Showing tax collected on house rent in itr 2

No need to show it in deductor's ITR, it is declared in form 26AS, if the amount already deposited.

For TDS deduction u/s. 194-I ......the tenant has to obtain TAN for TDS deduction, if he/she is liable to deduct TDS..... & submit the TDS deducted to treasury under his TAN & file respective returns.

For any TDS u/s. 194-IB (i.e, rent above 50,000/- PM)

The Tenant of the property (deductor of tax) has to furnish information regarding the transaction, online on the TIN website i.e. www.tin-nsdl.com. After successfully providing details of transaction, deductor/tenant can:

• Either make the payment online (through e-tax payment option) immediately; Or
• Make the payment subsequently through e-tax payment option (net-banking account) or by visiting any of the authorized Bank branches. However, such bank branches will make e-payment without digitization of any challan. The bank will get the challan details from the online form filled on TIN website(www.tin-nsdl.com)  

Deductor (tenant) is not required to declare it in his ITR........

Deductee (owner) will claim it by declaring it in TDS2 column, as per form 16C [Form 16C is the TDS certificate to be issued by the deductor (Tenant of property) to the deductee (Landlord of property) in respect of the tax deducted] or form 26AS.