11 mark
Which of these compounds does not produce a colour in a flame test, and produces an alkaline gas when warmed with sodium hydroxide solution?
Ca(OH)2
Mg(OH)2
NH4Cl
BeCl2
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Groups 1 & 2 (Edexcel International AS Chemistry): Exam Questions
Exam code: XCH11
44 mins18 questions
21 mark
Which statement about the reactivity of Group 2 elements with water is correct?
Reactivity decreases down the group because ionic radius decreases
Reactivity decreases down the group because nuclear charge increases
Reactivity increases down the group because first ionisation energy decreases
Reactivity is constant down the group because all Group 2 elements form 2+ ions
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31 mark
What is the ionic equation for the reaction between aqueous solutions of barium nitrate and sodium sulfate?
Na+ (aq) + N (aq) → NaNO3 (s)
2Ba+ (aq) + S (aq) → Ba2SO4 (s)
Na2+ (aq) + 2N (aq) → Na(NO3)2 (s)
Ba2+ (aq) + S (aq) → BaSO4 (s)
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41 mark
A flame test is carried out on a barium compound, using a clean nichrome wire and a non-luminous Bunsen flame.
What is the colour of the flame?
apple green
lilac
orange-red
red
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51 mark
Which row describes the trends in properties down Group 2?
Decomposition temperature of the carbonate | First ionisation energy | |
|---|---|---|
A | decreases | decreases |
B | decreases | increases |
C | increases | increases |
D | increases | decreases |
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11 mark
5.00 g of calcium carbonate is heated until it fully decomposes.
CaCO3 (s) → CaO (s) + CO2 (g)
What is the volume of CO2 produced, measured at RTP?
[Mr(CaCO3) = 100.1; Molar volume of a gas at RTP = 24 dm3 mol–1]
1.1 dm3
1.2 dm3
2.4 dm3
120 dm3
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21 mark
Data for some Group 1 and Group 2 cations are shown in the table.
Cation | Ionic radius / nm | Ionic charge |
W | 0.100 | +2 |
X | 0.138 | +1 |
Y | 0.113 | +2 |
Z | 0.149 | +1 |
Which cation would be expected to form the nitrate with the greatest thermal stability?
W
X
Y
Z
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31 mark
Magnesium nitrate decomposes on heating.
2Mg(NO3)2 → 2MgO + 4NO2 + O2
What is the total volume of gas formed at room temperature and pressure (r.t.p.) when 0.005 mol of magnesium nitrate decomposes completely?
[Molar volume of a gas at r.t.p. = 24 000 cm3 mol−1]
600 cm3
300 cm3
240 cm3
120 cm3
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41 mark
4.00 g of an anhydrous Group 2 nitrate is heated until decomposition is complete. The mass of gas given off is 2.63 g.
Which nitrate was heated?
[Ar values: N = 14.0 O = 16.0 Mg = 24.3 Ca = 40.1 Sr = 87.6 Ba = 137.3]
magnesium nitrate
calcium nitrate
strontium nitrate
barium nitrate
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51 mark
X is a Group 2 element.
The hydroxide of X is more soluble in water than calcium hydroxide. The sulfate of X is more soluble in water than barium sulfate.
Which element is X?
magnesium
calcium
strontium
barium
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61 mark
2.168 g of a Group 2 metal, M, reacts completely with excess chlorine. 8.501 g of the chloride, MCl2, is formed.
Which element is M?
[Ar value: Cl = 35.5]
magnesium
calcium
strontium
barium
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71 mark
A mineral is heated to constant mass using a Bunsen burner. A colourless gas is given off that turns limewater milky.
The solid left is cooled, and dilute hydrochloric acid is added. There is vigorous effervescence.
Which of these is the mineral?
aragonite, CaCO3
artinite, MgCO3·Mg(OH)2·3H2O
barytocalcite, BaCO3·CaCO3
dolomite, CaCO3·MgCO3
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11 mark
A technician finds three unlabelled bottles. Each contains a different white solid, and each solid is a Group 2 compound.
Tests are carried out on each solid, or on its aqueous solution if it dissolves in water. The results are shown.
Test | Solid 1 | Solid 2 | Solid 3 |
|---|---|---|---|
add to water | dissolves | does not dissolve | dissolves |
add dilute hydrochloric acid | mixture warms up | effervescence of a gas that turns limewater milky | no visible change |
add aqueous sodium hydroxide | no visible change | no visible change | white precipitate |
add dilute sulfuric acid | white precipitate | effervescence of a gas that turns limewater milky | no visible change |
Which row identifies solids 1, 2 and 3?
Solid 1 | Solid 2 | Solid 3 | |
|---|---|---|---|
A | barium carbonate | strontium hydroxide | magnesium sulfate |
B | magnesium sulfate | barium carbonate | strontium hydroxide |
C | strontium hydroxide | barium carbonate | magnesium sulfate |
D | strontium hydroxide | magnesium sulfate | barium carbonate |
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21 mark
Mohr's salt is a pale green crystalline double salt. It contains two different cations and one type of anion. One of the cations is the iron(II) ion, Fe2+.
The results of tests on an aqueous solution of Mohr's salt are shown.
Test | Result |
|---|---|
add dilute hydrochloric acid | no effervescence |
add dilute hydrochloric acid, then aqueous barium chloride | white precipitate |
add aqueous sodium hydroxide and warm | green precipitate |
Which of these could be the formula of Mohr's salt?
NH4Fe(SO4)2·12H2O
(NH4)2Fe(CO3)2
(NH4)2FeCl4·2H2O
(NH4)2Fe(SO4)2·6H2O
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31 mark
1.00 g samples of four nitrates are heated separately until decomposition is complete.
Which nitrate produces the greatest volume of oxygen? All volumes are measured at the same temperature and pressure.
[Ar values: Li = 6.9 N = 14.0 O = 16.0 Na = 23.0 Mg = 24.3 K = 39.1]
lithium nitrate
magnesium nitrate
potassium nitrate
sodium nitrate
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