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Substance X is white crystalline solid w...

Substance X is white crystalline solid which melts after 10 seconds on burner flame. It is soluble in water and insoluble in `"CCl"_4`. It is a poor conductor of electricity in molten state as well as in the form of aqueous solution, hence we conclude that substance X is :

A

an ionic compound

B

a non polar covalent compound

C

a polar covalent compound

D

a pure element

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To determine the identity of substance X based on the given properties, we can analyze the information step by step. ### Step 1: Analyze the Physical State and Melting Point Substance X is described as a white crystalline solid that melts after 10 seconds on a burner flame. The fact that it melts quickly suggests that it has a relatively low melting point. **Hint:** Consider the types of substances that are typically crystalline and have low melting points. ### Step 2: Solubility in Water and CCl4 Substance X is soluble in water but insoluble in carbon tetrachloride (CCl4). This indicates that substance X is likely polar because polar substances tend to dissolve well in polar solvents like water. Conversely, being insoluble in CCl4 suggests that substance X does not have non-polar characteristics. **Hint:** Remember the principle of "like dissolves like" when considering solubility. ### Step 3: Electrical Conductivity Substance X is described as a poor conductor of electricity in both its molten state and as an aqueous solution. This suggests that it does not dissociate into free ions when dissolved in water, which is a characteristic of ionic compounds. Instead, it likely forms a covalent compound. **Hint:** Think about the types of compounds that do not conduct electricity well and consider their bonding characteristics. ### Step 4: Conclusion Based on the analysis: - Substance X is a white crystalline solid with a low melting point. - It is soluble in water (indicating polar characteristics) and insoluble in CCl4 (indicating non-polar characteristics). - It is a poor conductor of electricity in both molten and aqueous states, suggesting it is a covalent compound. From these observations, we can conclude that substance X is likely a polar covalent compound. **Final Answer:** Substance X is a polar covalent compound.
To determine the identity of substance X based on the given properties, we can analyze the information step by step. ### Step 1: Analyze the Physical State and Melting Point Substance X is described as a white crystalline solid that melts after 10 seconds on a burner flame. The fact that it melts quickly suggests that it has a relatively low melting point. **Hint:** Consider the types of substances that are typically crystalline and have low melting points. ### Step 2: Solubility in Water and CCl4 ...
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