alleryIf 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: B. Neither, both are exact
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'_
Keep practising Mole Concept and Stoichiometry
Browse all Mole Concept and Stoichiometry questions for ICSE Class 10, or explore more Chemistry topics.
Related questions
Match each empirical formula problem with the calculated empirical formula:Match each quantity with its number of moles:Match each molecular calculation formula with its expression:Match each stoichiometric gas relationship at STP (0°C, 1 atm):Which ratio leaves no reactant in excess after completion?Under ideal-gas conditions, what can be said about gas volume ratios in a reaction?Why are molar masses of natural elements often not whole numbers?For a pure sample, what quantity is found by dividing mass by molar mass?