Elements of atomic numbers of 35, 53 and 85 are . . . . . . . .
A. halogen
B. alkaline
C. inert gases
D. halides
Answer: Option A
A. halogen
B. alkaline
C. inert gases
D. halides
Answer: Option A
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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