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Select the correct order for the given p...

Select the correct order for the given properties -
(I) Thermal stability:
`BaSO_(4) gt SrSO_(4) gt CaSO_(4) gt MgSO_(4)`
(II) Basic Nature :
`ZnO gt BeO gt MgO gt CaO`
(III) Solubility in water :
`LiOH gt NaOH gt KOH gt RbOH`
(IV) Melting point :
`NaCl gt KCl gt RbCl gt LiCl`

A

I, IV

B

I, II and IV

C

II, III

D

All are correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the given properties and their respective orders. Let's break it down step by step. ### Step 1: Analyze Thermal Stability **Given Order:** BaSO₄ > SrSO₄ > CaSO₄ > MgSO₄ - **Explanation:** The thermal stability of sulfates generally increases with the size of the cation. Larger cations have lower charge density, leading to weaker lattice energy and thus higher thermal stability. - **Correct Order:** The order is correct because barium (Ba²⁺) is the largest cation, followed by strontium (Sr²⁺), calcium (Ca²⁺), and magnesium (Mg²⁺). ### Step 2: Analyze Basic Nature **Given Order:** ZnO > BeO > MgO > CaO - **Explanation:** Basicity increases down the group in the alkaline earth metals. However, ZnO is amphoteric and should be less basic than the other oxides listed. - **Correct Order:** The correct order should be CaO > MgO > BeO > ZnO. ### Step 3: Analyze Solubility in Water **Given Order:** LiOH > NaOH > KOH > RbOH - **Explanation:** The solubility of hydroxides in water increases with the size of the cation. Smaller cations form more covalent bonds, making them less soluble. - **Correct Order:** The correct order should be RbOH > KOH > NaOH > LiOH. ### Step 4: Analyze Melting Point **Given Order:** NaCl > KCl > RbCl > LiCl - **Explanation:** The melting point of ionic compounds is influenced by lattice energy, which is higher for smaller cations. Thus, smaller cations lead to higher melting points. - **Correct Order:** The correct order should be LiCl > NaCl > KCl > RbCl. ### Conclusion Based on the analysis: 1. **Thermal Stability:** Correct as given. 2. **Basic Nature:** Incorrect as given; should be CaO > MgO > BeO > ZnO. 3. **Solubility in Water:** Incorrect as given; should be RbOH > KOH > NaOH > LiOH. 4. **Melting Point:** Incorrect as given; should be LiCl > NaCl > KCl > RbCl. ### Final Answer The correct orders for the properties are: - (I) Thermal stability: BaSO₄ > SrSO₄ > CaSO₄ > MgSO₄ (Correct) - (II) Basic Nature: CaO > MgO > BeO > ZnO (Incorrect as given) - (III) Solubility in water: RbOH > KOH > NaOH > LiOH (Incorrect as given) - (IV) Melting point: LiCl > NaCl > KCl > RbCl (Incorrect as given)
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