GK QUESTION#3183

Assertion (A): Silicon dioxide has a high melting point due to strong covalent bonds throughout its structure. Reason (R): Silicon dioxide is made up of small, discrete molecules held by weak forces.

ABoth A and R are true, and R is the correct explanation of A
BBoth A and R are true, but R is not the correct explanation of A
CA is true, but R is falseCorrect answer
DA is false, but R is true

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Answer

C. A is true, but R is false

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Explanation

Ordinary solid silica has an extended covalent network rather than separate small SiO₂ molecules held by weak intermolecular forces. Disrupting the strong network requires considerable energy, consistent with its high melting temperature. Thus the assertion is true and the reason false.

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Assertion (A): Silicon dioxide has a high melting point due to strong covalent bonds throughout its structure. Reason (R): Silicon dioxide is made up of small, discrete molecules held by weak forces.

Answer

Explanation

Assertion (A): Silicon dioxide has a high melting point due to strong covalent bonds throughout its structure. Reason (R): Silicon dioxide is made up of small, discrete molecules held by weak forces.

Answer

Explanation

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