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From the given statements
i) O -----H hydrogen bond length is more than covalent "O–H" bond length.
ii) The ionic bond strength of CsF is more than that of NaF.
iii) The number of electrons present in all inner shells of sodium atom are 10.
The correct combination is

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only i is correct

only i and ii are correct

only ii and iii are correct

only i and iii are correct

answer is D.

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Detailed Solution

i) B.L: Hyderogen bond B.L > Normal covalent bond B.L ⇒ correct

O-------H > "O-H"

ii)

$\frac{L . E decreases}{NaF > CsF}$

Bond strength decreases

lattice energy $\propto$ Bond strength

iii)

$11^{Na} \underset{⏟}{1 s^{2} 2 s^{2} p^{6}} 3 s^{1} \Rightarrow CORRECT$

↓

Innershells contains 10 electrons

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