Give reasons.
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

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

Why does a charged glass rod attract a piece of paper ?

Rohan observed that if a small piece of sodium is added to water it catches fire whereas a piece of calcium added to the water it does not catch fire. Can you explain his observations with the help of the chemical equations?

Clarke constructs a device by passing current through a piece of long insulated wire wrapped around an iron core. He uses this device for picking paper clips. What is the name of the device constructed by Clarke?

Which one of the following cations will give a green coloured ash when a piece of filter paper dipped in a solution containing its salt and Co(NO_(3))_(2) is burned?

Give reasons: A mixture of dilute NaOH and aluminium pieces is used to open drain.