Explain why: (i) Transition elements form alloys.(ii) Zn2+ salts are

1.	Explain why: (i) Transition elements form alloys.(ii) Zn2+ salts are white whereas Cu2+ salts are coloured. (iii) Transition metals and their compounds act as a catalyst.
Answer» (i) This is because transition metals have similar atomic radii and form substitutional alloys. (ii) Zn²⁺(3d¹⁰) salts have no impaired electrons but Cu^2- (3d⁹) salts have one unpaired electrons. Hence Zn²⁺ salts are white while Cu^2- salts are coloured. (iii) This is because of transition metals • have a number of unpaired electrons in their (n-1) d-orbitals • can show variable oxidation states. • form intermediates and provide a new reaction path having lower energy of activation. • they can adsorb one of the reactants on their surfaces.

Explain why: (i) Transition elements form alloys.(ii) Zn2+ salts are white whereas Cu2+ salts are coloured. (iii) Transition metals and their compounds act as a catalyst.

Answer»

(i) This is because transition metals have similar atomic radii and form substitutional alloys.

(ii) Zn²⁺(3d¹⁰) salts have no impaired electrons but Cu^2- (3d⁹) salts have one unpaired electrons. Hence Zn²⁺ salts are white while Cu^2- salts are coloured.

(iii) This is because of transition metals

• have a number of unpaired electrons in their (n-1) d-orbitals

• can show variable oxidation states.

• form intermediates and provide a new reaction path having lower energy of activation.

• they can adsorb one of the reactants on their surfaces.

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