Equations must always be balanced. The numbers of atoms of each type involved in a chemical reacti

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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.

(i) Which of the following reactions is not correct

1 $Z n + C u S O_{4} \to Z n S O_{4} + C u$

2 $2 A g + C u {(N O_{3})}_{2} \to 2 A g N O_{3} + C u$

3 $F e + C u S O_{4} \to F e S O_{4} + C u$

4 $M g + 2 H C l \to M g C l_{2} + H_{2}$

Ans.
(2)

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