Vardaan Learning Institute

Topic: Metals and Non-Metals

Class: 10 (Science) Type: Bonus Practice Paper Max. Marks: 50
Name:
Date:
SECTION A: OBJECTIVE TYPE QUESTIONS (1 Mark Each)
1. Which of the following metals does not react with cold as well as hot water using evolution of hydrogen gas?
  1. Na
  2. Ca
  3. Mg
  4. Fe
2. Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
  1. FeO
  2. $Fe_2O_3$
  3. $Fe_3O_4$
  4. $Fe_2O_3$ and $Fe_3O_4$
3. The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?
  1. X is a metal
  2. Y is a metal
  3. Z is a non-metal
  4. Y is a non-metal and Z is a metal
4. Which of the following properties is not generally exhibited by ionic compounds?
  1. Solubility in water
  2. Electrical conductivity in solid state
  3. High melting and boiling points
  4. Electrical conductivity in molten state
5. Zinc is used to galvanize iron to protect it from rusting because:
  1. Zinc is more reactive than iron
  2. Zinc is cheaper than iron
  3. Zinc has a higher melting point than iron
  4. Zinc is less reactive than iron
6. Generally, non-metals are not lustrous. Which of the following non-metals is lustrous?
  1. Sulphur
  2. Oxygen
  3. Nitrogen
  4. Iodine
7. The ability of metals to be drawn into thin wires is known as:
  1. Ductility
  2. Malleability
  3. Sonority
  4. Conductivity
8. Which of the following pairs will give displacement reaction?
  1. $NaCl$ solution and copper metal
  2. $MgCl_2$ solution and aluminium metal
  3. $FeSO_4$ solution and silver metal
  4. $AgNO_3$ solution and copper metal
9. Food cans are coated with tin and not with zinc because:
  1. Zinc is costlier than tin
  2. Zinc has a higher melting point than tin
  3. Zinc is more reactive than tin
  4. Zinc is less reactive than tin
10. 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:
  1. Calcium
  2. Carbon
  3. Silicon
  4. Iron
Directions (Q11-Q14): In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
11. Assertion (A): Zinc oxide is an amphoteric oxide.
Reason (R): Amphoteric oxides react with both acids and bases to produce salt and water.
12. Assertion (A): Gold and Platinum are found in the native state in nature.
Reason (R): They are highly reactive metals.
13. Assertion (A): Ionic compounds have high melting and boiling points.
Reason (R): A large amount of energy is required to break the strong inter-ionic attraction.
14. Assertion (A): Metals produce basic oxides.
Reason (R): Non-metals produce acidic oxides.
SECTION B: SHORT ANSWER QUESTIONS (3 Marks Each)
15. (i) What is meant by the reactivity series of metals?
(ii) Arrange the following metals in decreasing order of their reactivity: Zinc, Iron, Magnesium, Sodium.
(iii) Why does calcium float when placed in water?
16. Differentiate between Roasting and Calcination with suitable examples.
17. (i) Write the electron-dot structure for sodium and chlorine.
(ii) Show the formation of sodium chloride by the transfer of electrons.
(iii) What are the ions present in this compound?
18. Explain the Thermite Process. Write the chemical equation involved. State one use of this reaction.
19. Give reasons for the following:
(i) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
(ii) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
(iii) Copper is used to make hot water tanks and not steel (an alloy of iron).
20. (i) Name the metal which is liquid at room temperature.
(ii) Name the non-metal which is a good conductor of electricity.
(iii) Explain why sodium is kept immersed in kerosene oil.
SECTION C: LONG ANSWER QUESTIONS (5 Marks Each)
21. (i) Name the method used for refining of impure copper.
(ii) Draw a labelled diagram of the electrolytic cell used for refining copper. (Student to draw diagram).
(iii) What happens at the anode and cathode?
(iv) What is anode mud?
22. (i) What is an alloy? How is it prepared?
(ii) Name the constituents of the following alloys: (a) Brass (b) Bronze (c) Solder.
(iii) Why is an alloy used for making electrical heating devices?
SECTION D: CASE STUDY (4 Marks)
23. Read the following text and answer the questions:
Elements can be classified as metals and non-metals on the basis of their physical and chemical properties. Metals are lustrous, malleable, ductile and are good conductors of heat and electricity. Non-metals do not have these properties. Chemical properties involve reaction with air, water, acids etc.

A student took samples of four metals A, B, C and D and added them to the following solutions one by one. The results were:
- Metal A: No reaction with Iron(II) sulphate.
- Metal B: Displacement with Iron(II) sulphate.
- Metal C: No reaction with Iron(II) sulphate, Displacement with Copper(II) sulphate.
- Metal D: No reaction with Iron(II) sulphate, No reaction with Copper(II) sulphate.

(i) Which is the most reactive metal? (1 Mark)
(ii) Arrange the metals in decreasing order of reactivity. (2 Marks)
(iii) Which metal from A, B, C or D is likely to be Silver? (1 Mark)
24. Read the following text and answer the questions:
Corrosion is a natural process that converts a refined metal into a more chemically-stable form such as oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually a metal) by chemical and/or electrochemical reaction with their environment. Rusting of iron is the most common example of corrosion.

(i) What is the chemical formula of rust? (1 Mark)
(ii) State two methods to prevent rusting of iron. (1 Mark)
(iii) Silver articles become black after some time when exposed to air. Why? Write the chemical name of the black substance formed. (2 Marks)
"All the best!"