OCR AS Chemistry

Topic Questions

ASChemistryOCRTopic Questions3. Periodic Table & Energy3.2 Group 2

3.2 Group 2

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11 mark

Which descriptions are correct for the solubility of magnesium hydroxide and barium hydroxide?

 

Magnesium hydroxide

Barium hydroxide

A

Insoluble

Highly soluble

B

Sparingly soluble

Soluble

C

Soluble

Sparingly soluble

D

Highly soluble

Insoluble

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21 mark

Which equation shows the correct reaction of magnesium with cold water?

  • Mg (s) + H2O (g) → MgO (s) + H2 (g)

  • Mg (s) + H2O (l) → MgO (s) + H2 (g)

  • Mg (s) + H2O (g) → Mg(OH)2 (s) + H2 (g)

  • Mg (s) + 2H2O (l) → Mg(OH)2 (s) + H2 (g)

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31 mark

Which property would you expect the Group 2 metal beryllium to possess?

  • It is a good electrical conductor

  • It does not react with oxygen

  • It forms a covalent compound with fluorine

  • It forms a soluble hydroxide

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41 mark

Which is the correct order for the solubility of the Group 2 sulfates from most soluble to least soluble?

 

Most soluble ---------------------------------------------------- least soluble

A

BaSO4 

SrSO4 

CaSO4 

MgSO4 

B

SrSO4 

BaSO4 

CaSO4 

MgSO4 

C

MgSO4 

SrSO4 

CaSO4 

BaSO4 

D

MgSO4 

CaSO4 

SrSO4 

BaSO4 

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51 mark

Which is the correct ionic equation for the positive test result of barium chloride with the sulfate ion?

  • BaCl2 + H2SO4 → BaSO4 + 2HCl

  • BaCl2 + SO42- → BaSO4 + Cl -

  • Ba2++ SO42- → BaSO4

  • Ba + 2Cl - → BaCl2

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61 mark

The graphs show various properties of the Group 2 elements.

group-2-trend-graphs

Which are the correct labels for the y-axes?

 

Graph A

Graph B

A

atomic number

atomic radius

B

melting point

first ionisation energy

C

atomic radius

atomic number

D

first ionisation energy

melting point 

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71 mark

Which statement is not correct for Group 2 metals?

  • An unpaired electron is present in the s orbital

  • Chemical reactivity increases with increasing atomic number

  • The first ionisation energy decreases with increasing atomic number

  • Atomic radius increases with increasing atomic number

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81 mark

The equation below shows the reaction between calcium and water. 

Ca (s) + H2O (l) → Ca(OH)2 (aq) + H2 (g)

Which of the following statements is correct? 

  • The calcium has been reduced. 

  • The calcium has been oxidised.

  • A redox reaction has not taken place.

  • The hydrogen has been oxidised. 

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91 mark

Which compound is used to treat the symptoms of indigestion?

  • Mg(OH)2

  • MgO

  • Ca(OH)2

  • CaO

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101 mark

Which of these increases going up Group 2?

  • Reactivity with water 

  • First ionisation energy 

  • Number of protons

  • Atomic radius 

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11 mark

Which statement(s) about magnesium is/are correct?

  1. In the reaction with water, the oxidation number of hydrogen decreases.
  2. Magnesium is a stronger oxidising agent than beryllium.
  3. Magnesium hydroxide solution is used in weak acid titrations.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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21 mark

Which statement(s) about ionisation energies is/are correct?

  1. The second ionisation energy of calcium is lower than the second ionisation energy of potassium.
  2. Strontium has a larger atomic radius than magnesium so has a higher first ionisation energy.
  3. Mg3+ (g) + e- → Mg4+ (g) + 2e- represents the third ionisation energy of magnesium.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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31 mark

Which is the correct order of reducing agent ability?

W = 1s22s2

X = 1s22s22p63s1

Y  = 1s22s22p63s2

Z  = 1s22s22p63s23p5

 

Order

A

Z > W > Y > X

B

X > W > Y > Z

C

X > Y > W > Z

D

Z > Y > W > X

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41 mark

Which statement(s) about Group 2 elements and their compounds is/are correct?

  1. The electronegativity of the Group 2 elements decreases from magnesium to barium.
  2. Barium hydroxide has the lowest pH because it is the most soluble.
  3. The strength of the ionic bonds increases from magnesium oxide to calcium oxide.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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51 mark

Which statement(s) about the reactions of Group 2 elements is/are correct?

  1. The reaction between magnesium and sulfuric acid has a higher atom economy than between magnesium and hydrochloric acid.
  2. Increasing the temperature of the reaction between calcium and hydrochloric acid will decrease the yield because the backward endothermic reaction is favoured.
  3. Acidified barium chloride can be used to test for sulfate ions and will produce a white precipitate of chloride ions.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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11 mark

The Group 2 elements react with water, forming a solution and a gas.

Which statement is correct?

  • The reactivity of the elements decreases down Group 2

  • The pH of the solution formed increases down Group 2

  • The reaction is a neutralisation

  • The equation for the reaction of strontium with water is:

       2Sr + 2H2O → 2SrOH + H2

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21 mark

The Group 2 oxides all produce alkaline solutions when added to water.

Which Group 2 oxide produces a saturated solution with the highest pH?

  • SrO(aq)

  • MgO(aq)

  • CaO(aq)

  • BaO(aq)

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31 mark

Some Group 2 compounds can be used to treat acid indigestion or to neutralise acid soils.

Which Group 2 compound would not be suitable for either use?

  • Ca(OH)2

  • BaSO4

  • Mg(OH)2

  • CaCO3

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41 mark

Which statement(s) for Group 2 elements is/are correct?

  1. The 2nd ionisation energy of beryllium is greater than the 2nd ionisation energy of magnesium.
  2. A strontium ion, Sr2+, contains a total of 8 electrons in s orbitals.
  3. The equation for the reaction of strontium with water is 2Sr + 2H2O → 2SrOH + H2

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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5
Sme Calculator1 mark

2.168 g of a Group 2 metal, M, is reacted with an excess of chlorine. The reaction forms 8.501 g of a chloride.

What is metal M?

  • Magnesium

  • Calcium

  • Strontium

  • Barium

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61 mark

Which statement is not correct for Group 2 hydroxides?

  • Ca(OH)2 can be used to neutralise alkaline soils in agriculture

  • Mg(OH)2 is used as indigestion remedy

  • The anion in Ba(OH)2 contains 10 electrons

  • Sr(OH)2 is a product of the reaction of strontium and water

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71 mark

Which statement is not correct?

  • Barium has a lower first ionisation energy than strontium

  • Strontium reacts less violently with water than calcium

  • Calcium has a larger atomic radius than magnesium

  • Magnesium hydroxide is less soluble in water than barium hydroxide

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81 mark

Which row is correct?

  Highest pH when added to water Most reactive halogen
A MgO F2
B MgO I2
C BaO F2
D BaO I2

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91 mark

Which one of the following statements is true as you move down Group 2?

  • The first ionisation energy increases

  • The atomic radius increases

  • The solubility of the Group 2 hydroxides decreases

  • The solubility of the Group 2 sulfates increases

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101 mark

A laboratory technician discovered an unlabelled bottle containing a pure white solid. 

After dissolving the solid in water, tests were completed on the unknown solid and it was identified as barium chloride.

What are the correct observations for the chemical reactions of the barium chloride solution?

 

Added to HCl (aq)

Added to H2SO4 (aq)

A

White precipitate forms

Colourless solution forms

B

White precipitate forms

White precipitate forms

C

White precipitate forms

Colourless solution forms

D

No visible change

White precipitate forms

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