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JEE Main 202118 MarchMorning Shift
Exam
JEE Main
Year
2021
Date
18 March
Shift
Morning Shift
Subject
Chemistry
Chapter
Hydrogen

JEE Main 2021 · 18 March · Morning Shift · Chemistry · Hydrogen

Given below are two statements: One is labelled as Assertion A and...

Given below are two statements: One is labelled as Assertion A and the other labelled as reason RR

Assertion A:A: During the boiling of water having temporary hardness, Mg(HCO3)2Mg{\left({HCO}_{3}\right)}_{2} is converted to MgCO3{MgCO}_{3}

Reason R:R: The solubility product of Mg(OH)2Mg ( OH{)}_{2} is greater than that of MgCO3{MgCO}_{3}.

In the light of the above statements, choose the most appropriate answer from the options given below:

Options

  1. ABoth AA and RR are true but RR is not the correct explanation of AA
  2. BAA is true but RR is false
  3. CBoth AA and RR are true and RR is the correct explanation of AA
  4. DAA and R both are false.

Correct answer

D. AA and R both are false.

Step-by-step solution

For temporary hardness, Mg{\left({HCO}_{3}\right)}_{2}\overset{\text{heating}}{⟶}Mg{\left(OH\right)}_{2} ↓ + 2{CO}_{2} ↑
Assertion is false. MgCO3{MgCO}_{3} has high solubility product than Mg(OH)2.Mg ( OH{)}_{2} .
According to data of NCERT table 7.97 . 9 (Equilibrium chapter), the solubility product of magnesium carbonate is 3.5×10−83 . 5 × {10}^{- 8} and solubility product of Mg(OH)2Mg ( OH{)}_{2} is 1.8×10−111 . 8 × {10}^{- 11} Hence Reason is incorrect.

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