1. Which acid is present in lemon ?
A.marlic acid
B.citric acid
C.lactic acid
D.tartaric acid
Answer: B
Explanation:citric acid is present in lemon.
A.nitric acid
B.sulphuric acid
C.hydrochloric acid
D.phosphoric acid
Answer:- B
3. Which metal is heaviest ?
A.osmiumB.mercury
C.iron
D.nickle
Answer:-A
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