Identify the chemical equations which is not balanced:

6 H N O_{3} + S \to H_{2} S O_{4} + 6 N O_{2} + 2 H_{2} O

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K_{2} C r_{2} O_{7} + 6 H C l

\to 2 K C l + C r C l_{3} + 7 H_{2} O + C l_{2}

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2 C a_{3} (P O_{4})_{2} + 6 S i O_{2} + 10 C

\to 6 C a S i O_{3} + P_{4} + 10 C O

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2 K M n O_{4} + 5 S O_{2} + 2 H_{2} O

\to K_{2} S O_{4} + 2 M n S O_{4} + 2 H_{2} S O_{4}

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Solution

The correct option is B $K_{2} C r_{2} O_{7} + 6 H C l$ $\to 2 K C l + C r C l_{3} + 7 H_{2} O + C l_{2}$
The chemical equation $K_{2} C r_{2} O_{7} + 6 H C l \to 2 K C l + C r C l_{3} + 7 H_{2} O + C l_{2}$ is not perfectly balanced. As we all know that in a balanced equation no of atoms present in the reactant part should be same with the no of atoms present in the product part. But in this given equation there are 2 chromium atoms in the reactant side but only one chromium atom is present in the product side. So the correct option is B

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