Question

solve 2 and 3 in three or four lines maximum

Answer 1

2 ans :  The friction between the two surfaces can be increased if the two surfaces are pressed harder. Frictionis a form of force, which opposes the relative motion between the two surfaces in contact and it acts on both the surfaces.

3ans : (i) Production of hydrogen by electrolysis of water. ... (iv) Non-metals like hydrogen, fluorine, chlorine are obtained by electrolysis. (v) In this method pure metal is deposited at cathode from a solution containing the metal ions etc.

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