The number of correct options is (a) Cl2O7>SO3>P2O5>SiO2 (acidic strength) (b) Tl2O3>Tl2O>Ga2O3>Al2O3 (basic strength) (c) CsCl>RbCl>KCl>NaCl (ionic character) (d) H2O>HF>NH3 (melting point) (e) H2O>HF>NH3 (boiling point)

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answer is 3.

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Detailed Solution

(a) Correct.(b) Wrong. Correct order: Tl2O>Tl2O3>Ga2O3>Al2O3.(c) Correct.(d) Wrong. Correct order: H2O>NH3>HF.(e) Correct.

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