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Surface Chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry1 Mark
MCQ
A catalyst:
  • A
    Changes $\triangle \text{G}\triangle \text{G}$ for an equation.
  • B
    Acts by increasing the rate of the forward reaction more than the reverse reaction.
  • C
    Raises the equilibrium constant of a system.
  • ✓
    May have a molecular weight as low as $1$ or higher than $200, 000.$
✓

Answer

Correct option: D.
May have a molecular weight as low as $1$ or higher than $200, 000.$
A catalyst :
Does not change $\triangle \text{G}$ for a reaction.
Acts by increasing the rate of forward reaction and backward reaction by equal amounts.
Does not affect the value of equilibrium constant.
May have a molecular weight as low as $1$ or higher than $200, 000.$
$\therefore$ The only correct choice is that a catalyst may have a molecular weight as low as $1$ or higher than $200, 000.$

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