Which group contains elements that are colourless, tasteless and odorless gases?
A. Alkali metal group
B. Zero group
C. Halogen group
D. Alkaline-earth metal group
Answer: Option B
A. Alkali metal group
B. Zero group
C. Halogen group
D. Alkaline-earth metal group
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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