Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE MainChemistryp Block Elements (Group 15, 16, 17 & 18)

Consider the hydrides of Group 15 elements, EH ₃ ( E = N , P , As , Sb , Bi ). The variation of three different properties (X, Y, and Z) of these hydrides is plotted against the atomic number of the central atom E . The observed trends are as follows: Curve X: Decreases continuously from NH ₃ to BiH ₃ . Curve Y: Is anomalously high for NH ₃ , drops sharply for PH ₃ , and then increases continuously up to BiH ₃ . Curv

Options

  1. AX = Reducing character, Y = Boiling point, Z = Thermal stability
  2. BX = Thermal stability, Y = Lewis basicity, Z = Reducing character
  3. CX = Lewis basicity, Y = Boiling point, Z = Reducing character
  4. DX = Boiling point, Y = Reducing character, Z = Thermal stability

Correct answer

C. X = Lewis basicity, Y = Boiling point, Z = Reducing character

Step-by-step solution

For Group 15 hydrides ( EH ₃ ): Curve X represents a property that decreases continuously down the group. Lewis basicity decreases from NH ₃ to BiH ₃ because the electron density on the central atom decreases as its size increases. Thermal stability and bond angle also follow this trend. Curve Y represents a property that is anomalously high for NH ₃ , lowest for PH ₃ , and then increases. This corresponds to the boiling point. The boiling point of NH ₃ is unusually high due to strong intermolecular hydrogen bondin

Practice p Block Elements (Group 15, 16, 17 & 18) on Quantrex Academy →

More from p Block Elements (Group 15, 16, 17 & 18)

Correct statement(s) about the compounds X , Y and Z is(are) 2026Correct statement(s) about the compounds P , Q and R is(are) 2026Find the correct statements related to group 15 hydrides. A. Reducing nature increases from NH₃ to BiH₃ B. Tendency to donate lone pair of electrons decreases from NH₃ to BiH₃ C. T 2026Treatment of a gas ' X ' with a freshly prepared ferrous sulphate solution gives a compound ' Y ' as a brown ring. The compounds X and Y are. 2026Correct statements from the following are: A. Nitrogen in oxidation states from +1 to +4 disproportionates in acid medium. B. Nitrogen has the ability to form d - p multiple bonds 2026Given below are two statements: Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in SO₂ is -2 and in OF₂ it is +2 . 2026Given below are two statements : Statement (I) : Oxidising power of halogens decreases in the order F₂ > Cl₂ > Br₂ > I₂ , which is the basis of "Layer test". Statement (II) : "Laye 2026Given below are two statements : Statement I : The increasing order of boiling point of hydrogen halides is HCl Statement II : The increasing order of melting point of hydrogen hal 2026 Full p Block Elements (Group 15, 16, 17 & 18) list All JEE Main PYQs