Class 10 Metals and Non-Metals Previous Years Questions

Previous Years Questions Notes Important Questions

Metals And Non-Metals : Previous Years Questions

1. Metal oxide generally reacts with acids, but few oxides of metals also react with bases, such metallic oxides are :
   1. MgO
   2. ZnO
   3. Al₂O₃
   4. CaO
      a. 1 and 2
      b. 2 and 3
      c. 3 and 4
      d. 1 and 4 [1 mark] [CBSE 2023]
2. Bronze is an alloy of
   a. Copper and Zinc
   b. Aluminium and Tin
   c. Copper, Tin and Zinc
   d. Copper and Tin [1mark] [CBSE 2023]
3. Show the formation of Na₂O by the transfer of electrons. [CBSE 2019] [2 Marks]
4. Show the formation of magnesium oxide by the transfer of electrons. [CBSE 2019] [2 Marks]
5. What are ionic compounds ? Why do ionic compounds not conduct electricity in the solid state? [CBSE 2019] [2 Marks]
6. A reddish brown metal used in electrical wires when powered and heated strongly turns black. When hydrogen is passed over this black substances, it regains its original colour. Based on this information answer the following questions :
   1. Name the metal and the black substance formed.
   2. Write balanced chemical equations for two reactions involved in the above information. [3 marks] [CBSE 2023]
7. Out of three metals P, Q and R, P is less reactive than Q and R is more reactive than P and Q both. Suggest an activity to arrange P, Q and R in order of their decreasing reactivity. [CBSE 2019] [3 Marks]
8. Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore. [CBSE 2019] [3 Marks]
9. On the basis of reactivity metals are grouped into three categories :
   (i) Metals of low reactivity
   (ii) Metals of medium reactivity
   (iii) Metals of high reactivity
   Therefore metals are extracted in pure form form their ores on the basis of their chemical properties.
   Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
   Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
   1. Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
   2. Carbon cannot be used as a reducing agent to obtain aluminium from its oxides ? why ?
   3. Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process. or,
   4. Differentiate between roasting and calcination giving chemical equation for each. [4 marks] [CBSE 2023]
10. Two ores X and Y were taken. On heating these ores it was observed that
    i. ore X gives CO₂ gas, and
    ii. ore Y gives SO₂ gas.
    Write steps to convert these ores into metals, giving chemical equations of the reactions that take place. [CBSE 2020] [5 Marks]
11. .
    i. With the help of a diagram explain the method of refining of copper by electrolysis.
    ii. How are broken railway tracks joined? Give the name of the process and the chemical equation of the reaction involved. [CBSE 2020] [5 Marks]
12. .
    i. What is an amalgam?
    ii. Why is solder used for making electrical fuse?
    iii. What is galvanisation? State its significance.
    iv. In the electrolytic refining of copper, name the anode and cathode used and electrolyte taken in the cell. [CBSE 2020] [5Marks]
13. .
    i. Explain the formation of ionic compound, Al₂O₃ with electron-dot structure.
    (Given atomic number of Al and O are 13 and 8 respectively)
    ii. What happens when (report only observations)
    a. a reactive metal reacts with a dilute mineral acid ?
    b. an amphoteric oxide reacts with sodium hydroxide solution ?
    c. a metal of low reactivity is dropped in the salt solution of a metal high reactivity ?
    d. a metal carbonate is treated with acid ? [CBSE 2020] [5 Marks]
14. .
    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. [CBSE 2018] [5 Marks]