SAMPLE CHEMISTRY QUESTIONS FROM PAKPREP.COM

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Topic:

Reaction Kinetics

Question:

For homogeneous catalysis reaction between liquids, the catalyst should be of which form?

Options:

  • Solid
  • Liquid
  • Gas
  • Can be any of the above

Correct Answer:

Liquid

Explanation:

In chemistry, homogeneous catalysis is a sequence of reactions that involve a catalyst in the same phase as the reactants. Phase here refers to solid, liquid, vs gas. Most commonly, a homogeneous catalyst is co-dissolved in a solvent with the reactants.

Topic:

Solutions

Question:

If we have 450g of a NaCL solution that is 35 NaCL w/w %. What is the mass of NaCL?

Options:

  • 128.5 g
  • 129.5 g
  • 157.5 g
  • 131.5 g

Correct Answer:

157.5 g

Explanation:

% by weight = (Mass of solute/Mass of solution) * 100

35 = (X/450) *100

X = 35 * 450/100 = 157.5 g

Topic:

Basics of Chemistry

Question:

Non-stoichiometric compounds are formed by:

Options:

  • Only alkali metals
  • Only transition elements
  • Only noble gases
  • None of the above

Correct Option:

Only transition elements

Explanation:

Binary transition metal compounds, such as the oxides and sulfides, are usually written with idealized stoichiometry’s, such as FeO or FeS but these compounds are usually cation deficient and mostly never contain a 1:1 cation:anion ratio. Thus a substance such as ferrous oxide is actually a nonstoichiometric compound with a range of compositions.

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