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CAIE A-Level Chemistry AS 10.1 Trends in Group 2 Metals and Compounds Questions

Practise Group 2 reaction equations and trends in reactivity, thermal stability and compound solubility, using decomposition and periodic patterns to predict chemical behaviour.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • write reactions of Group 2 metals and compounds with oxygen, water and dilute acids
  • compare nitrate and carbonate thermal stability and identify the gaseous decomposition products
  • use opposing hydroxide and sulfate solubility trends to identify or predict a Group 2 element

Covered syllabus points

10.1.1—Reactions of the elements with oxygen10.1.2—Reactions of the oxides, hydroxides10.1.3—Thermal decomposition trends10.1.4—Describe, and make predictions10.1.5—Variation in the solubilities

Question 1

[Maximum number: 1]

Which row correctly describes the separate reactions of calcium and strontium with water?

substance reduced

substance oxidised

more vigorous reaction

calcium or strontium

water

calcium + water

calcium or strontium

water

strontium + water

water

calcium or strontium

calcium + water

water

calcium or strontium

strontium + water

Question 2

[Maximum number: 1]

Dolomite is a double carbonate, CaMg(CO3)2\mathrm{CaMg}\left(\mathrm{CO}_{3}\right)_{2}, and can be used instead of calcium carbonate for treating acidic soils.

The three statements all refer to the agricultural use of these carbonates.
1 Dolomite and calcium carbonate are both less soluble than Ca(OH)2\mathrm{Ca}(\mathrm{OH})_{2}.
2 One mole of dolomite has the same neutralising effect as one mole of calcium carbonate.

3 Dolomite and calcium carbonate both increase the pH of acidic soils.
Which statements are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Question 3

[Maximum number: 1]

What is the total volume of gas produced, measured at room conditions, when 0.010 mol of anhydrous magnesium nitrate is completely decomposed by heating?

A

240 cm3240 \mathrm{~cm}^{3}

B

480 cm3480 \mathrm{~cm}^{3}

C

600 cm3600 \mathrm{~cm}^{3}

D

720 cm3720 \mathrm{~cm}^{3}

Question 4

[Maximum number: 1]

Steam is passed over heated magnesium to give compound J and hydrogen.
What is not a property of compound J ?

A

It has an MrM_{r} of 40.3.

B

It is basic.

C

It is a white solid.

D

It is very soluble in water.

Question 5

[Maximum number: 1]

All solubility data in this question is given at the same temperature.
The table gives some data for compounds of calcium and for compounds of X, an unidentified element in Group 2.

Table for Question 5 — CAIE A-Level Chemistry AS

What is the missing data for element X ?

solubility of sulfate /mol/ \mathrm{mol} per 100 g of water

solubility of hydroxide /mol/ \mathrm{mol} per 100 g of water

7.11×10−57.11 \times 10^{-5}

2.00×10−52.00 \times 10^{-5}

7.11×10−57.11 \times 10^{-5}

3.37×10−33.37 \times 10^{-3}

1.83×10−11.83 \times 10^{-1}

2.00×10−52.00 \times 10^{-5}

1.83×10−11.83 \times 10^{-1}

3.37×10−33.37 \times 10^{-3}

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