Chapter 10_Group 2
Authored by WONG Moe
Chemistry
University
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8 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
which of the following physical properties decreases when going down Group 2?
Atomic radius
Number of electron shells
Number of valence electrons
First ionisation energy
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following causes the ionisation energy to decrease when going down Group 2?
(I) Increase in shielding effect
(II) Increase in atomic radius
(III) Increase in nuclear charge
II only
I and II only
II and III only
I, II and III
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
P, Q and R are three elements of Group 2. The following are the properties of these elements.
P does not react with cold water but can reduce steam
Q dissolves rapidly in cold water, producing an alkaline solution
R cannot react with cold water or steam
Which of the following shows the correct order of increasing proton number of the elements?
Q, R, P
R, P, Q
P, Q, R
R, Q, P
Answer explanation
P is magnesium
Q could be calcium, strontium or barium
R is beryllium
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following statements best explains why the Group 2 carbonates becomes increasingly less stable towards heat when going up the group?
The polarisation power of the metal cation towards the carbonate anion increases.
The ionic bond in the carbonate compounds become increasingly weaker.
The metals become increasingly electropositive.
The radius of metal cation decreases.
5.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
When 4.80 g magnesium nitrate sample was heated strongly, the final mass of the residue is 1.00 g. What is the percentage purity of the sample?
[Relative atomic mass: N=14.0; O=16.0; Mg=24.0]
77.1%
81.4%
86.8%
92.5%
Answer explanation
2 Mg(NO3)2 --> 2 MgO + 4NO2 + O2
Mol of MgO (residue)
Mass of Mg(NO3)2
Percentage purity
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When heated, magnesium nitrate decomposes at around 350oC, whereas barium nitrate decomposes at temperature above 590oC.
Which of the following does not explain why magnesium nitrate decomposes at lower temperature than barium nitrate?
Mg2+ has higher charge density
The polarising power of Mg2+ ion is stronger
Magnesium oxide is more stable than barium oxide
Magnesium nitrate has higher lattice energy
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The table shows the lattice energy and hydration enthalpy of three Group 2 sulphates.
Which of the following shows the correct arrangement of the sulphates in order of decreasing solubility?
P, R, Q
Q, P, R
Q, R, P
R, Q, P
Answer explanation
Compounds whose hydration energy is more exothermic than its lattice energy are more soluble in water.
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