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Give the formulae of the compounds formed from the following set of elements.

(i) Carbon and hydrogen

(ii) Nitrogen and magnesium

(iii) Sodium and phosphorus

(iv) Potassium and oxygen

(v) Boron and oxygen

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(i) Carbon and hydrogen: 

CH4 (methane) 

C2H6 (ethane) 

(ii) Nitrogen and magnesium: 

Magnesium nitrate 

Formula: Mg3(NO3)2 

(iii) Sodium and phosphorus:

Sodium phosphate 

Formula: Na3PO4 

(iv) Potassium and oxygen: 

Potassium oxide 

Formula: K2O

(v) Boron and oxygen: 

Boron oxide 

Formula: B2O3

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