Q5 of 75 Page 57

An element X forms X2(CO3)3 type compound. What is the formula of its phosphate and chloride?

X2(CO3)3


From this, we came to know that valency of X is 3+


The formula for the phosphate of the element X:



Formula: X3(PO4)3 or XPO4


The formula for the chloride of the element X:



Formula: XCl3


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Give symbol and valency of the following ions.

Hydroxide ion, carbonate ion.

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What is the role of valency in the combination of atoms?

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Write the formula of the following compounds.

(i) Magnesium sulphate


(ii) Sodium bromide


(iii) Calcium chloride


(iv) Potassium nitrate


(v) Sodium phosphate

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How formula unit mass is different from molecular mass?