Which of the following gases makes up 78% of our atmosphere and also a part of many element essential to life?
A. Carbon
B. Helium
C. Nitrogen
D. Oxygen
Answer: Option C
A. Carbon
B. Helium
C. Nitrogen
D. Oxygen
Answer: Option C
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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