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$S_{1}$ : Alkali metals are not generally extracted electrolysis of their aqueous solutions
$S_{2}$ : The electro positivity of alkali metals decreases with increase in atomic number
$S_{3}$ : Lithium is hardest metal in alkali metals
$S_{4}$ : Potassium carbonate cannot be prepared by solvay’s process

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T F T F

T F T T

T T T T

F T F T

answer is B.

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Detailed Solution

The electro positivity of Alkali metals increases with increase in Atomic number

$L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}$

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