Neha Sharma and Akanksha Dudpuri Solutions for Chapter: Combustion and Flame, Exercise 5: Some Questions from NCERT

List the conditions under which combustion can take place.

Give reasons for the following statement:

Water is not used to control fires involving electrical equipment.

Give a reason for the following:
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Name the unit in which the calorific value of a fuel is expressed.

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

Which zone of a flame does a goldsmith use for melting gold and silver? Give reason.

If $4.5 \mathrm{kg}$ of fuel is completely burnt and the amount of heat produced stands measured at $1,80,000 \mathrm{kJ}$. what is the calorific value?

Can the process of rusting be called combustion? Explain.