the __________ phosphorous.
A White
B Black
C Yellow
D Red
Red phosphorous is changed into white phosphorous by
A Heating in presence of light
B Melting under pressure
C Vaporisation followed by condensation
D None of these
Both white phosphorous as well as red phosphorous
A Are soluble in CS2
B Burns when heated in air
C Reacts with hot caustic soda solution to give phosphine
D All of the above
In a group of 60 people, 27 like coke and 42 like borhani and each person likes at least one of the two drinks How many people like both coke and borhani?
A 9
B 129
C 69
D 15
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.
A Colour
B Moisture content
C Ash content
D Volatile matter
Coke made in narrower by-product coke ovens (as compared to wider ovens) is
A Less reactive
B Stronger
C Smaller in size
D All of the above
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
A Density
B Porosity
C Electrical resistivity
D None of these
Width of the coke oven towards coke side is slightly more than that on pusher side to
A Facilitate easy discharging of coke as it swells during carbonisation
B Facilitate uniform heating of the oven
C Increase the output of the coke
D None of these
Narrow coke ovens as compared to wider coke ovens
A Produce smaller coke
B Produce stronger coke
C Require less time of carbonisation
D All of the above

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