Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute sulphuric acid.

Write equations for the reactions of:

(i) iron with steam

(ii) calcium with water

(iii) potassium with water

Samples of four metals A, B, C and D were taken and added to the solutions given in the following table, one by one. The results obtained are as follows:

Use the above table to answer the following questions about metals A, B, C and D:

(i) Which is the most reactive metal?

(ii) What would you observe when metal B is added to a solution of copper (II) sulphate?

(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.

(i) Write the electron-dot structures for sodium, oxygen and magnesium.

(ii) Show the formation of Na₂0 and MgO by the transfer of electrons.

(iii) What are the ions present in these compounds?