Section 175 of companies act

sec 175 provides

Unless the articles of the company otherwise provide, the members personally present at the meeting shall elect one of themselves to be the chairman thereof on a show of hands.

so, a member personally present may elected as chairman not a proxy and also proxy may be a member or not as per sec 176.

Also Regulation 50 to 52 Table A provide that:

The chairman, if any, of the Board shall preside as chairman at every general meeting of the company.
 - If there is no such chairman, or if he is not present within fifteen minutes after the time appointed for holding the meeting, or is unwilling to act as chairman of the meeting, the directors present shall elect one of their number to be chairman of the meeting.
- If at any meeting no director is willing to act as chairman or if no director is present within fifteen minutes after the time appointed for holding the meeting, the members present shall choose one of their number to be chairman of the meeting.

finally, proxy may not become a chairman of a general meeting.