Which of the following pairs will give displacement reactions?

Which of the following methods is suitable for preventing an iron frying pan from rusting?

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

Name two allotropes of carbon.

Name three common types of ores where metal exists in nature.

Make a distinction between metals and nonmetals with respect to the nature of their oxide.

Which gas is liberated when a metal reacts with an acid? How will you test the presence of this gas?

Name the metal which reacts with a very dilute HNO₃ to evolve hydrogen gas.

Why do silver articles become black after sometime when exposed to air?

Why is sodium kept immersed in kerosene oil?

What are alloys?

What are amphoteric oxides? Give two examples of amphoteric oxides.

A metal is found in liquid state. It is widely used in instrument for measuring blood pressure. In what form does it occur in nature? How can we extract this metal from its ore?

(i) Name an important oxide ore of iron.
(ii) Describe the extraction of iron from those ore under the following heads:
(a) Reduction of the concentrated ore
(b) Diagram of the furnace used
(c) Chemical equations for the reactions involved

What are 'mineral' and 'ore'?

List three properties of sodium in which it differs from the general physical properties of most metals.

Of the three metals X, Y and Z, X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.

(i) Why Sulphuric acid is called the 'king of chemicals'?
(ii) Name the gas evolved when :
      (a) Concentrated Sulphuric acid acts on Sulphur.
      (b) Dilute Sulphuric acid acts on Sodium carbonate.
(iii) State the colour change you would observe on adding concentrated sulphuric acid to :
      (a) Blue Copper sulphate crystals.
      (b) Colourless cane-sugar crystals.