TS EAMCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

The first ionisation energies (in ${kJmol}^{- 1}$ ) of four consecutive elements of the second period are given in the options. The first ionisation energy of nitrogen is

A $1086$
B $1402$
C $1681$
D $1314$

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Answer & Solution

Correct Answer

(B) $1402$

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Detailed explanation

Ionisation energy is the energy which is required to remove the last electron from the outermost shell. Nitrogen has the atomic number of seven. It has the electronic configuration of 1s22s22p3. It has the high ionization energy more than the carbon and oxygen because it has the…

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.

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The first ionisation energies (in kJmol-1) of four consecutive elements of the second period are given in the options. The first ionisation energy of nitrogen is

Step-by-step Solution

The first ionisation energies (in ${kJmol}^{- 1}$ ) of four consecutive elements of the second period are given in the options. The first ionisation energy of nitrogen is