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Class 10 Science Metals and Non Metals Extra Questions




In this page we have Class 10 Science Metals and Non Metals Extra Questions . Hope you like them and do not forget to like , social share and comment at the end of the page.


True and false

  1. The composition of aqua-regia is Conc. HCl: Conc. HNO3 is 3: 1
  2. Metals are electronegative?
  3. Sodium chloride conducts electricity in solid state
  4. Chlorine is a half metal
  5. Cassiterite is not an ore of iron
  6. Electrical wires have a coating of an PVC insulting material
  7. Duralumin is a mixture of Copper and tin?
  8. Sodium Metal that can be easily cut with a knife
  9. The impurities (sand, silt, soil, gravel, etc.) present in the ore are called gangue


Match the column

A.

Column A

Column B

Brass

An alloy of Copper and tin

Bronze

An alloy of copper and zinc

Solder

An alloy of iron and carbon

Steel

An alloy of lead and tin


B.

Column A

Column B (electron dot structure)

Magnesium

2,8,7

Chlorine

2,8,2

Sodium

2,6

Oxygen

2,8,1

Fill in the blanks

  1. The minerals from which metals can be conveniently and profitably extracted are called ______
  2. _______ is the process in which a carbonate ore is heated below melting point in absence of air
  3. ______ is the process in which metal oxides are reduced to molten metal by using carbon
  4. The process of purifying impure metal to obtain pure metal is called ________
  5. _____________ is the eating up of metal by action of air, moisture on their surface
  6. ________ is the homogenous mixture of two or more metals
  7. The elements that exhibit properties of both metals and non – metals are called ____________

Multiple Choice Questions

(1) Which of the following non-metals is a liquid?
(a) Carbon
(b) Sulphur
(c) Phosphorus
(d) Bromine

(2) Which of the following methods is suitable for preventing an iron frying pan from rusting?
(a) Applying grease
(b) Applying paint
(c) Applying a coating of zinc
(d) All of the above.

Long Answer type

Question (1)
Give reasons:
(i) Reactivity of A1 decreases if it is dipped in HNO3
(ii) Carbon cannot reduce the oxides of Na or Mg.
(iii) NaCI is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state.
(iv) Metals like Na, K, Ca and Mg are never found in their free state in nature.
Question 2
Metals replace hydrogen from dilute acids, whereas non-metals do not. Why?

Question 3
What is meant by refining of metals? Describe the electrolytic refining of copper with a neat labeled diagram.
Question 4
An ore on heating in air produces sulphur dioxide. Which process would you suggest for its concentration? Describe briefly any two steps involved in the conversion of this concentrated ore into related metal.
Question 5
Why aluminum oxide is considered an amphoteric oxide?

Question 6
State the property utilize in the following:
(a) Graphite in making electrodes.
(b) Electrical wires are coated with polyvinyl chloride (PVC) or a rubber like material.
(c) Metal alloys are used for making bells and strings of musical instruments.
Question 7
Explain with the help of an activity that metals conduct electricity. Draw a diagram for the same.

Question 8
Name a metal which has very low melting point and a non-metal which has very high melting point.

Question 9
Write one example of each of the following:
(a) Most malleable metal and most ductile metal.
(b) The best conductor of heat and the poorest conductor of heat.
(c) A metal with highest melting point and a metal with lowest melting point.
Question 10
(a) Which metal from the following can displace zinc from zinc sulphate solution?
Lead, copper, magnesium, silver
Write the equation of the chemical reaction involved.
(b) Arrange metals Ca, Al, Cu and Au in decreasing order of reactivity.

Question 11
(a) A substance X, an oxide of a metal, is used extensively in the cement industry. This element is found in our bones also. On treatment with water it forms a solution which turns red litmus blue. Identify X and also write the chemical reaction involved.
(b) Choose a metal from the following metals which reacts only with hot water:
Sodium, magnesium, iron
Mention the products formed during the reaction.
Question 12
Food cans are coated with tin rather than zinc.
Give suitable reason for the following
(a)Shining surface of metals is tarnished after some time.
(b) Sodium and potassium are kept under kerosene oil.
(c) Generally no hydrogen gas is involved when metals react with dilute nitric acid
(d) Some alkali metals can be cut with a knife.
Question 13
How metals can be differentiated from non – metals on the basis of any three chemical properties?
Question 14
(a) Support your answer with chemical equations in each case. What happen when magnesium ribbon is burnt in air? What is the state of the metal oxide in the product formed?
(b) An element A forms two oxides AO and AO2.The oxide AO is neutral whereas the oxide AO2 is acidic in nature. Would you call element A a metal or non – metal?
Question 15
(a) What are the bases which are soluble in water called?
(b) Write any four uses of bases.
Question 16
When a copper wire is left in silver nitrate solution, it is observed that the solution turns bluish green.
(a) Explain the observation.
(b) Write the balanced chemical equation to represent the change taking place.
Question 17
What happens when a piece of:
(a) Aluminium metal is added to dilute hydrochloric acid.
(b) Zinc metal is added to copper sulphate solution.
(c) Silver metal is added to copper sulphate solution.
Also write balanced chemical equation, if the reaction occurs.

Question 18
Write balanced chemical equation for the reaction of:
(a) aluminium when heated in air. Write the name of product.
(b) iron with steam and name the products obtained.
(c) calcium with cold water. Why does calcium start floating in water?

Question 19
Iron displaces copper from copper sulphate solution, zinc displaces iron from iron sulphate solution and copper displaces silver from silver nitrate solution. On the basis of these reactions arrange the four metals involved in order of their reactivity. Give balanced chemical equations in each case.

Question 20
The atomic number of magnesium is 12 and of chlorine is 17. Show the formation of magnesium chloride by the transfer of electrons.
Question 21v
(a) Write the electron – dot structure for calcium and sulphur.
(b) Show the formation of CaS by the transfer of electrons.
(c) Name the ions present in this compound CaS.
(Atomic number of Ca = 20, S = 16)
Question 22
Write balanced chemical equations for the following reactions:
(a) Calcium carbonate on reaction with hydrochloric acid gives calcium chloride, water and carbon dioxide.
(b) Nitrogen reacts with hydrogen under pressure to form ammonia.
(c) Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.

Question 23
Write chemical equations for the following reactions:
(a) A piece of calcium metal is dropped in water.
(b) Steam is passed over red hot iron.
(c) Zinc sulphide is heated in air.

Question 24
Define the terms:
(i) Mineral (ii) Ore (iii) Gangue.
Question 25
What is meant by concentration of an ore? Why is it necessary to concentrate an ore before processing? Name an ore of mercury and copper.
Question 26
Differentiate between the following:
(a) Reaction of magnesium and calcium with water.
(b) Roasting and calcinations processes giving an example of each.
(c) Nature of metal and non – metal oxides with an example.
Question 27
How can sodium be obtained from sodium chloride?
Question 28
(i) Define the term ‘anode mud’. Name the electrode made of pure metal.
(ii) Give the reactions taking place at cathode and at anode during the electrolytic refining of copper.
Question 29
(a) Ores of both zinc and mercury are sulphide ores. Explain the methods used to extract these metals from their ores.
(b) Can we store concentrated solution of sodium hydroxide in a zinc container? Explain.
Question 30
If a strip of aluminium with clean surface is dipped into an aqueous solution of copper sulphate for some time, the surface of the strip becomes brown. State the reason for this. Write balanced chemical equation for the reaction.
Question 31
Which metal is more reactive between copper and iron? How can you prove it?
Question 32
Distinguish between the following:
(a) Electrolytic reduction and electrolytic refining.
(b) Mineral and ore.
(c) Alloys and amalgams.

Question 33
Name two metals which do not corrode easily. Give an example in each of the following case to support that:
(a) Corrosion of some metals is an advantage.
(b) Corrosion of a metal is a serious problem.

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A) NaOH
B) $NH_4OH$
C) $C_2H_5OH$
D) KOH
Question 2 What is the minimum resistance which can be made using five resistors each of 1/2 Ohm?
A) 1/10 Ohm
B) 1/25 ohm
C) 10 ohm
D) 2 ohm
Question 3 Which of the following statement is incorrect? ?
A) For every hormone there is a gene
B) For production of every enzyme there is a gene
C) For every molecule of fat there is a gene
D) For every protein there is a gene






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