Pure nitrogen is obtained by the decomposition of nitride M_x(N_3)_y. What is the value of (x+y)?

JEE Main Chemistry question

Pure nitrogen is obtained by the decomposition of nitride (N). What is the value of ?

Answer: 2

Pure N (uncontaminated by any other gas) is obtained from the thermal decomposition of sodium azide, NaN (used in automobile airbags):

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Question ID VK-130698