We have included all the important questions from Metals and Non Metals similar to that of your chapter 3 science Class 10 notes to help you secure a good score in Class 10 science exam. Question 1 Give an example of a metal which : i is a liquid at room temperature.
Answer: i Mercury ii Sodium iii Silver iv Lead. Question 2 Explain the meanings of malleable and ductile. Answer: Malleable : A metal that can be beaten into thin sheets on hammering is called malleable.
Ductile : A metal which can be drawn into thin wires is called ductile. Question 1 Why is sodium kept immersed in kerosene oil? Answer: Sodium is highly reactive. So it is kept immersed in kerosene oil to prevent its reaction with oxygen, moisture and carbon dioxide of air to prevent accidental fires.
Question 2 Write equations for the reactions of i iron with steam. Question 3 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 :.
Answer: i B is the most reactive metal because it gives displacement reaction with iron II sulphate. Metal A is less reactive because it displaces copper from its salt solution. Metal C is still less reactive because it can displace only silver from its salt solution and metal D is the least reactive because it cannot displace any metal from its salt solution.
Question 4 Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H 2 SO 4. Answer: Hydrogen gas is produced when dilute hydrochloric acid is added to a reactive metal. Question 5 What would you observe when zinc is added to a solution of iron II sulphate? Write the chemical reaction that takes place. Answer: Zinc is more reactive than iron. Therefore, when zinc is added to a solution of iron II sulphate, then the greenish colour of iron II sulphate solution fades gradually due to the formation of colourless zinc sulphate solution and iron metal is deposited on zinc.
Question 1 i Write the electron dot structures for sodium, oxygen and magnesium. Question 2 Why do ionic compounds have high melting points? Answer: The ionic compounds are made up of positive and negative ions. There is a strong force Class 10th Science Chapter 4 Ncert Solutions Co of attraction between the oppositely charged ions, so a lot of heat energy is required to break this force of attraction and melt the ionic compound.
Due to this, ionic compounds have high melting points. Question 1 Define the following terms : i Mineral, ii Ore and iii Gangue. Answer: i Mineral : The natural materials in which the metals or their compounds are found in earth are called minerals.
Question 3 What chemical process is used for obtaining a metal from its oxide. Answer: Reduction process is used for obtaining a metal from its oxide. For example, zinc oxide is reduced to metallic zinc by heating with carbon. Besides carbon, highly reactive metals like sodium, calcium, aluminium etc. These displace metals of low reactivity from their oxides. Question 1 Metallic oxides of zinc, magnesium and copper were heated with the following metals :.
In which cases will you find displacement reactions taking place? Answer: A more reactive metal can displace a less reactive metal from its oxide. But out of zinc, magnesium, and copper metals, magnesium is the most reactive, zinc is less reactive whereas copper is the least reactive metal. Question 3 What are alloys? Answer: An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal.
For example, bronze is an alloy of copper and tin. Metals and Nonmetals Class 10 Question 1. Which of the following pairs will give displacement reactions?
Answer: d AgNO 3 solution and copper metal. Question 2. Which of the following methods is suitable for preventing an iron frying pan from rusting? Answer: c Applying a coating of zinc. Question 3. 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 a calcium b carbon c silicon d iron Answer: a Calcium.
Question 4. Food cans are coated with tin and not with zinc because a zinc is costlier than tin b zinc has a higher melting point than tin c zinc is less reactive than tin d zinc is more reactive than tin. Answer: d Zinc is more reactive than tin. Metals and Non metals Class 10 Question 5. You are given a hammer, a battery, a bulb, wires and a switch. Answer: a Metals can be beaten into thin sheets with a hammer without breaking.
Non-metals cannot be beaten with a hammer to form thin sheets. Non-metals break into pieces when hammered. Metals are malleable, while non-metals are non-melleable.
When metals are connected into circuit using a battery, bulb, wires and switch, current passes through the circuit and the bulb glows. When non-metals like sulphur are connected, the bulb does not light up at all. Metals are good conductors of electricity. Metals are good conductors of electricity so these can be used for electrical cables. Question 6. What are amphoteric oxides? Give two examples of amphoteric oxides? OR Write chemical equations that show aluminium oxide reacts with acid as well as base.
In other words, metal oxides that react wtih both acids and bases to form salt and water are called amphoteric oxides. Aluminium oxide and zinc oxide are amphoteric in nature. Question 7. Name two metals which will displace hydrogen from dilute acids and two metals which will not.
Answer: i Metals above hydrogen in the activity series like sodium and magnesium displace hydrogen from dilute acids. Question 8. In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
Question 9. 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. Answer: i Dry litmus paper � no action. Question State two ways to prevent the rusting of iron. Answer: Ways to prevent rusting of iron are : a By painting b By galvanizing. What type of oxides are formed when non-metals combine with oxygen?
Answer: Non-metals combine with oxygen to form acidic oxides or neutral oxides. Give reasons : a Platinum, gold and silver are used to make jewellery.
Answer: a Platinum, gold and silver are used to make jewellery because these are malleable and ductile. These are highly resistant to corrosion. This is due to their low ignition temperature and high reactivity. This layer prevents aluminium to react with other substances. Since it is easier to obtain metals from their oxides than from their carbonates or sulphides directly, therefore, the carbonate and sulphide ores are first converted to oxides for extracting the metals.
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. Answer: The sour substances such as lemon or tamarind juice contain acids.
These acids dissolve the coating of copper oxide or basic copper carbonate present on the surface of tarnished copper vessels and makes them shining red-brown again. Differentiate between metal and non-metal on the basis of their chemical properties. 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.
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