Answers

2015-04-05T17:23:03+05:30
⇒82°30'E has been selected as the Standard Meridian of india because 82 degree 30' east is located at the middle of india ( east to west ). It was selected as the Standard Meridian in order to avoid confusion based on uniform time.
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2015-04-05T18:34:25+05:30
Because it is center most longitude that passes from Indian mainland  
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Nxt time if u r posting as 2nd answerer try to give extra points than 1st answer, if at all then,ur answer will b deleted bcoz of posting same answer;)
okay