Which of the following order is incorrect regarding the property given in a brackets: (1) Eu > Ce > Pr > Nd (Atomic size) (2) Eu >Gd>Ce>Pr (Magnetic moment) (3) Cl2O7> So3> P4O10>Al2O3 (Acidic strength) (4) HOCI> HOBr > HOI (Acidic strength)

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(1) (N H_{4})_{2} [C e (N O_{3})_{6}]

(2) G d (N O_{3})_{3}

(3) E u (N O_{3})_{3}

C e = 58, G d = 64 and E u = 63)

Among $A l_{2} O_{3}, S i O_{2}, P_{2} O_{3}, a n d S O_{3}$ , the correct order of acid strength is:

Among $A l_{2} O_{3}, S i O_{2}, P_{2} O_{3}, a n d S O_{3}$ the correct order of acid strength is

A l_{2} O_{3}, S i O_{2}, P_{2} O_{3} a n d S O_{3}

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