Test Preparation on s-block Elements-II-Chemistry Test Series For NEET-2020

Chemical A is used for water softening to remove temporary
hardness. A reacts with sodium carbonate to generate caustic
soda. When CO₂ is bubbled through a solution of A, it turns
cloudy. What is the chemical formula of A

(a) CaCO₃      (b) CaO
(c) Ca(OH)₂   (d) Ca(HCO₃ )₂

A solid compound ' X ' on heating gives CO₂ gas and a
residue. The residue mixed with water forms 'Y ' . On passing
an excess of CO₂ through 'Y ' in water, a clear solution, ' Z '
is obtained. On boiling ' Z ' , compound ' X ' is reformed. The
compound ' X ' is

(a) Na₂CO₃          (b) K₂CO₃
(c) Ca(HCO₃ )₂    (d) CaCO₃

On heating which of the following releases CO2 most easily

(a) K₂CO₃    (b) Na₂CO₃
(c) MgCO₃   (d) CaCO₃

Alkaline earth metals are denser than alkali metals, because
metallic bonding in alkaline earth metal, is

In which of the following the hydration energy is higher than
the lattice energy

(a) BaSO₄     (b) MgSO₄
(c) RaSO₄     (d) SrSO₄