✓ 3 MARKS
Numericals
🔥 APPEARED IN 3 BOARD SETS
A solution is prepared by dissolving $5\text{ g}$ of a non-volatile solute in $200\text{ g}$ of water. It has a vapour pressure of $31\cdot84\text{ mm Hg}$ at $300\text{ K}$. Calculate the molar mass of the solute.
(Vapour pressure of pure water at $300\text{ K} = 32\text{ mm Hg}$)
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2024 | Series 56-3 | Set 1 | Question 22 |
| CBSE 2024 | Series 56-3 | Set 2 | Question 28 |
| CBSE 2024 | Series 56-3 | Set 3 | Question 27 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)