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If 4 moles of A react with 6 moles of B as 2A + 3B -> 2C, which reactant is in excess?
AA is in excess
BNeither, both are exact
CB is in excess
DCannot decide in general usage
Answer & Solution
Correct answer: A. A is in excess
1. The mole ratio in the equation is 2 A : 3 B.
2. We have 4 A and 6 B.
3. 4 A would need 6 B by ratio (4 * 3/2 = 6).
4. So both reactants are present in stoichiometric ratio.
5. Neither is in excess.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 5 'Mole Concept and Stoichiometry'_
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