NEET · Chemistry · STD 12 -1. Solution and colligative properties

The freezing point depression constant \(\left( K _{ f }\right)\) of benzene is \(5.12\, K\, kg\, mol ^{-1}\). The freezing point depression for the solution of molality \(0.078\, m\) containing a non-electrolyte solute in benzene is..........\(\,K\) (rounded off upto two decimal places)

A \(0.60\)
B \(0.20\)
C \(0.80\)
D \(0.40\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(0.40\)

Step-by-step Solution

Detailed explanation

\(\Delta T _{ f }= K _{ f } \times m\) \(=5.12 \times 0.078\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

The \(IUPAC\) name of an element with atomic number \(119\) is \(.........\)

NEET 2022 Easy

Match List-I with List-II

\(\text{List - I}\)	\(\text{List - II}\)
\(\text{A. Haber process}\)	\(\text{I. Fe catalyst}\)
\(\text{B. Wacker oxidation}\)	\(\text{II. \(\text{PdCl} _2\)}\)
\(\text{C. Wilkinson catalyst}\)	\(\text{III.}\) \(\left[\left(\text{PPh} _3\right)_3\text{RhCl} \right]\)
\(\text{D. Ziegler catalyst}\)	\(\text{IV.}\) \(\text{TiCl} _4\) with \(\text{Al} \left(\text{CH} _3\right)_3\)

Choose the correct answer from the options given below :

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