Senior Secondary (HKDSE) · Chemistry

Periodic trends: oxide acid-base character: Practice Questions

5 multiple-choice questions marked as you go, and 2 written questions with worked solutions. All on Periodic trends: oxide acid-base character.

7 questions14 marksFree, no account

Question 1

1 mark

Which statement accurately describes the acid-base character of phosphorus(V) oxide ($$P_4O_{10}$$)?

Question 2

1 mark

Arrange the following oxides of Period 3 elements in increasing order of basicity:
I. Aluminium oxide ($\text{Al}_2\text{O}_3$)
II. Magnesium oxide ($\text{MgO}$)
III. Sulfur trioxide ($\text{SO}_3$)

Question 3

1 mark

When solid aluminium oxide, $\text{Al}_2\text{O}_3$, is reacted with hot, concentrated aqueous potassium hydroxide, a soluble aluminate salt is formed. If the aluminium species in the resulting solution has a coordination number of 4, which of the following represents the correct ionic equation for the reaction?

Question 4

1 mark

Which of the following oxides is least basic?

Question 5

1 mark

A solid oxide of element X reacts with both dilute hydrochloric acid and concentrated aqueous sodium hydroxide. Element X is located in Period 3 of the Periodic Table. Which of the following could be element X?

Question 6

4 marks

Explain the difference in acid-base character between sulfur dioxide ($SO_2$) and magnesium oxide ($MgO$).

Write your answer out first, then check it against the worked solution.

Question 7

5 marks

By referring to electronegativity and the nature of chemical bonding, explain why there is a trend from basic to acidic character for the oxides of Period 3 elements, using $Na_2O$, $Al_2O_3$, and $SO_2$ to illustrate the transition.

Write your answer out first, then check it against the worked solution.

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