First slide

Alkaline earth metals

Question

Select the correct statements about CaO.

Moderate

A

Its aqueous solution can absorb CO₂
B

It is used as refractory
C

It can remove temporary hardness
D

AII of the above are correct statements

Solution

$(1) Ca (OH)_{2} + {CO}_{2} ⟶ {CaCO}_{3} + H_{2} O - (Correct)$
(2) Correct
(3) $CaO + Ca {({HCO}_{3})}_{2} ⟶ 2 {CaCO}_{3} + H_{2} O - (Correct)$

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