I just reset my password and was asked payment info again and was charged without any purchase, why is it so.

I forgot applied password and successfully rest that and when tried to update  few free apps it redirected to updated payment info and I did that and was charged for free updates any idea about this kind of issues.

You are not charged for free updates.
Each time that you add or change your card's details on your account a small temporary store holding charge may be applied to check that the card details are correct and valid and that it's registered to exactly the same name and address as on your iTunes account - it should disappear off your account within a few days or so.
Store holding charge : http://support.apple.com/kb/HT3702

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