Q.

Statement 1 : Ionisation potential across the period is Na < Al < Mg < Si.Statement 2 : Ionisation potential decreases with decrease in atomic size.

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a

Both Statement 1 and Statement 2 are true.

b

Statement 1 is true and Statement 2 is false.

c

Statement 1 is false and Statement 2 is true.

d

Both Statement 1 and  Statement 2 are false.

answer is B.

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Detailed Solution

Statement 1 is true but statement 2 is false.Ionization potential decreases with increase in atomic size and also for a given  shell. I.E. is in given order.s > p > d > f
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Statement 1 : Ionisation potential across the period is Na < Al < Mg < Si.Statement 2 : Ionisation potential decreases with decrease in atomic size.