Question

2. Hydrogen is present in the atmosphere. It is a highly inflammable gas. Still there is no fire occur in the atmosphere. The possible reason might be a. Oxygen is necessary of burning.
b. Hydrogen is lighter than oxygen
c. It is present in the upper layer of atmosphere
d. All a,b and c are correct

Answer 1

Answer:

d all r correct

Explanation:

hope this helps

Answer 2

Answer:

B

Explanation:

As (a)option is irrelavent  but needed for combustion and (c) is not appropriate *SO HENCE OPTION B*