Part III Metals

1 mol of magnesium nitrate contains

• A. 2 mol of cations.

• B. 2 mol of anions.

• C. 3 mol of atoms.

• D. 9 mol of ions.

Which of the following statements concerning anodization is correct?

• A. The strength of the aluminium object is enhanced by anodization.

• B. The whole aluminium object becomes aluminium oxide after anodization.

• C. The shape of the aluminium object can be changed by anodization.

• D. Anodization is a chemical change.

Which of the following solutions will turn blue when a piece of copper is added to it?

• A. Ammonium nitrate solution

• B. Calcium nitrate solution

• C. Iron(II) nitrate solution

• D. Silver nitrate solution

Which of the following compounds has the highest percentage by mass of iron?

(Relative atomic masses: N = 14.0, O = 16.0, S = 32.1, Cl = 35.5, Fe = 55.8)

• A. Iron(II) chloride

• B. Iron(II) sulphate

• C. Iron(III) nitrate

• D. Iron(III) oxide

The diagram shows a set-up used to investigate the effect of nitrogen and air on rusting.

The set-up is left for five days. What happens to the water level in tubes X and Y respectively?

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A certain mass of copper is heated strongly in a crucible. Which of the following graphs represents the change in mass of the content in the crucible over time?

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Copper can be obtained from chalcopyrite, a mineral consisting of CuFeS₂. What is the minimum mass of chalcopyrite required to obtain 1.5 g of copper?

(Relative atomic masses: S = 32.1, Fe = 55.8, Cu = 63.5)

• A. 2.3 g

• B. 3.3 g

• C. 4.3 g

• D. 5.3 g

The table shows the results of heating metals P, Q, R and S.

Which of the four metals is the most reactive?

• A. Metal P

• B. Metal Q

• C. Metal R

• D. Metal S

How many moles of hydrogen will be produced when 4.0 g of calcium reacts completely with water?

(Relative atomic mass: Ca = 40.1)

• A. 0.010 mol

• B. 0.020 mol

• C. 0.10 mol

• D. 0.20 mol

Which of the following iron objects is usually prevented from rusting by electroplating?

• A. Food can

• B. Water bucket

• C. Water tap

• D. Coat hanger