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1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
A chemical reaction: $A + B \rightarrow AB , \,B$ is acting as limiting reagent then choose the correct option. The limiting reagent is :
  • A
    $A$ $-$ $50$ atom, $B$ $-$ $100$ atom
  • B
    $A$ $-$ $100$ atom, $B$ $-$ $200$ atom
  • ✓
    $A$ $-$ $100$ atom, $B$ $-$ $200$ atom
  • D
    $A$ $-$ $100$ atom =, $B$ $-$ $200$ atom
✓

Answer

Correct option: C.
$A$ $-$ $100$ atom, $B$ $-$ $200$ atom
c
First divide the number of moles by their stoichiometric coefficient to get the limiting reagent. Reacting species which come out be lowest will be the limiting reagent.

$\frac{\frac{50}{ N _{ A }}}{1}>\frac{\frac{30}{ N _{ A }}}{1}$

Hence, the limiting reagent is $C$.

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