Fuels and Combustion
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to

Make it look attractive
Avoid radiation heat loss
Minimise its corrosion
None of these

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Fuels and Combustion
Beehive coke oven

Gives larger yield of coke (around 85%) as compared to by-product ovens
Takes 2-3 days for coking of coal but requires no external fuel for heating
Produces coke with very poor strength
Facilitates by-products recovery

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