Practice question

Given: Which of the following elements forms a compound with hydrogen of the type XH_3? These values define the system as per NCERT data. Formula: Group 15 elements (ns²np³) like nitrogen form NH_3, using 3 valence electrons to bond with H.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.