किन्हीं दो प्रश्नों का उत्तर दीजिए। सभी प्रश्नों के अंक समान हैं। Analyze emerging challenge and opportunities for India's foreign policy in 21" century. इक्कीसवी सदी में भारत की विदेश नीति के समक्ष उभरती चुनौतियों एवं अवसरों का विश्लेषण कीजिये। long answer
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A photoreactor is a chemical reactor device which brings photons, a photocatalyst, and reactants into contact, as well as collects the reaction products deriving from physicochemical transformations.
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