1) She has asked for half of my salary as interim maintenance, in this case am i liable to give her maintenance? We dont have any child, also she is qualified for working. Before marriage she was working and even after leaving me she worked for some time, however as of now she is not working.
She may claim half or even your full salary, but there is a norm set out for granting interim maintenance. If she is qualified, employed earlier and now sitting idle at home, you can very well plead your objection to repudiate her claim on this ground. There are various settled laws to your support in this regard.
2)The expenses on marriage have been shown 10 times more than what was done and have asked me to pay all the expenses. How can i counter these claims besides asking for receipts.
She may claim anything but the marriage expenses are not reimbursable. She cannot claim the marriage expenses even if it is actual expense, because it is not an agreement to return the expenses if the marital ties are being snapped. Moreover she is still your legally wedded wife.
3) We both were married in mumbai and stayed there. Even after separating she stayed in mumbai. However the DV case has been filled in her hometown, making me travel every month and to look of a new lawyer. Can i shift the case to mumbai, since we got married here.
You can apply for a transfer of this case mentioning your hardships and her intentions to torture you.
4) Her age mentioned in petition is incorrect, for which I have documentary proof. Can file 191 perjury case on her.
No, not maintainable for this reason.
5) Our address mentioned in application does not exist. It was by change that our watchman helped postman to deliver the notice to us. I suspect the non existing address was written so that we don't receive any notice and they get ex-part. How can i mention this in court and how can it help my case.
You cannot take defence on this ground because that was the last known address to her.