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Size of Atoms and Ions

Arrange the f...

Question

Arrange the following in increasing order of atomic size- Boron, Aluminium ,gallium ,indium, titanium? (with reason)

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Solution

B < Ga < Al < In < Tl Ga small due to d contraction

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Q. Which element would be expected to have highest electro-negativity :

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Q. Consider the following statements and arrange in the order of true/false as given in the codes:

S_{1}

: Oxides of boron

(B_{2} O_{3})

(S i O_{2})

are acidic in nature.

S_{2}

: Oxides of aluminium

(A l_{2} O_{3})

(G a_{2} O_{3})

are amphoteric in nature.

S_{3}

: Oxides of indium

(l n_{2} O_{3})

(T l_{2} O_{3})

are basic in nature.

S_{4}

: Oxides of germanium

(G e O_{2})

(S n O_{2})

are acidic in nature.

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I. Boron trioxide is acidic.
II. Oxides of aluminium and gallium are amphoteric.
III. Oxides of indium and thallium are basic.

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