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Strontium and barium form ionic compounds because of their

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a

Low lattice energies

b

High lattice energies

c

High ionisation energies

d

Large atomic sizes

answer is C.

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Detailed Solution

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Be⁺² < Mg⁺²< Ca⁺² < Sr⁺² < Ba⁺² Size of ions

\large \xrightarrow{{BeC{l_2}\; < \;MgC{l_2}\; < \;CaC{l_2}\; < \;SrC{l_2}\; < \;BaC{l_2}}}\;percentage\;of\;ionic\;Character

As the size of cation increases polarizing power of cation decreases
Distortion of electron cloud in anion decreases hence sharing property of electron pair in M-Cl bond decreases means transfer of electron property increases
Therefore, Ionic nature of bond increases
So, Barium compounds are ionic in nature

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