Question

Sample of an ore is heated in a test tube.In the beginning a gas is evolved which

turnswet blue litmus red. On further heating a gas is evolved which makes a glowing

splinter burn brilliantly. A shining greyish metal appears in the test tube.Study the

data and answer the following questions.

i) What are the two gases produced?

ii) What is the possible name of the ore?

iii) Which is the metal produced in the test tube?

Answer 1

Gases are Hydrogen and oxygen

Ore is Iron ore.

Metal is Iron

Answer 2

Hello dear,

● Answers -
i) Gases produced => CO2 & O2
ii) Ore burnt => Calcite (CaCO3)
iii) Metal obtained => Calcium (Ca)


● Explanation -
Calcite is ore of calcium with formula CaCO3.

When calcite is heated in a test tube, calcium oxide is obtained.
CaCO3 --> CaO + CO2

This CO2 gas evolved is acidic in nature, thus changes blue litmus red.

Calcium oxide on heating gives shiny calcium metal.
2CaO --> 2Ca + O2

This O2 evolved helps splinter burn more brilliantly.

Thanks for asking..