1.LESSON:1 Chemical equations and reactionsComplete the missing components/variables given as x and y in the following reactions:(a) Pb(NO3)2 (aq) + 2KI(aq) → Pbl2 (x) + 2KNO3 (y)(b) Cu(s) + 2Ag NO3 (aq) + Cu(NO3)2 (aq) + x(s)(c) Zn(s) + H2SO4 (aq) → ZnSO4 (x) + H2 (y)A solution of potassium chloride when mixed with silver nitrate solution, an insoluble whitesubstance is formed. Write the chemical reaction involved and the type of reaction.4.Why do we store silver chloride in dark coloured bottles?Give the characteristic tests for the following gases (a) CO2 (b) O2 (c) H2What happens when a piece of (a) zinc metal is added to copper sulphate solution.(b) aluminium metal is added to dilute hydrochloric acid? (c) silver metal is added to coppersulphate solution? Also, write the balanced chemical equation if the reaction occurs.What happens when zinc granules are treated with dilute solution of H2SO4 , HCl, HNO3 , NaCland NaOH, also write the chemical equations if reaction occurs.​