Rock and minerals

Which of the following metal oxides CANNOT be reduced to pure metal by heating with carbon?

(1) Sodium oxide

(2) Aluminium oxide

(3) Iron oxide

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following statements about limestone is / are correct?

(1) It gives a brick-red flame in a flame test.

(2) It reacts with dilute sulphuric acid to give a clear solution.

(3) Limestone is mainly calcium carbonate.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following is NOT a property of carbon dioxide?

• It relights a glowing splint.

• It is denser than air.

• It turns lime water milky.

• It is not soluble in water.

Which of the following metas is extracted by heating the ore with carbon?

• Aluminium

• Iron

• Magnesium

• Gold

Which of the following substances can be used to distinguish between oxygen and carbon dioxide?

(1) Limewater

(2) Burning splint

(3) Dry cobalt (II) chloride paper

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following reactions would produce a white precipitate?

(1) Mix an aqueous solution of silver nitrate with sea water

(2) Add calcium carbonate to dilute hydrochloric acid.

(3) Bubble carbon dioxide gas into calcium hydroxide solution.

• (1) only

• (2) only

• (1) and (3) only

• (2) and (3) only

In an experiment, limestone is adde to dilute hydrochloric acid. Which of the following statements about the experiment are correct?

(1) The limestone dissolves,

(2) Effervescence occurs.

(3) The process involves a chemical change.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following metals can exist as free elements in the Earth's crust?

(1) Silver

(2) Gold

(3) Sodium

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Consider the following three forms of calcium carbonate:

(1) chalk

(2) limestone

(3) marble

Which of the following represents the increasing order of their hardness?

• (1) < (2) < (3)

• (1) < (3) < (2)

• (2) < (1) < (3)

• (3) < (2) < (1)

A piece of marble is heated in a Bunsen flame.

Which of the following flame colours would be observed?

• Golden yellow

• Brick red

• Lilac

• Green