10-minute Quiz : Chapter 48

Given that M is a Group I element, which of the following can be its formula?

• A. MO

• B. M₂O

• C. M₂O₃

• D. MO₂

X is an element in the third period of the Periodic Table. It can form a hard and acidic oxide with oxygen and covalent halides with halogens. Which of the following statements about X is correct?

• A. It is a metal element.
• B. Its oxide is insoluble in water.
• C. Its oxide can react with dilute acids.
• D. Its oxide has a simple molecular structure.

Which of the following oxides has the highest solubility in water?

• A. Sodium oxide
• B. Magnesium oxide
• C. Sulphur dioxide
• D. Dichlorine monoxide

Shown below are the formulae of chlorides of some elements in the third period of the Periodic Table.

MgCl₂　　AlCl₃　　SiCl₄　　PCl₃　　SCl₂

Which of these elements have a larger oxidation number in their oxides than in their chlorides?

• A. Mg, Al, Si, P and S
• B. Al, P and S
• C. Mg and Si
• D. P and S

X is an element in the third period of the Periodic Table. It can be converted to its salt (in aqueous solution) through the steps as shown. Which of the following elements may X be?

• A. Mg
• B. Si
• C. Al
• D. P

X and Y are oxides of elements in the third period of the Periodic Table. If we dissolve one mole of Y in water, the solution formed can be neutralized exactly by the solution formed by dissolving one mole of X in water. What may X and Y be respectively?

• A
• B
• C
• D

Refer to the information about the oxides of four elements in the third period of the Periodic Table as shown. Which of these oxides is/are (an) acidic oxide(s)?

• A. II only
• B. III only
• C. I and III only
• D. II and IV only

A student attempted to prepare dry sulphur dioxide using the experimental set-up as shown. The equation for the reaction involved is:

2HCl(aq) + Na₂SO₃(aq) → 2NaCl(aq) + H₂O(l) + SO₂(g)

However, the student failed. Which of the following changes should the student make to ensure successful preparation?

• A. Using dilute nitric acid instead of dilute hydrochloric acid
• B. Using sodium sulphate solid instead of sodium sulphite solid
• C. Removing Flask P

• D. Removing Flask Q

Which of the following statements concerning phosphorus pentoxide is correct?

• A. Its chemical formula is P₂O₅.
• B. It is insoluble in water but soluble in alkalis.
• C. It has a giant covalent structure.
• D. It reacts with dilute sodium hydroxide solution to form a salt with the chemical formula Na₃PO₄.

Which of the following statements concerning some acid oxides is/are correct?

(1) Phosphoric acid forms when phosphorus pentoxide dissolves in water.

(2) Sulphuric acid forms when sulphur dioxide dissolves in water.

(3) Hydrochloric acid forms when dichlorine monoxide dissolves in water.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only