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2 - Mixtures and Separation

Question 1 of 210 correct · 0 wrong

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✅EvaluateQuestion 1 of 21

Which of the following is not a pure substance?

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✅EvaluateQuestion 2 of 21

The main difference between a compound and a mixture is that:

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✅EvaluateQuestion 3 of 21

Which of the following represents a homogeneous mixture?

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✅EvaluateQuestion 4 of 21

What type of mixture is milk?

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✅EvaluateQuestion 5 of 21

Solubility is defined as:

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✅EvaluateQuestion 6 of 21

Which separation technique is used to obtain salt from seawater?

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✅EvaluateQuestion 7 of 21

When lime is added during sugar cane juice processing, its main purpose is to:

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✅EvaluateQuestion 8 of 21

Which of the following mixtures can be separated by a separating funnel?

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✅EvaluateQuestion 9 of 21

Which of the following will increase the solubility of most solids in water?

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✅EvaluateQuestion 10 of 21

A student filters muddy water and obtains clear liquid. The solid left on the filter paper is called the:

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✅EvaluateQuestion 11 of 21

Which method is used to obtain pure water from salt solution?

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✅EvaluateQuestion 12 of 21

Which feature best distinguishes a solution from a suspension?

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✅EvaluateQuestion 13 of 21

Which statement correctly describes a saturated solution?

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✅EvaluateQuestion 14 of 21

Which physical property allows fractional distillation to separate ethanol and water?

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✅EvaluateQuestion 15 of 21

A sugar factory uses vacuum distillation to remove water from sugar solution. Why is a vacuum used?

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✅EvaluateQuestion 16 of 21

A student dissolves 40 g of salt in 100 g of water at 60 °C. When cooled to 20 °C, only 35 g remain dissolved. What forms during cooling?

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✅EvaluateQuestion 17 of 21

A mixture of sand, salt, and iron filings can best be separated by:

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✅EvaluateQuestion 18 of 21

In chromatography, coloured dyes separate because:

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✅EvaluateQuestion 19 of 21

Which mixture type would scatter light when a beam passes through it but does not settle on standing?

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✅EvaluateQuestion 20 of 21

In an experiment, 10 g of potassium nitrate dissolves in 50 g of water at 30 °C, but 15 g dissolve at 60 °C. This shows that:

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✅EvaluateQuestion 21 of 21

A sugar cane solution is filtered after lime treatment, then evaporated and crystallised. Which sequence of separation methods does this represent?

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✅EvaluateQuestion 1 of 21

Which of the following is not a pure substance?

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