KCET · Chemistry · Thermodynamics (C)
The correct order in which the first ionisation potential increases is
- A \(\mathrm{Na}, \mathrm{K}, \mathrm{Be}\)
- B \(\mathrm{K}, \mathrm{Na}, \mathrm{Be}\)
- C \(\mathrm{K}, \mathrm{Be}, \mathrm{Na}\)
- D \(\mathrm{Be}, \mathrm{Na}, \mathrm{K}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{K}, \mathrm{Na}, \mathrm{Be}\)
Step-by-step Solution
Detailed explanation
The first ionisation potential generally increases in a period from left to right and decreases in a group from up to down. Thus, the correct order of first ionisation potential is
\[
\mathrm{K} < \mathrm{Na} < \mathrm{Be}
\]
\[
\mathrm{K} < \mathrm{Na} < \mathrm{Be}
\]
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