What is dry ice?
A. Solid carbon dioxide
B. Crystalline NaCl
C. Ice frozen at -50°C
D. Solid H2O
Answer: Option A
A. Solid carbon dioxide
B. Crystalline NaCl
C. Ice frozen at -50°C
D. Solid H2O
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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