In the following questions more than one option of column I and II may be correlated.

1. Match the elements given in Column I with the properties mentioned in Column II.

Column I	Column II
(i) Li	(a) Insoluble sulphate
(ii) Na	(b) Strongest monoclinic base
(iii) Ca	(c) Most negative Eo value among alkali metals
(iv) Ba	(d) Insoluble oxalate
	(e) 6s2 outer electronic configuration

<p><span data-sheets-root="1">This is a matching type question as classified in NCERT Exemplar</span></p><p> (i) → (c); (ii) → (b); (iii) → (d) : (iv) → (a); (e)</p><p><strong> (i) </strong>Lithium has the highest negative reduction potential value. Due to the small size of lithium it has a small atomic size, the highest ionization enthalpy Due to this, the reducing power of lithium is the highest.</p><p><strong> (ii)</strong> Sodium is a stronger monoacidic base due to lower first ionization enthalpy of sodium. Also sodium forms sodium hydroxide&nbsp; Therefore 1 mole of it replaces one mole of hydrogen ions from acids.</p><p><strong> (iii) </strong>Calcium oxalate is an ionic compound because its hydration enthalpy is low. It is highly insoluble and dissolves poorly in water.</p><p><strong> (iv)</strong> Barium sulfate is insoluble due to the high hydration energy. The electronic configuration of barium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰5s²5p⁶ 6s²</p><p>Thus, option (iv) from column I is matched with (a) and (e) from column II.</p>

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