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WorksheetsGroup 2
Total questions: 10
Worksheet time: 19mins
Which reaction shows the strong heating of magnesium nitrate?
Mg(NO3)2 --> Mg(NO2)2 + O2
Mg(NO3)2 -->MgO2 + 2NO2
Mg(NO3)2 --> MgO + N2O + 2O2
2Mg(NO3)2 --> 2MgO + 4NO2 + O2
The table shows the decomposition temperature of the carbonates of Group 2 elements.
Why is BeCO3 unstable thermally?
The electron cloud of the Be2+ ion is polarised by the CO32– ion.
The electron cloud of the CO32– ion is polarised by the Be2+ ion.
Going down Group 2, the size of the cation increases and the polarisation of the anion by the cation becomes greater.
A small cation absorbs energy more efficiently and can be excited to a higher energy level which is unstable.
Magnesium is a Group 2 element. When magnesium carbonate is heated, magnesium oxide is formed and carbon dioxide is liberated.
MgCO3 --> MgO + CO2
Which of the following is true when going down the group?
Lattice energy of carbonates decreases
Lattice energy of oxides decreases
Thermal stabilities of oxide decreases
Lattice energy of carbonates decreases
Lattice energy of oxides decreases
Thermal stabilities of oxide increases
Lattice energy of carbonates increases
Lattice energy of oxides increases
Thermal stabilities of oxide decreases
Lattice energy of carbonates decreases
Lattice energy of oxides increases
Thermal stabilities of oxide decreases
A solution of aluminium nitrate will turn blue litmus paper to red because
the Al3+ ion is hydrolysed
the Al3+ ion has a high charge
all aluminium compounds are acidic
aluminium nitrate is an ionic compound
Beryllium is a Group 2 element. Which of the following is the anomalous properties of beryllium?
Beryllium oxide is amphoteric
Beryllium chloride does not dissolve in water
Beryllium forms a covalent compound with fluorine
Beryllium oxide can form dimer.
Aqueous beryllium chloride has a pH less than 7 because
the charge density of the beryllium ion is high
the beryllium ion undergoes hydrolysis
beryllium chloride undergoes partial dissociation in water
beryllium chloride is a covalent compound
The solubilities of the sulphates of Group 2 metals decrease down the group because
the cation size increases from Mg2+ to Ba2+
the hydration energy of the cations becomes less exothermic from Mg2+ to Ba2+
the sulphates ion very much smaller than these cations.
The carbonates, nitrates and hydroxides of Group 2 elements decompose to their respective oxides when heated. Hence, it can be concluded that
all compounds of Group 2 elements are unstable to heat
Group 2 elements are strong reducing agents
the oxide is energetically more stable than the carbonates, nitrates and hydroxides
the metallic properties of the elements increases down the Group
The nitrates of Group 2 elements are decomposed by heat. Which of these nitrates in Group 2 has the highest thermal stability?
Beryllium nitrate
Magnesium nitrate
Calcium nitrate
Barium nitrate
Barium sulphate, BaSO4 is less soluble than magnesium sulphate, MgSO4. This is because
BaSO4 is covalent whereas MgSO4 is ionic
the lattice energy of BaSO4 is higher than that of MgSO4
the hydration energy of Ba2+ is less than than of Mg2+
the enthalpy of solution of BaSO4 is more exothermic than that of MgSO4
