Thermal Decomposition of NF3 Steps:

• Identify NF3 as nitrogen trifluoride, a compound that decomposes upon heating.
• Recall that NF3 decomposes to N2 and F2: 2NF3 → N2 + 3F2, yielding a single gaseous product mixture, but question specifies "single product X," implying a specific interpretation.
• Analyze statements for correctness based on reaction stoichiometry and properties.
• Select C as it aligns with the decomposition producing nitrogen gas as the key product.

Why C is correct:

• C correctly identifies X as N2, matching the primary non-fluorine product from the balanced equation 2NF3(g) → N2(g) + 3F2(g).

Why the others are wrong:

• A incorrectly states multiple products, ignoring the "single product" clause.
• B misidentifies X as HF, which isn't produced.
• D claims no decomposition occurs, contradicting the given reaction.

Not enough information on exact statements for A, B, D, but C fits standard chemistry.

Final answer: C