Ionic decomposition and conductivity of nitrogen-hydrogen compound

Steps:

• Empirical formula NH requires 1:1 N:H ratio overall in L.
• Gentle heating decomposes L to NH₃ (ammonia) and M, implying NH₄ groups release NH₃.
• Aqueous conductivity indicates L dissociates into ions in water.
• Options must match L's composition with NH₄⁺ cation and suitable anion for decomposition and empirical fit.

Why D is correct:

• NH₄⁺ and N³⁻ ions form an ionic salt like (NH₄)₃N, which dissociates for conductivity and decomposes to NH₃ and N₂ (M), aligning with empirical NH via simplified NH₄N representation.

Why the others are wrong:

• A: N⁻H₄ invalid ion; H⁻ not produced with NH₃.
• B: N⁻H₃ not standard; doesn't fit 1:1 empirical or decomposition.
• C: NH₄ invalid as compound; NH₃ as M contradicts production of ammonia.

Final answer: D