Question 1

Going down group 2 from calcium to barium

  A  

the first ionisation energy of the element increases

  B  

the strength of the metallic bonding increases

  C  

the polarising power of the 2+ ion decreases

  D  

the stability of the nitrate to heat decreases

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Question 2

Group 2 nitrates undergo thermal decomposition according to the following equation.

X(NO3)2 ➔ XO + 2NO2 + 12\frac{1}{2}O2

Which group 2 nitrate requires the highest temperature to bring about its thermal decomposition?

  A  

barium nitrate

  B  

calcium nitrate


  C  

magnesium nitrate


  D  

strontium nitrate

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Question 3

When magnesium nitrate, Mg(NO3)2⸱7H2O, is heated, which three gases are given off?

  A  

dinitrogen oxide, oxygen, water vapour

  B  

hydrogen, nitrogen, oxygen


  C  

hydrogen, nitrogen dioxide, oxygen


  D  

nitrogen dioxide, oxygen, water vapour

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Question 4

When 3.00 g of an anhydrous nitrate of a group 2 metal is decomposed, 1.53 g of gas is produced.

What is the nitrate compound?

  A  

beryllium nitrate


  B  

calcium nitrate


  C  

magnesium nitrate


  D  

strontium nitrate

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Question 5

Z is an anhydrous compound of a group 2 element.

When it is heated, Z undergoes thermal decomposition to produce two different gases. Z has relatively low thermal stability compared to other group 2 compounds containing the same anion as Z.

What is compound Z?

  A  

barium carbonate 

  B  

barium nitrate


  C  

magnesium carbonate


  D  

magnesium nitrate

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Question 6

Magnesium nitrate, Mg(NO3)2, will decompose when heated to give a white solid and a mixture of gases. One of the gases released is an oxide of nitrogen, X.

7.4 g of anhydrous magnesium nitrate is heated until no further reaction takes place.

What mass of X is produced?

  A  

1.5 g

  B  

2.3 g 

  C  

3.0 g 

  D  

4.6 g

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Question 7

When samples of magnesium nitrate, Mg(NO3)2, and calcium nitrate, Ca(NO3)2, are heated

  A  

both compounds decompose to form the corresponding nitrite and oxygen.

  B  

both compounds decompose to form the corresponding oxide, nitrogen dioxide and oxygen.

  C  

magnesium nitrate decomposes to form magnesium nitrite and oxygen whereas calcium nitrate decomposes to form calcium oxide, nitrogen dioxide and oxygen.

  D  

magnesium nitrate decomposes to form magnesium oxide, nitrogen dioxide and oxygen whereas calcium nitrate decomposes to form calcium nitrite and oxygen.

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Question 8

Which of the following compounds has the most polarised anion?

  A  

Na2O

  B  

MgO

  C  

K2O

  D  

CaO

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Question 9

What occurs as group 2 is descended?

  A  

there is a greater attraction between group 2 cations and Cl- ions

  B  

the hydration enthalpies of the group 2 cations become less negative

  C  

the charge density of the group 2 cations increases

  D  

the lattice enthalpies of the sulfates become more negative

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Question 10

Why is calcium carbonate more thermally stable than magnesium carbonate?

  A  

Mg2+ ions distort carbonate ions more than Ca2+ ions do

  B  

the charge density of Mg2+ ions is smaller than Ca2+ ions

  C  

magnesium is less electronegative than calcium

  D  

Mg2+ ions are larger than Ca2+ ions

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Question 11

Mg2+ has a higher charge density than Ca2+.

Which statement is correct?

  A  

MgCO3 is more thermally stable than CaCO3

  B  

the Mg2+ ion has a less exothermic enthalpy change of hydration than that of Ca2+

  C  

the ionic radius of Mg2+ is greater than that of Ca2+

  D  

the lattice enthalpy of MgCl2 is more exothermic than that of CaCl2

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