JEE Main 2014ChemistrySolutionsMediumMCQ

JEE Main 2014 — Solutions Question with Solution

JEE Main 2014 (19 Apr Online)

Question

The observed osmotic pressure for a 0.10 M solution of Fe(NH4)2(SO4)2 at 25°C is 10.8 atm. The expected and experimental (observed) values of Van't Hoff factor 'i' will be respectively;  (R = 0.082 L atm k- mol-1)

Choose an option

Show full solutionCorrect option: C
Correct answer
C5 and 4.42

Step-by-step explanation

π = i C R T.

1 0 . 8 = i × 0 . 1 0 × 0 . 0 8 2 × 2 9 8

i = 1 0 . 8 0 . 1 0 × 0 . 0 8 2 × 2 9 8 = 1 0 . 8 2 . 4 4 3 6   = 1 0 . 8 2 . 4 4 3 8

= 4.42 (experimental value)

FeSO 4 . NH 4 2 0 · 1 M SO 4 ⟶ Fe aq 2 + 0 1 M + 2 SO 4 aq 2 - 0 · 2 M + 2 NH 4 aq + 0 · 2 M

i (expected) = 0 · 5 M 0 · 1 M = 5

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Solutions chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2014, covering the Solutions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.