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:
Iron (II) sulphate
Copper (II) sulphate
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.
Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in the figure here.
(a) What will be the action of gas on:
(i) dry litmus paper ?
(ii) moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place.
(a) Platinum, gold and silver are used to make jewellery
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
A man went from door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used ?