Which one of the following is a non-metallic mineral?
A. Silver
B. Sulphur
C. Platinum
D. Iron
Answer: Option B
A. Silver
B. Sulphur
C. Platinum
D. Iron
Answer: Option B
Red phosphorus is less reactive than yellow phosphorus because
A. it is red in colour
B. it is highly polymerised
C. it is insoluble in C2H5OH
D. it is hard
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