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Li, Na, K
N, P Au
Cl, Br, I
Ca, Sr, Ba
Which of the following has the longest wave length?
Which of the following has the lowest melting point?
Which of the following in automobile exhaust can cause cancer?
Which of the following is a characteristic of all minerals?
Which of the following is a compound?
Which of the following is a man-made source of air pollution ?
Which of the following is a monoatomic gas?
Which of the following is a natural polymer?
Which of the following is a non metal that remains liquid at room temperature ?
Which of the following is a radioactive element?