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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.

 

(iii) Identify the correct chemical reaction.
1 Hydrogen sulphide gas burns in air to give water and sulphur.  
2 Potassium metal reacts with water to give potassium hydroxide and water.  
3 Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.  
4 Zinc reacts with silver nitrate to form zinc nitrite and silver.  

Ans.

(3)

Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.