Chemistry Laboratory Techniques 1 Quiz (2025)

A 0.005 M solution of CuSO₄ is prepared. What mass of CuSO₄ is required to make 150 mL of this solution? (Given: CuSO₄ Mr = 159.5)

• 0.1196 g

• 0.2393 g

• 0.4785 g

• 0.0598 g

What is the equivalence point in a titration?

• The point where the indicator changes color

• The point where the moles of acid equal the moles of base

• The point where the pH is 7

• The point where the solution becomes neutral

For the reaction: Cr2O72- + 14H+ + 6ē→ 2Cr3+ + 7H2O, what is the oxidation state of Cr in Cr2O72-?

• +3

• +6

• +7

• +2

Which of the following is the best and safest heating method for heating inflammable liquids with low boiling point and suitable for long periods of heating?

• Water bath

• Labo gas

• Heating mantle

• Steam bath

The liquid which passes through the filter is called _________________, and the material which is retained is referred as the __________________.

• Filtrate, Residue

• Effluent, Eluents

• Residue, Filtrate

• Eluents, Effluent

Which condenser type is preferred for liquids with boiling points of 150oC or more?

• Davies condenser

• Air condenser

• Water cooled condenser

• Graham type condenser

Which one of the mixtures can be separated using simple distillation?

• 86 ^o C, 45 ^o C

• 123^o C, 100^o C

• 130^o C, 200^o C

• 200^o C, 210^o C

Which of the following best describe the chromatographic method?

• Separation method based on the difference in solubility of compound formed

• Separation method based on the difference in volatility of compounds

• Separation method based on the difference in rate of movement of a solute through a stationary phase

• Separation method on the difference in interaction with a field or gradient applied perpendicular to transport direction

Substance A was detected first in the detector in gas-liquid chromatography. What can be concluded about Substance A in this chromatographic method?

• Substance A has high solubility towards the liquid stationary phase

• Substance A has low partition coefficient towards the liquid stationary phase

• Substance A has low solubility towards the liquid mobile phase

• Substance A has low partition coefficient towards the liquid mobile phase

Which of the following are classified as column chromatographic methods?

• High performance liquid chromatography and gas chromatography

• Gas chromatography and thin-layer chromatography

• Paper chromatography and column chromatography

• Thin-layer chromatography and paper chromatography