Which row of the table is correct, A, B, C or D? Row Trend in reactivity of elements going down Group 2 Trend in solubility of sulfates going down Group 2 Trend in solubility of hydroxides going down Group 2 A increases decreases increases B decreases decreases increases C increases increases decreases D decreases increases decreases

On moving down a group, new shells are added which leads to an increased distance between the outermost electron and the nucleus and leads to a decrease in ionisation energy, and hence the reactivity increases. Since the hydration enthalpy decreases faster than the lattice enthalpy in the case of Group 2 sulfates, the solubility of Group 2 sulfates decreases while progressing down the group. The solubility of group 2 hydroxides increases in water as we go down the column. This is because of the decrease in the lattice energy of the hydroxide salt as we move down the group. Hence, the correct row is A.

E M B I B E

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Question>Q 3

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AS and A Level

IMPORTANT

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The solubility of group 2 hydroxides is given in the table below. Calculate the mass of calcium hydroxide that will dissolve in $50 g$ of water at $298 K$ .

Group 2 hydroxides Solubility at $298 K$ ( $mol / 100 g$ of water)

$Mg {(OH)}_{2}$ $2.0 \times 10^{- 5}$

$Ca {(OH)}_{2}$ $1.5 \times 10^{- 3}$

$Sr {(OH)}_{2}$ $3.4 \times 10^{- 3}$

$Ba {(OH)}_{2}$ $1.5 \times 10^{- 2}$

Important Questions on Group 2

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AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Questions>Q 4

Write the chemical formula of magnesium carbonate.

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AS and A Level

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Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Questions>Q 4

Discuss with a partner why the formula of magnesium carbonate is not ${Mg}_{2} {CO}_{3}$ .

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AS and A Level

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Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Questions>Q 4

Write a balanced symbol equation for the reaction of barium carbonate with dilute nitric acid.

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AS and A Level

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Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Questions>Q 4

Which one of the three compounds listed will decompose at the lowest temperature?

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AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Questions>Q 4

Which one of the three compounds listed will decompose at the lowest temperature?

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AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Questions>Q 4

Write balanced chemical equation including state symbols, for the thermal decomposition of strontium carbonate.

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AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Questions>Q 4

Write balanced chemical equation including state symbols, for the thermal decomposition of barium nitrate.

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AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>EXAM-STYLE QUESTIONS>Q 1

Which row of the table is correct, A, B, C or D?

Row	Trend in reactivity of elements going down Group 2	Trend in solubility of sulfates going down Group 2	Trend in solubility of hydroxides going down Group 2
A	increases	decreases	increases
B	decreases	decreases	increases
C	increases	increases	decreases
D	decreases	increases	decreases

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Group 2 hydroxides	Solubility at $298 K$ ( $mol / 100 g$ of water)
$Mg {(OH)}_{2}$	$2.0 \times 10^{- 5}$
$Ca {(OH)}_{2}$	$1.5 \times 10^{- 3}$
$Sr {(OH)}_{2}$	$3.4 \times 10^{- 3}$
$Ba {(OH)}_{2}$	$1.5 \times 10^{- 2}$

The solubility of group 2 hydroxides is given in the table below. Calculate the mass of calcium hydroxide that will dissolve in 50 g of water at 298 K. Group 2 hydroxides Solubility at 298 K (mol/100 g of water) Mg(OH)2 2.0×10-5 Ca(OH)2 1.5×10-3 Sr(OH)2 3.4×10-3 Ba(OH)2 1.5×10-2

Important Questions on Group 2

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