JEE MAIN - Chemistry (2021 - 18th March Morning Shift - No. 14)
Given below are two statements : One is labelled as Assertion A and the other labelled as reason R
Assertion A : During the boiling of water having temporary hardness, Mg(HCO3)2 is converted to MgCO3.
Reason R : The solubility product of Mg(OH)2 is greater than that of MgCO3.
In the light of the above statements, choose the most appropriate answer from the options given below :
Assertion A : During the boiling of water having temporary hardness, Mg(HCO3)2 is converted to MgCO3.
Reason R : The solubility product of Mg(OH)2 is greater than that of MgCO3.
In the light of the above statements, choose the most appropriate answer from the options given below :
Both A and R are true but R is not the correct explanation of A
A is true but R is false
Both A and R are true and R is the correct explanation of A
A is false but R is true
Explanation
A : For temporary hardness,
Mg(HCO3)2 $$\buildrel {heating} \over \longrightarrow $$ Mg(OH)2 + 2CO2 Assertion is false. MgCO3 has high solubility product than Mg(OH)2.
R : MgCO3 is more water soluble than Mg(OH)2.
KSP(Mg(OH)2) = 1.8 × 10–11
KSP(MgCO3) = 3.5 × 10–8
Mg(HCO3)2 $$\buildrel {heating} \over \longrightarrow $$ Mg(OH)2 + 2CO2 Assertion is false. MgCO3 has high solubility product than Mg(OH)2.
R : MgCO3 is more water soluble than Mg(OH)2.
KSP(Mg(OH)2) = 1.8 × 10–11
KSP(MgCO3) = 3.5 × 10–8
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