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

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

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Fuels and Combustion
Cannel coal

Is non-coking
Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
Has a high volatile matter content and burns with a luminous smoky flame
All of these

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