Answers are as follows:
1. OR- 11101111
2. NOT- (A- 00110101) & (B- 01101101)
Due to the fact that, the NOT gate accepts a single variable at a time.
3. XNOR- 10001000
4. AND- 10010010
5. XOR- 00011000
Those are my answers. Hope I'm on right and I look forward to more questions.