Basic General Knowledge
Nowadays many novel chemicals are being synthesized termed as xenobiotics. The unique feature of these is what they are I.biodegradable II.non- biodegradable III.pose on environmental threat IV.they are environment friendly

II, III
I, III
I, III, IV
II, III, IV

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Basic General Knowledge
Missile 'prithivi' aims

to hit target without the help of the Air Forces
to defend a large installations like oil-fields etc. against enemy attacks
to test the performance of an indigenously built heat-shield
None of these

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