Download App

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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
$108\,g\,Al$ and $213\,g\,MnO$ was heated to initiate the reaction 

$2 Al + 3MnO \to Al_2O_3 + 3Mn$

Which of the following is correct? (Atomic weights of $Mn = 55$ and $Al = 27$)

  • A
    $Al$ is limiting reagent
  • ✓
    $102\,g\,Al_2O_3$ is formed
  • C
    $MnO$ is excess reagent
  • D
    None of these
✓

Answer

Correct option: B.
$102\,g\,Al_2O_3$ is formed
b
$\begin{gathered}
  \mathop {}\limits_{Moles\,\,:\,} \mathop {2Al}\limits_{4\,moles}  + \mathop {3MnO}\limits_{3\,moles}  \to A{l_2}{O_3} + 3Mn \hfill \\
   \hfill \\ 
\end{gathered} $

$\frac{n}{\text { st. coefficient }}: \frac{4}{2}>\frac{3}{3}$

$MnO$ is limiting reagent

$\mathrm{n}_{\mathrm{A} \mathrm{l}_{2} \mathrm{O}_{3}}=1\, \mathrm{mole}$

$\mathrm{n}_{\mathrm{Al}_{2} \mathrm{O}_{3}}=1 \times 102 \,\mathrm{g}=102 \,\mathrm{g}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 1. Some basic concept of chemistry→1. Some basic concept of chemistry — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Pnicogens are the elements of group:
→
For the chemical equilibrium,  $CaC{{O}_{3}}_{(s)})$ $\rightleftharpoons$ $CaO_{(s)}+C{{O}_{2}}_{(g)},\ \Delta H_{r}^{{}^\circ }$ can be determined from which one of the following plots
→
Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule?
→
Which or these have no unit
→
Which of the following is $INCORRECT$ 
→
Which of the following is not an aromatic compound :
→
What is the $IUPAC$ name of the following compound ?
→
Consider the following statements : A hydrocarbon of molecular formula $C_5H_{10}$ is a

$I.$    monosubstituted alkene

$II.$   disubstituted alkene

$III.$  trisubstituted alkene

Which of the following statement(s) is(are) correct ?

→
Which one of the following has a polarizing power close to that of $Mg$?
→
The enthalpy change $(\Delta H)$ for the reaction $N_2(g) + 3H_2(g) \to 2NH_3(g)$ is $-92.38\, kJ$ at $298\, K$. The internal energy change $\Delta U$ at $298\, K$ is......$kJ$
→