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

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

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Basic General Knowledge
The official languages of the United Nations are

Arabic, Japanese, Chinese, English, French and German
African, Chinese, English, French, German and Spanish
Arabic, Chinese, English, French, Russian and Spanish
Chinese, English, French, Hindi, Japanese and Spanish

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