railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Chemistry Basic Concepts of Chemistry

નીચેનામાંથી કયો પદાર્થ તમાકુમાં હાજર છે?

1
કેફીન
2
હશીશ
3
નિકોટીન
4
મોર્ફીન
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