Answer:
Repulsion is the surest test of electrification. So balls 2, 3, 4 and 5 are electrically charged. Pairs (2, 3) and (4, 5) are similarly charged. As pair (2, 4) shows attraction, so balls 2 and 4 are oppositely charged. If balls (2, 3) are positively charged, then (4, 5) be negatively charged or vice versa. The ball 1 is attracted both by 2 and 4 separately i.e., by both kinds of charges. Hence the ball 1 is neutral.
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