JEE Mains · Chemistry · STD 12 - 4. d and f- block elements

Given below are two statements Statement \(I\): Aqueous solution of \(K _2 Cr _2 O\), is preferred as a primary standard in volumetric analysis over \(Na _2 Cr _2 O\), aqueous solution Statement \(II:\) \(K _2 Cr _2 O\), has a higher solubility in water than \(Na _2 Cr _2 O _7\) In the light of the above statements, choose the correct answer from the options given below:

A Both Statement \(I\) and Statement \(II\) are true
B Both Statement \(I\) and Statement \(II\) are false
C Both Statement \(I\) is true but Statement \(II\) is false
D Both Statement \(I\) is false but Statement \(II\) is true

Verified Solution

Answer & Solution

Correct Answer

(C) Both Statement \(I\) is true but Statement \(II\) is false

Step-by-step Solution

Detailed explanation

(1) \(K _2 Cr _2 O\), is used as primary standard. The concentration \(Na _2 Cr _2 O _7\) changes in aq. solution. (2) It is less soluble than \(Na _2 Cr _2 O _7\).

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

Match List \(I\) with List \(II\)

List \(I\) Complex	List \(II\) \(CFSE(\Delta_0)\)
\(A\) \(\left[ Cu \left( NH _3\right)_6\right]^{2+}\)	\(I\) \(-0.6\)
\(B\) \(\left[\operatorname{Ti}\left( N _2 O \right)_6\right]^{3+}\)	\(II\) \(-2.0\)
\(C\) \(\left[ Fe ( CN )_6\right]^{3-}\)	\(III\) \(-1.2\)
\(D\) \(\left[ NiF _6\right]^{4-}\)	\(IV\) \(-0.4\)

Choose the correct answer from the options given below:

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Match List \(I\) with List \(II\) :

LIST \(I\) (Hybridization)	LIST \(II\) (Orientation in Space)
\((A)\) \(\mathrm{sp}^3\)	\((I)\) Trigonal bipyramidal
\((B)\) \(\mathrm{dsp}^2\)	\((II)\) Octahedral
\((C)\) \(\mathrm{sp}^3 \mathrm{~d}\)	\((III)\) Tetrahedral
\((D)\) \(s p^3 d^2\)	\((IV)\) Square planar

Choose the correct answer from the options given below :

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