NEETChemistryp Block Elements (Group 15, 16, 17 & 18)
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Very pure nitrogen gas can be obtained by heating barium azide. Reason (R): The thermal decomposition of barium azide yields nitrogen gas and solid barium, leaving no other gaseous byproducts to contaminate the nitrogen. In the light of the above statements, choose the most appropriate answer from
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Assertion (A) is correct. Very pure nitrogen can be obtained by the thermal decomposition of sodium or barium azide. Reason (R) is also correct and explains (A). The reaction is: Ba(N₃)₂ Ba(s) + 3N₂(g) Because barium is a solid metal, nitrogen is the only gaseous product formed. This absence of other gaseous byproducts is the reason why the nitrogen obtained is of very high purity. Answer: Both (A) and (R) are correct and (R) is the correct explanation of (A)