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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
Combustion of glucose $\left(\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6\right)$ produces $\mathrm{CO}_2$ and water. The amount of oxygen (in $\mathrm{g}$ ) required for the complete combustion of $900 \mathrm{~g}$ of glucose is:

[Molar mass of glucose in $\mathrm{g} \mathrm{mol}^{-1}=180$ ]

  • A
    $480$
  • ✓
    $960$
  • C
    $800$
  • D
    $32$
✓

Answer

Correct option: B.
$960$
b
$\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_{6(\mathrm{~s})}+6 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 6 \mathrm{CO}_{2(\mathrm{~g})}+6 \mathrm{H}_2 \mathrm{O}_{(\ell)}$

$\frac{900}{180} $

$=5 \mathrm{~mol} \quad 30 \mathrm{~mol}$

$\text { Mass of } \mathrm{O}_2 \text { required }=30 \times 32=960 \mathrm{gm}$

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