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{:("Column I (Type of crystal)", "Column...

`{:("Column I (Type of crystal)", "Column II (Example/Property)"),("(A) Ionic solids" , "(p) Dry ice"),("(B) Molecular solids", "(q) Brass"),("(C) Covalent solids" , "(r) Generally insulators"),("(D) Metallic solids" , "(s) Generally have low melting points"):}`

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To solve the problem of matching the types of solids in Column I with their examples or properties in Column II, we will analyze each type of solid and its characteristics step by step. ### Step-by-Step Solution: 1. **Identify Ionic Solids:** - Ionic solids are characterized by their ionic bonds and typically have high melting points. However, in this context, we are looking for a property that matches with the options given. - **Match:** Ionic solids are generally insulators when not in solution or molten state. Therefore, we can match: - (A) Ionic solids → (r) Generally insulators. 2. **Identify Molecular Solids:** - Molecular solids are composed of molecules held together by intermolecular forces. They usually have lower melting points compared to ionic or covalent solids. - An example of a molecular solid is dry ice, which is solid carbon dioxide. - **Match:** Molecular solids can be matched with: - (B) Molecular solids → (p) Dry ice. 3. **Identify Covalent Solids:** - Covalent solids, also known as network solids, have a lattice structure formed by covalent bonds. They do not have free electrons, which makes them generally insulators. - **Match:** Covalent solids can be matched with: - (C) Covalent solids → (r) Generally insulators. 4. **Identify Metallic Solids:** - Metallic solids consist of metal atoms that are bonded by metallic bonds. They are good conductors of electricity and heat and can have various properties depending on the alloy. - Brass is an example of a metallic solid, which is an alloy of copper and zinc. - **Match:** Metallic solids can be matched with: - (D) Metallic solids → (q) Brass. ### Final Matching: - (A) Ionic solids → (r) Generally insulators - (B) Molecular solids → (p) Dry ice - (C) Covalent solids → (r) Generally insulators - (D) Metallic solids → (q) Brass ### Summary of Matches: - A → r - B → p - C → r - D → q
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