Question

This one gets a +25 Q1. State the type of reaction in the following chemical changes: i) Ammonia and hydrogen chloride react to form ammonium chloride. ii) Chlorine gas is passed through a solution of potassium iodide. iii) Silver nitrate solution and sodium chloride solution are mixed together in a test tube. iv) Lead nitrate crystals are heated in a test tube. Q2. State one important observation in each of the following: i) Zinc carbonate is heated in a test tube. ii) An iron nail is dropped in copper sulfate solution.

Answer 1

1. Answers:

i)  Combination reaction (two reactants form a single product)

     NH₃ + HCl = NH₄Cl

ii)  It is a Displacement reaction, since the Iodide ion is replaced by a chlorine atom, which is more reactive

     2KI  +  Cl₂  =  2KCl   +   I₂

iii)  It is a double displacement reaction, since the chloride ion is replaced to silver and the nitrate ion is displaced to sodium

       NaCl  + AgNO₃ = AgCl  +  NaNO₃

iv)  It is a decomposition reaction, since one reactant (Pb(NO₃)₂) forms two products (PbO and NO₂)

        2Pb(NO₃)₂ =  2PbO + 4NO₂ + O₂

2. Answers:

i)  It forms ZnO (Zinc oxide) and a gas that turns lime water milky (CO₂)

    ZnCO₃ = ZnO  +  CO₂

ii) The copper gets deposited on the iron nail and the blue colour copper sulphate solution changes to green colour ferrous sulphate solution, since iron is more reactive than copper, it displaces copper from its salt solution (copper sulphate)

      CuSO₄  +  Fe = FeSO₄  +  Cu

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