Q&A -Ask Doubts and Get Answers
Questions List of Chapter 3: Metals and Non-metals
- Question 1 - Give an example of a metal which:
- Question 2 - Explain the meanings of malleable and ductile
- Question 3 - Why is sodium kept immersed in kerosene oil?
- Question 4 - Write equations for the reactions of:
- Question 5 - Samples 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 follows:
- Question 6 - Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.
- Question 7 - What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.
- Question 8 - (i)Write the electron dot structures for sodium, oxygen and magnesium. (ii) Show the formation of Na2O and MgO by the transfer of electrons. (iii) What are the ions present in these compounds?
- Question 9 - Why do ionic compounds have high melting points?
- Question 10 - Define the following terms: (i) Mineral (ii) Ore (iii) Gangue
- Question 11 - Name two metals which are found in nature in the free state.
- Question 12 - What chemical process is used for obtaining a metal from its oxide?
- Question 13 - Metallic oxides of zinc, magnesium and copper were heated with the following metals:
- Question 14 - Which metals do not corrode easily?
- Question 15 - What are alloys?
- Question 16 - Which of the following pairs will give displacement reactions?
- Question 17 - Which of the following methods is suitable for preventing an iron frying pan from rusting?
- Question 18 - An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
- Question 19 - Food cans are coated with tin and not with zinc because
- Question 20 - You are given a hammer, a battery, a bulb, wires and a switch. (a) How could you use them to distinguish between samples of metals and non-metals? (b) Assess the usefulness of these tests in distinguishing between metals and non-metals
- Question 21 - What are amphoteric oxides? Give two examples of amphoteric oxides?
- Question 22 - Name two metals which will displace hydrogen from dilute acids and two metals which will not.
- Question 23 - In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
- Question 24 - Pratyush took a 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.
- Question 25 - State two ways to prevent the rusting of iron.
- Question 26 - What type of oxides are formed when non-metals combine with oxygen?
- Question 27 - Give reasons:
- Question 28 - 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.
- Question 29 - Differentiate between metal and non-metal on the basis of their chemical properties.
- Question 30 - 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.
- Question 31 - Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
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