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The number of correct options is
${(a) Cl}_{2} O_{7} > S O_{3} > P_{2} O_{5} > S i O_{2} (acidic strength)$
$(b) {Tl}_{2} O_{3} > {Tl}_{2} O > {Ga}_{2} O_{3} > {Al}_{2} O_{3} (basic strength)$
$(c) CsCl > R b C l > K C l > N a C l (ionic character)$
$(d) H_{2} O > HF > {NH}_{3} (melting point)$
$(e) H_{2} O > HF > {NH}_{3} (boiling point)$

Moderate

Solution

(a) Correct.
(b) Wrong. Correct order: ${Tl}_{2} O > {Tl}_{2} O_{3} > {Ga}_{2} O_{3} > {Al}_{2} O_{3} .$
(c) Correct.
(d) Wrong. Correct order: $H_{2} O > {NH}_{3} > HF$ .
(e) Correct.

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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)

(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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(a) Correct.
(b) Wrong. Correct order: ${Tl}_{2} O > {Tl}_{2} O_{3} > {Ga}_{2} O_{3} > {Al}_{2} O_{3} .$
(c) Correct.
(d) Wrong. Correct order: $H_{2} O > {NH}_{3} > HF$ .
(e) Correct.