Chemistry

Which substance is least soluble at 20⁰C ?

• KClO₃

• K₂Cr₂O₇

• KCl

• NaCl

Which substance is most soluble at 90⁰C?

• KClO₃

• K₂Cr₂O₇

• KCl

• NaCl

Analyze the solubility curve given below and answer the following question: What is the solubility of NaCl at 100⁰C?

• 10g

• 20g

• 30g

• 40g

A saturated solution of sodium chloride (NaCl) at 80 ᴼC contains 40g of sodium chloride. If it is cooled to 10 ᴼC, then 35g can stay dissolved, what mass of blue copper sulfate crystals will form?

• 5g

• 10g

• 115g

• 324g

What is the effect of temperature on solubility of gases in liquids?

• Solubility of gases increases with decrease in temperature

• Solubility of gases decreases with increase in temperature

• Solubility of gases remain the same no matter the temperature

• Solubility of gases decreases with increase in temperature affecting the rate of solubility

If 10g of salt is added to 50g of pure water, what is the mass of the solution?

• 60g

• 50g

• 10g

• 40g

Which of the following factors affect dissolving of sugar in water?

• stirring

• temperature of solvent

• size of solute particles

• All of the above

9. Which method of separation used to separate sugar in its dry state from sugar solution?

• crystallization

• fractional distillation

• simple distillation

• evaporation

9. Which method of separation used to separate copper sulfate crystals from its solution?

• crystallization

• fractional distillation

• simple distillation

• evaporation

9. Which method of separation used to separate petrol from crude oil?

• crystallization

• fractional distillation

• simple distillation

• evaporation