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Half Book 2

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1. Waseem is collecting data on the melting points of different substances. He wants to compare the melting points. Which type of graph is most appropriate?

A Line graph

B Pie chart

C Bar graph

D Scatter plot

2. Julia is studying air quality indices. She understands that the AQI provides information about air quality. What does the AQI measure?

A Only ozone levels

B Concentrations of major air pollutants

C Only particulate matter

D Carbon dioxide levels

3. Which phase remains fixed in chromatography?

A Mobile phase

B Liquid phase

C Stationary phase

D Gas phase

4. Which gas has a pungent smell and turns red litmus blue?

A CO₂

B NH₃

C H₂

D SO₂

5. Which hydrocarbon has the molecular formula C2H4?

A Ethane

B Ethene

C Ethyne

D Methane

6. Yusuf is analyzing data from an experiment and calculates the standard deviation. What does the standard deviation measure?

A The average of the data

B The spread of data around the mean

C The most frequent value

D The difference between the maximum and minimum values

7. Xia is studying aldehydes and ketones. She learns that aldehydes contain a carbonyl group at the end of a carbon chain. Which of the following is an aldehyde?

A Acetone

B Acetaldehyde

C Ethanol

D Acetic acid

8. Which chromatography is faster?

A Paper chromatography

B Thin-layer chromatography

C Distillation

D Filtration

9. Which pair represents structural isomers?

A Ethane and propane

B Butane and isobutane

C Ethene and ethyne

D Methane and ethane

10. Which salt is used in baking?

A Sodium chloride

B Sodium bicarbonate

C Sodium sulfate

D Potassium nitrate

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