Ammonia

Step 1: Concept
Reaction: .
Step 2: Analysis
of at STP weighs 22 g.
Step 3: Conclusion
needs KOH, so needs KOH.
Final Answer: (B)

Step 1: Formula
Radioactive decay law: .
Step 2: Substitution
Mean life . At , .
Step 3: Ratio
The ratio of initial atoms to atoms present is .
Final Answer: (c)

Step 1: Chemical Nature
Ammonia ( ) is a basic gas.
Step 2: Analysis of Agents
- reacts with to form an addition compound ( ).
- (acidic) reacts with (basic).
- Quick lime (CaO) is basic and does not react with .
Step 3: Conclusion
Quick lime is the suitable drying agent.
Final Answer: (D)