TS EAMCET · Chemistry · General Organic Chemistry

When sodium fusion extract of an organic compound is boiled with iron (II) sulphate solution followed by addition of concentrated \(\mathrm{H}_2 \mathrm{SO}_4\), gives Prussian blue colour. This confirms the presence of the element

A Sulphur
B Chlorine
C Phosphorus
D Nitrogen

Verified Solution

Answer & Solution

Correct Answer

(D) Nitrogen

Step-by-step Solution

Detailed explanation

NO SOLUTION

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

Observe the following data ( \(\Delta_i \mathrm{H}_1, \Delta_i \mathrm{H}_2\) and \(\Delta_{\text {eg }} \mathrm{H}\) represent the first, second ionisation enthalpies and electron gain enthalpy respectively).

Element	\(\begin{gathered}\Delta_i \mathrm{H}_1 \\ \left(\mathrm{~kJ}\mathrm{~mol}^{-1}\right)\end{gathered}\)	\(\begin{gathered}\Delta_i \mathrm{H}_2 \\ \left(\mathrm{~kJ}\mathrm{~mol}^{-1}\right)\end{gathered}\)	\(\begin{gathered}\Delta_{\text{eg}}\mathrm{H}\\ \left(\mathrm{kJ}\mathrm{mol}^{-1}\right)\end{gathered}\)
I	\(520\)	\(7300\)	\(-60\)
II	\(490\)	\(3051\)	\(-48\)
III	\(1681\)	\(3374\)	\(-328\)
IV	\(2372\)	\(5251\)	\(+48\)

Using the data identify the most reactive metal.

TS EAMCET 2025 Medium

The molality (in mol \(\mathrm{kg}^{-1}\) ) of 1 mole of solute in \(50 \mathrm{~g}\) of solvent is

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