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WorksheetsSTPM Inorganic Group 2 elements
Total questions: 5
Worksheet time: 3mins
The carbonate of a Group 2 element (beryllium to barium) in the Periodic Table, MCO3, decomposes on heating. Which of the following explains why the thermal stability of MCO3 increases down Group 2? [2005, Q25]
The radius of M2+ ion increases
The lattice energy of MCO3 decreases
The charge density of M2+ ion decreases
The distance between M2+ and CO32- ions increases.
Strontium is an element in Group 2 of the Periodic Table which is situated between calcium and barium. Which statement is true?
The strontium ion has a higher charge density than the calcium ion
Strontium sulphate is less soluble in water than calcium sulphate.
Strontium carbonate is more difficult to decompose than barium carbonate when heated
Strontium nitrate is more difficult to decompose than barium nitrate when heated
Which statement best explains why the thermal stability of the carbonates of Group 2 metals of the Periodic Table increases going down the group? [2009, Q20]
The polarisation power of the metal ion towards the CO32- ion decreases.
The strength of ionic bond in the metal carbonate increases.
The radius of the metal ion increases.
The electronegativity of the metal decreases.
When aqueous solutions of barium nitrate and sodium sulphate are mixed, a white precipitate of barium sulphate is formed. Which statement explains why barium sulphate is precipitated from the reaction mixture? [2013 U2, Q10]
Its ions are large
It is an ionic compound with covalent character
Its enthalpy of hydration is lower than its lattice energy
It has a high solubility product
Which element has a value of electronegativity closer to aluminium? [2013 U2, Q11]
Beryllium
Magnesium
Strontium
Barium
