Metals & Non-metals - 3 Class 10 Worksheet Science Chapter 3

Q.1. Name one metal and non-metal which exists in liquid state at room temperature? (1 Marks)
Q.2. What are amphoteric oxides? Give an example. Write balanced chemical equations to justify your answer. (1 Marks)
Q.3. State reason for the following : (3 Marks)
(i) Non-metals cannot displace hydrogen from the acids.
(ii) Hydrogen is not a metal, yet it is placed in the activity series of metals.
(iii) Aluminium is more reactive than iron, yet its corrosion is less than that of iron.
Q.4. (a) List in a tabular form any three chemical properties on the basis of which metals and non-metals are differentiated.
(b) State two ways to prevent the rusting of iron.
Q.5. Which of the following metals exist in their native state in nature? (1 Marks)
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)
Q.6. What is a thermite reaction?  (1 Marks)
Q.7. Metal X is found in nature as its sulphide XS. It is used in the galvanisation of iron articles. Identify the metal X. How will you convert this sulphide ore into the metal? Explain with equations. (5 Marks)
Q.8. In a thermite reaction, a compound of iron reacts with a metal.
(a) Name the metal used in this reaction.  (1 Marks)
(b) After completion of this reaction, a metal is obtained in the molten state. Identify the metal. (1 Marks)
(c) Represent this reaction in the form of a balanced chemical equation. (1 Marks)
(d) Mention the most common use of this reaction. (1 Marks)
Q.9. Which method will you use to reduce the following?
(i) Oxides of less reactive metals
(ii) Oxides of moderately reactive metals
(iii) Oxides of highly reactive metals.
Explain by giving a suitable example. (3 Marks)
Q.10. (i) Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores. 
(ii) How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.  (5 Marks)
Q.11. Write balanced equations for the reaction of :
(i) Aluminium when heated in air. Write the name of the product.
(ii) Iron with steam. Name the product obtained.
(iii) Calcium with water. Why does calcium start floating in water?   (3 Marks)
Q.12. You are given samples of three metals: Sodium, magnesium and copper. Suggest any two activities to arrange them in order to their decreasing reactivity.  (3 Marks)
Q.13. State two physical properties of gold which are of extreme use to jewellers.  (1 Marks)
Q.14. Explain how the following metals are obtained from their compounds by reduction process :
(i) Metal X, which is low in reactivity series.
(ii) Metal Y, which is in the middle of reactivity series.
(iii) Metal Z, which is high in the reactivity series. (3 Marks)
Q.15. Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents? (1 Marks)
(a) Brass
(b) Bronze
(c) Amalgam
(d) Steel
Q.16. What happens when ZnCO₃ is heated in the absence of air? Give the relevant equation. (1 Marks)
Q.17.  An electrolytic cell consists of  (1 Marks)
(i) positively charged cathode
(ii) negatively charged anode
(iii) positively charged anode
(iv) negatively charged cathode
(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (ii) and (iv)
Q.18. Why do we apply paint on iron articles? (1 Marks)

You can access the solutions to this worksheet here.