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(a) Write chemical equations which show what happens when the following substances are mixed with water (i) Nitrous acid (ii) The hydride ion (iii) Potassium sulfate 3 (b) For each of the following chemical reactions, write a formula (molecular) equation, complete ionic equation and net ionic equation: (i) Magnesium hydroxide reacts with hydrobromic acid (ii) An alkali metal phosphate reacts with mercury(I) nitrate