Question

If an uncharged body is touched to a disc of charged electroscope, the leaves of an electroscope collapse.
Give reason​

Answer 1

So, before answering this question ask yourself - What do you think is holding the leaves apart?

It is a charge, equal across all the metal leaves which holds them apart. So, if you touch a 'charged' metal rod to it, you allow the charge to spread across the much larger metal rod, becoming essentially zero on the leaves. So the leaves ‘collapse’.

Answer 2

Answer:

Yes it aquire a positive charge when lose a. Electron

But while gaining it aquire negative

And metal and non metal can be classified on the basis of valency of 1234 as metal