Metal & Metal Reactivity

If a mixture of zinc powder and cobalt (II) oxide is heated, the following reaction occurs:

Zn(s) + CoO(s) → ZnO(s) + Co(s)

Which of the following statements is/are true?

1. Zn is higher in the reactivity series than Co

2. Zn acted as the reducing agent

3. Co is oxidised in the reaction

• 1 only

• 1 and 2 only

• 3 only

• 1,2,3

The limestone used in the Blast furnace during extraction of iron

1. produces carbon dioxide

2. produces carbon monoxide

3. removes silica as slag

• 1, 2, 3

• 1 and 2

• 2 and 3

• 3 only

Three metals X, Y and Z behave as follows: Metal Z reacts with cold water but not metals X and Y. Metal Y will displace metal X from its aqueous solution. Which of the following lists the metals in decreasing order of reactivity?

• Z, Y, X

• Y, X, Z

• Z, X, Y

• X, Y, Z

The method used to extract a metal is dictated by

• The position of the metal in the periodic table

• The position of the metal in the reactivity series

• The melting point of the metal

• The electrical conductivity of the ore of the metal

Which of the following metals is most widely used in the construction of aircrafts?

• Copper

• Steel

• Iron

• Aluminium

Which of the following is a list of metals that are found in nature in the free state?

• Copper, silver, gold

• Copper, gold, iron

• Silver, gold, aluminium

• Silver, copper, aluminium

A solid substance X forms an oxide that neutralises hydrochloric acid and reacts with sodium hydroxide. X is most likely to be:

• Copper

• Iron

• Aluminium

• Carbon

All methods of extraction of metals are:

• Electrolytic processes

• Oxidation processes

• Displacement reactions

• Reduction processes

A metal X lies between magnesium and iron in the reactivity series. Which reaction is X most likely to undergo?

• It reduces magnesium oxide to magnesium on heating

• It liberates hydrogen from dilute hydrochloric acid

• It displaces sodium from an aqueous solution of a sodium salt

• Its oxide decomposes to give the metal on heating

Metals

1. conduct electricity

2. form acidic oxides

3. react by losing electrons

• 1, 2 and 3

• 1 and 3 only

• 2 and 3 only

• 3 only