Metals and Non-metals

Questions 2Which of the following methods is suitable for preventing an iron frying pan from rusting?Applying greaseApplying paintApplying a coating...

Questions 4Food cans are coated with tin and not zinc becauseZinc is costlier than tinZinc has higher melting point than tinZinc is more reactive...

Questions 5You are given a hammer, a battery, a bulb, wires and switch.(a) How could you use them to distinguish between samples of metals and...

Questions 6What are amphoteric oxides? Give two examples of amphoteric oxides.

Questions 7Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

Questions 8In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?

Questions 9Pratyush took sulphur powder on spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown below :(a)...

Questions 10State two ways to prevent the rusting of iron.

Questions 11What types of oxides are formed when non-metals combine with oxygen?

Questions 12Give reasons :(a) Platinum, gold and silver are used to make jewellery.(b) Sodium, potassium and lithium are stored under oil.(c)...

Questions 13You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective...

Questions 14Differentiate between metal and non-metal on the basis of their chemical properties.

Questions 15A man went door to door posing as a goldsmith. He promised to bring back the glitter of the old and dull ornaments. An unsuspecting lady...

Questions 16Give reasons, why copper is used to make hot water tanks and not steel (an alloy of iron).

Question 3Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as...

Question 1(i) Write the electron-dot structures for sodium, oxygen, and magnesium.(ii) Show the formation of Na2O and MgO by the transfer of...