Millionaire Mode

Composition of air - class-VII

Question 1 of 63

Dinitrogen and dioxygen are main constituents of air, but these do not react with each other to form oxides of nitrogen because:

  1. the reaction is endothermic and requires very high temperature
  2. the reaction can be initiated only in presence of a catalyst
  3. oxides of nitrogen are unstable
  4. $N _{2}$ and $O _{2}$ are unreactive

Prize Money

15₹7 Crores
14₹1 Crore
13₹50,00,000
12₹25,00,000
11₹12,50,000
10₹6,40,000
9₹3,20,000
8₹1,60,000
7₹80,000
6₹40,000
5₹20,000
4₹10,000
3₹5,000
2₹2,000
1₹1,000