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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

 

Equations must always be balanced. The numbers of atoms of each type involved in a chemical reaction are the same on the reactant and product sides of the equation.
In a combination reaction, two or more substances combine to form a new single substance. In a decomposition reaction, a single substance decomposes to give two or more substances. When an element displaces another element from its compound, a displacement reaction occurs. Reactions also involve gain or loss of oxygen or hydrogen by substances. Oxidation = gain of oxygen or loss of hydrogen. Reduction = loss of oxygen or gain of hydrogen.

 

(ii) Which of the following is not a displacement reaction
1 Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water  
2 Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride  
3 Aluminium + Copper chloride → Aluminium chloride + Copper  
4 Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)

   

Ans.

(1)