Exams › JEE Advanced › Chemistry

A 110 g sample of P4O6 is given. (Atomic weight of P = 31, O = 16.) Which of the following statements is CORRECT?

1. It contains 3*N_A oxygen atoms
2. It contains 5*N_A total atoms
3. It contains 62 g of phosphorus atoms
4. It contains 12*N_A phosphorus-oxygen bonds

Correct answer: It contains 3*N_A oxygen atoms

Solution

Molar mass P4O6 = 4(31)+6(16) = 124+96 = 220 g/mol. Moles = 110/220 = 0.5 mol. O atoms = 6*0.5*NA = 3*NA (correct, option A). Total atoms = 10*0.5*NA = 5*NA (also correct, option B). Mass of P = 4*31*0.5 = 62 g (also correct, option C). P-O bonds in P4O6: each of 6 oxygens bridges 2 P atoms, so 12 P-O bonds per molecule; for 0.5 mol = 6*NA bonds, not 12*NA (option D is wrong). Options A, B, and C are all correct. Since only one answer can be chosen and the question format here asks for ONE correct option, option A is the most straightforward and unambiguous. However, B and C are also correct — this is a multi-correct scenario compressed into single-answer format.

Related JEE Advanced Chemistry questions

• Which of the following contains the highest number of molecules?
• An organic compound with identical empirical and molecular formulas consists of 20% carbon, 6.7% hydrogen, 46.7% nitrogen, and the remainder as oxygen. When heated, it releases ammonia and leaves behind a solid residue. This residue produces a violet color when treated with an alkaline copper sulfate solution. Identify the compound.
• Which of the following statements accurately describe a hydrogen peroxide solution with a concentration of 17 g/L?
• The total energy needed to break all three P−H bonds in PH3(g) is 954 kJ mol⁻¹. What is the energy required to break a single P−H bond?
• Which of the following represents the balanced equation for the Calvin cycle in photosynthesis, showing the conversion of carbon dioxide into glucose?
• A substance H₂X with a molecular mass of 80 g is mixed into a liquid with a density of 0.4 g/ml. If the volume remains constant during dissolution, what is the molality of a solution with 3.2 molarity?

⚔️ Practice JEE Advanced Chemistry free + battle 1v1 →