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NTA Abhyas JEE Main2020ChemistryPractical ChemistryPractice

Pick out the incorrect statement.

Options

  1. AMg also burns in gases such as C O 2 and S O 2
  2. BExcess of C O 2 when passed in lime-water turns it milky
  3. CM g C l 2 . 6 H 2 O on heating hydrolyses to form MgO (magnesia), which is refractory
  4. DAlkaline-earth metals are denser and harder than alkali metals

Correct answer

B. Excess of C O 2 when passed in lime-water turns it milky

Step-by-step solution

Here statement in option B is incorrect as when C O 2 is passed in lime-water, it becomes milky due to the formation of C a C O 3 but excess of C O 2 leads to the formation of clear solution, due to the formation of soluble C a ( H C O 3 ) 2 . A. M g + C O 2 → 2 M g O + C and 2 M g + S O 2 → 2 M g O + S D. Inter-atomic forces (or metallic bonding) in alkaline-earth metals are stronger than in alkali metals.

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