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Question

Select the correct order for the given properties
I) Thermal Stability: BaSO4>SrSO4>CaSO4>MgSO4
II)
Basic Nature: ZnO>BeO>MgO>CaO
III)
Solubility in water: LiOH>NaOH>KOH>RbOH
IV)
Melting point: NaCl>KCl>RbCl>LiCl
  1. I, IV
  2. I, II and IV
  3. II, III
  4. All are correct


Solution

The correct option is A I, IV
I) Thermal Stability: BaSO4>SrSO4>CaSO4>MgSO4   Correct
II)
Basic Nature: ZnO>BeO>MgO>CaO        Incorrect
III)
Solubility in water: LiOH>NaOH>KOH>RbOH      Incorrect
IV)
Melting point: NaCl>KCl>RbCl>LiCl     Correct  
So answer is (A) I, IV

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