Assertion: When 4 moles of $H_{2}$ react with 2 moles of $O_{2}$ , then 4 moles of water is formed.
Reason: $O_{2}$ will act as the limiting reagent

Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.

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Both the assertion and the reason are false statements.

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The assertion is true, but the reason is false.

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Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.

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Solution

The correct option is C The assertion is true, but the reason is false.
$2 H_{2} + O_{2} \to 2 H_{2} O$
In this reaction, 2 moles of hydrogen react with 1 mole of oxygen to form 2 moles of water.
Similarly, 4 moles of hydrogen react with 2 moles of oxygen to form 4 moles of water.
Since the reactants are present in stoichiometric ratios, there are no limiting reagents.

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Limiting Reagent or Reactant

Standard XII Chemistry

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Assertion: When 4 moles of H2 react with 2 moles of O2, then 4 moles of water is formed. Reason: O2 will act as the limiting reagent

Assertion: When 4 moles of $H_{2}$ react with 2 moles of $O_{2}$ , then 4 moles of water is formed.
Reason: $O_{2}$ will act as the limiting reagent