WorksheetsGroup 2
Total questions: 11
Worksheet time: 6mins
The group 2 elements each have...
2 e- in an outer s-orbital
2 e- each in outer s- and p-orbitals
2 e- in an outer p-orbital
2 e- in an outer d-orbital
Group 2 melting points...
increases down the group as atomic size increases
decreases down the group as atomic size decreases
decreases down the group as atomic size increases
increases down the group as atomic size decreases
Magnesium reacts slowly with cold water as follows...
Mg + H2O → MgO + H2
2Mg + 2H2O → 2MgOH + H2
Mg + 2H2O → MgO2 + 2H2
Mg + 2H2O → Mg(OH)2 + H2
The most insoluble hydroxide in group 2 is...
Ca(OH)2
Ba(OH)2
Sr(OH)2
Mg(OH)2
Which one of these is not a medical use of group 2 compounds...
Barium meal
Scrubbing SO2
Antacid
Radium radiotherapy
Which group 2 ion is used in the standard test for sulphates?
Mg2+
Sr2+
Ca2+
Ba2+
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.
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
