B.Sc

The career opportunities for students who have completed their post graduation in physics are very high. As a matter of fact, it is possible for them to get jobs in the private and public sectors. With a Masters degree in physics, candidates can get jobs with research institutions as technicians or as instructors. It is also possible for them to get employed with the defense sector. Those who have a doctorate can get jobs with automobile and other related industries.

For better career opportunities, B.Tech will be a good option as compared to B.Sc.

No government jobs are available after B.Sc biotech for sure, even after M.sc also no grantees as you will be provided with one fellowship programme under the Dept. of Biotech, India. They will be providing you different training programmes in private companies, if got selected through those companies, that would be fine. If not, again you have to carry your resume to all companies. But one should apply for the Dept. of biotech, India in the beginning of the 3rd starting itself. No guarantee that you would be able to get the opportunity in that fellowship.

Based on you subjects on 10+2, you are eligible to seek admission in B.Sc (Hons.) chemistry. You are advised to look at your targeted university last year's cut-off to check whether you will get admission or not.

Naseer, some universities like Lovely Professional University don't have this criteria. Their eligibility criteria just asks for a candidate to be pass in graduation with 50%.
There must be some other universities following the same criteria. You need to check.
If we talk about of LPU, it is doing really good on the placement front along with academics. So, you can think about taking admission there.
Best of Luck.