Which one of the following reaction is not balanced?

2KI + H₂O₂ → 2KOH + I₂

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CaCO₃ → CaO + CO₂

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Mg + 2HCl → MgCl₂ + H₂

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2Fe + 3H₂O → Fe₂O₃ + H₂

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Solution

The correct option is D
2Fe + 3H₂O → Fe₂O₃ + H₂

There are 6 hydrogen atoms on the reactant side while only 2 hydrogen atoms on the product side. To balance the hydrogen atoms, 3 should be written as a co-efficient of the hydrogen atoms present on the product side.

2Fe + 3H₂O → Fe₂O₃ + 3H₂

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Similar questions

Q. In which of the following reactions

H_{2} O_{2}

is a reducing agent

M g (s) + 2 H C l \to M g C l_{2} + H_{2}

(g).This is the metal and acid reaction to produce hydrogen gas.Name the type of reaction:

Which of the following is not an example of redox reaction?
(a) $C u O + H_{2} \to C u + H_{2} O$
(b) $F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}$
(c) $2 K + F_{2} \to 2 K F$
(d) $B a C l_{2} + H_{2} S O_{4} \to B a S O_{4} + 2 H C l$

Reaction:

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

How many moles of hydrogen gas is produced from 1 mole of

M g

What information does the following chemical equations convey ?

(a) $Z n$ + $H_{2} S O_{4}$ $\to$ $Z n S O_{4}$ + $H_{2}$

(b) $M g$ + $2 H C l$ $\to$ $M g C l_{2}$ + $H_{2}$

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Which one of the following reaction is not balanced?

The correct option is D 2Fe + 3H2O → Fe2O3 + H2There are 6 hydrogen atoms on the reactant side while only 2 hydrogen atoms on the product side. To balance the hydrogen atoms, 3 should be written as a co-efficient of the hydrogen atoms present on the product side. 2Fe + 3H2O → Fe2O3 + 3H2