16. The acid injected by a bee when it stings that cause pain and irritation-
A. Acetic Acid
B. Methanoic Acid
C. Citric Acid
D. Sulphuric Acid
17. Which one of the following is the heaviest metal?
A. Silver
B. Copper
C. Gold
D. Lead
18. Which of the following metal is found to be as a liquid at an ordinary temperature –
A. Tin
B. Nickel
C. Mercury
D. Lead
19. The gas originating in the paddy field is –
A. Ethane
B. Methane
C. Nitrogen
D. All of these
20. The heavy water is a type of –
A. Moderator
B. Coolant
C. Ore
D. Fuel