Q. Name two metals which will displace hydrogen from dilute acids and two metals which will not.

Q. Differentiate between metals and non-metals on the basis of their chemical properties.

Q. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.

Q. Which of the following pairs will give displacement reactions?

1. $NaCl$ solution and copper metal
2. $Mg{Cl}_2$ solution and aluminium metal
3. $FeS{O}_4$ solution and silver metal
4. $AgN{O}_3$ solution and copper metal.

Q. An element reacts with oxygen to give a compound which is basic in nature. This compound is also soluble in water. The element is likely to be:

1. Sodium
2. Carbon
3. Bromine
4. Iron

Q. 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 above.

Q. What type of oxides are formed when non-metals combine with oxygen?

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

1. Applying grease
2. Applying paint
3. Applying a coating of zinc
4. All of the above

Q. Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

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

Q. A man went 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?

Q. In the electrolytic refining of a metal $M$, what would you take as the anode, the cathode, and the electrolyte?

Q. Give reasons.
(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.

Q. State two ways to prevent the rusting of iron:

Q. You are given a hammer, a battery, a bulb, wires and a switch.