Mock Test 1 — s-Block Elements

Cesium is used in photoelectric cells because:

The strongest reducing agent in Group 1 in aqueous solution:

The hydride which is NOT ionic:

Sodium reacts with O₂ excess to give:

Hardest alkali metal:

Be does NOT show variable oxidation state, mostly:

Solvay process cannot be used to make:

The flame color of Ba:

$Mg(NO_3)_2$ on strong heating gives:

The carbide which gives methane on hydrolysis:

Number of alkali metals (excluding Fr):

Number of moles of H₂ liberated from $1$ mole of Na with water:

Number of OH groups in slaked lime Ca(OH)₂:

Assertion (A): Lithium is the strongest reducing agent in aqueous solution among alkali metals. Reason (R): Li⁺ has the highest hydration energy among alkali metal ions due to its small size.

Assertion (A): Beryllium chloride is covalent while CaCl₂ is ionic. Reason (R): Be²⁺ has very high polarizing power due to its small size.