NEET 2019 Odisha · ChemistryPrevious Year Question

Which of the following oxoacids of phosphorus has the strongest reducing property?

Answer: (C) (c) $H X_{3} PO X_{2}$ . \textbf{Answer:} (c) $H X_{3} PO X_{2}$ .

A.(a) $H X_{4} P X_{2} O X_{7}$
B.(b) $H X_{3} PO X_{3}$
C.(c) $H X_{3} PO X_{2}$ ✓
D.(d) $H X_{3} PO X_{4}$

Correct Answer

Solution & Explanation

\textbf{Answer:} (c) $H X_{3} PO X_{2}$ . \textbf{Solution:} The reducing property of phosphorus oxoacids is proportional to the number of $P - H$ bonds. $H X_{3} PO X_{2}$ (hypophosphorous acid) contains the maximum number of $P - H$ bonds (two), so it is the strongest reducing agent. For comparison: $H X_{3} PO X_{3}$ has one $P - H$ bond, while $H X_{3} PO X_{4}$ and $H X_{4} P X_{2} O X_{7}$ have none.

🎯

43,000+ questions in हिंदी & English · one-tap toggle

Practice NEET 2019 Odisha Chemistry — free, with instant solutions

43,000+ NEET questions solved step-by-step, chapter-wise, in the MedicNEET app.

Open →📚Practice all NEET Chemistry PYQs chapter-wise →💡Don't get it? Learn the Redox Equilibrium concepts →

← Chemistry Q5 Chemistry Q7 →

More NEET PYQ solutions

ChemIdentify the suitable reagent for the following conversion: C6H5COOCH3 -> C6H5CHO (methyl benzoate to benzaldehyde)ChemThe correct order of decreasing acidity of the following aliphatic acids is ChemThe major product of the following reaction is: 4-oxo-4-phenylbutanenitrile C6H5-CO-CH2-CH2-CN is treated with (i) CH3MgBr (excess) and then (ii) H3O+.ChemOut of the following complex compounds, which compound will have the minimum conductance in solution?ChemWhich of the following are paramagnetic? A. [NiCl4]^2- B. Ni(CO)4 C. [Ni(CN)4]^2- D. [Ni(H2O)6]^2+ E. Ni(PPh3)4 ChemThe correct order of the wavelength of light absorbed by the following complexes is: A. [Co(NH3)6]^3+ B. [Co(CN)6]^3- C. [Cu(H2O)4]^2+ D. [Ti(H2O)6]^3+ChemThe correct order of decreasing basic strength of the given amines is: (N-ethylethanamine = (C2H5)2NH; ethanamine = C2H5NH2; N-methylaniline = C6H5NH(CH3); benzenamine/aniline = C6H5NH2)ChemPredict the major product P in the following sequence of reactions. The starting material is 1-methylcyclopent-1-ene: (i) HBr, benzoyl peroxide; (ii) KCN; (iii) Na(Hg)/C2H5OH P (major). The structures of the options (A)-(D) are shown in the image below:

More: All NEET 2019 Odisha Chemistry PYQs · NEET Chemistry PYQs · All NEET PYQs · Previous year papers