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Electronic Circuit

I have a spst relay(operating voltage-12v) using for switching the solenoid valve(24VDC and 0.5Amp) which connected through 24 V battery. relay is again connected to the transistor BJT NPN . So please suggest me that which transistor is most suitable.

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Any NPN transistor that can handle the current that needs to flow though it.
No, you also need to check that MINIMUM Hfe is high enough that the required base currrent ( = load current/Hfe) isn't too large for the PIC to drive.
An optocoupler to a SCR or a Triack would be better.
Not on DC it wouldn't
Why not I do it on DC all the time.
How do you turn it off ?
I think I just replied to myself.

When there is no more power to the LED in the optocoupler.

See my Instructable Ghost Busted.

https://www.instructables.com/id/Ghost-Busted/
When there is no more power to the LED in the optocoupler.
2N3700 should do you nicely.

With it at o.5 amps it will be functioning at Q.

Joe