1. Two elements A & B have valencies 2&3. write the formula of their respective oxides.
2. write the chemical formula and name the elements which constitute the compounds:
a) Sodium Sulphate
b) Calcium Phosphate

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Solution

$1 . T w o e l e m e n t s A a n d B h a v e v a l e n c i e s 2 a n d 3 . T h e y h a v e t h e f o r m u l a A^{2} B^{3} C r o s s m u l t i p l y A_{3} B_{2} 2 . S o d i u m s u l p h a t e T h e e l e m e n t s a r e s o d i u m, s u l p h u r a n d o x y g e n N a^{1} S {O_{4}}^{2} W h e n y o u c r o s s m u l t i p l y, N a_{2} S O_{4} C a l c i u m p h o s p h a t e T h e e l e m e n t s a r e c a l c i u m, p h o s p h o r o u s a n d o x y g e n C a^{2} P {O_{4}}^{3} C r o s s m u l t i p l y C a_{3} (P O_{4})_{2}$

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