Can i use dual supply op amp in single supply mode? Is it okay to convert a bipolar voltage to uni polar and then feed it to a single supply op amp(amplifier)?
Can i use dual supply op amp in single supply mode?
From the perspective of an op-amp, it sees two power rails, one more positive than the other and that's all it cares about. If you happen to have +/-15V rails, you are doing so because it is important that your signal is referenced to an extended ground that connects to other "systems".
If you have an arbitrary ground and +/-15V rails then you might as well have 0V and +30V as your rails with the nominal signal reference point at +15V.
Bottom line - with probably higher than 99% probability, there isn't an op-amp that is specifically "dual rail" or "single rail". From my experience I cannot ever remember seeing one and I've had a lot of experience!
You have asked two complementary questions.
Did you mean to?
Yes, but ... .
As long as you do not violate any of the specifications it will work.
In many cases that puts excessive constraints on your design.
Most dual supply opamps have an input voltage range that does not include either supply rail. And Vout often does not swing all the way to positive or negative supply.
Some opamps are sold as RIRO where
RI = Rail IN and
RO = Rail
RI means the input voltage can swing all the way to both rails during operation.
And RO means that the output can swing all the way to both rails during operation.
However even an RO opamp may not swing QUITE all the way to the rails. Sometimes the few mV matters.
A very few oamps have internal power supplies which supply voltages outside the rails so the input and output can swing TO the rails.