Observe the diagram below and answer the questions that follow:
1. Which process is shown in the above diagram?
2. How can we liquefy air? Give any two methods.
3. Which gas separates out in solid form?
4. Which gas separates out first in the fractional distillation?
5. Which gas is separated at last?
6. What are the roles of caustic soda and concentrated sulphuric acid?
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