Write down the formulae of (i) aluminium...

Write down the formulae of (i) aluminium hydroxide, (ii) hydrogen sulphide (iii) ammonium sulphate, (iv) sodium carbonate (v) calcium phosphate, (vi) potassium chromate.

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Write the chemical formulae of the following: (a)Magnesium chloride (b)Calcium oxide (c )Sodium sulphide (d)Aluminium phosphate (e)potassium chloride (f)Calcium carbonate.

(a) What is an ion ? How is an ion formed ? Explain with the help of two examples of different ions. (b) The valencies (or charges) of some of the ions of are given below : Using this information, write down the formulae of the following compunds : (i) Sodium phosphate , (ii) Ammonium sulphate (iii) Calcium hydroxide , (iv) Lead bromide

Translate the following statements into chemical equations and then balance them. (i) Hydrogen gas combines with nitrogen to form ammonia. (ii) Hydrogen sulphide gas burns in air to give water and sulphur dioxide. (iii) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate. (iv) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

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