Class 10 Science Metals and Non Metals Important questions

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One Marks Questions

  • Give name for a molten metal that catches fire in chlorine gas and gives off white fumes?
  • Which metals do not corrode easily?
  • What are alloys?
  • Give name for a metal that forms two types of oxides and rusts in moisture; write their formulae also
  • Name two metals which can displace hydrogen from dilute HCL.
  • Give name for a metal used in hot water systems
  • Metals replace hydrogen from acid, whereas non-metals do not. Why?
  • Are metals electronegative or electropositive?
  • Give name for a metal used in long distance cables wires
  • Give name for a metal added to gold to harden it
  • Name the metal which occurs below copper in the reactivity series. Also name the metal that lies just above hydrogen in the reactivity series
  • Name a metal used in structural engineering
  • Name a metal used as fuse wire
  • Name a brittle metal, which is used to galvanize iron
  • Name a non-metal which is hard and has high melting point.
  • Name a metal whose chloride and sulphate salts are both insoluble
  • Name a metallic chloride that is soluble in hot water but insoluble in cold water.
  • Arrange the following metals in the decreasing order of chemical reactivity; placing the most active first. Cu, Mg, Fe, Na, Ca, Zn.
  • Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
  • Mention one physical property each of a metal and a non metal which is exceptional to their general properties.

Two Marks Questions

  • A copper plate was dipped in AgNO3 solution. After certain time silver from the solution was deposited on the copper plate. State the reason why it happened. Give the chemical equation of the reaction involved.
  • An element X on reacting with oxygen forms an oxide X2O. this oxide dissolves in water and turns blue litmus red.
  • Why are the two non- metals, carbon and hydrogen are important chemical reference points with regard to the method of metal extraction and reactivity towards acids.
  • What is the behavior of magnesium when I is heated and steam is passed over it? Represent the equation.
  • A zinc rod was kept in a glass container having CuSO4 solution. On examining, it was found that the blue color of the solution had faded. After few days when the zinc rod was taken out of the solution, a number of small holes were noticed in it. State the reason and give equation of chemical reaction involved.
  • What is gangue and what is concentration?
  • Lemon or tamarind juice are effective in cleaning tarnished copper vessels.

Four Marks Questions

  • What are the three major steps involved in extraction of a metal after its ore is mined?
  • Carbonates and sulphide ores are usually converted into oxide ores, why?
  • Name the types of reduction processes involved in metallurgy with an example for each.
  • An ore gave SO2on heating with oxygen. How will you concentrate this ore?
  • Write differences between metals and non-metals based on physical properties.
  • Show the formation of Na2O and MgO by the transfer of electrons
  • In metallurgy what do the terms gangue, flux, slag stand for? Give examples.
  • (i) In metallurgy, what does the term ‘Roasting’ stand for?
    (ii) Name the by- product formed during roasting and give one of its uses.
  • How does roasting differ from calcinations? Give equations.
  • Why are aluminum containers used to transport nitric acid?
  • How is iron ore reduced in the blast furnace?
  • Why is Al obtained only by electrolytic reduction of Alumina (pure)?
  • Name the two ores of zinc commonly used.
  • Name two common alloys of zinc with their property and uses.

Five Marks Questions

Question 1
In metallurgy, what do the term calcinations stand for? Give example?

Question 2
Name two metals that occur in a free state nature. What is the method of refining them?

Question 3
Draw a neat and well labelled diagram for electrolytic refining of copper

Question 4
Explain the formation of an ionic compound between a metal and a non- metal by transfer of electrons with Mg as the metal and chlorine as the non –metal to illustrate your answer. Give the reaction that occurs.

Question 5
Explain the chemical change that causes corrosion in iron.

Question 6
If an iron nail is left in a filled bottle of boiled water how long will it take to corrode?
Question 7
What is the one of the most important use of zinc?

Question 8
(a) The following reactions are observed to occur:
(i) CuSO4 + Zn -> ZnSO4 + Cu
(ii) 3ZnSO4 + 2Al -> Al2(SO4)3 + 3Zn
(iii) 2AgNO3 + Cu -> Cu(NO3)2 + 2Ag
Arrange Cu, Zn, Al and Ag in decreasing order of their reactivity.
(b) Write one example each of decomposition reaction carried out with the help of:
(i) Electricity (ii) Sunlight.

Question 9
(a) Define reactivity series of metals. Arrange the metals gold, copper, iron, zinc and magnesium in their increasing order in reactivity.
(b) What will you observe when:
(i) Some Zinc pieces are put into copper sulphate solution?
(ii) Some silver pieces are put into green coloured ferrous sulphate solution?

Question 10
Write the names and symbols of two most reactive metals. Explain by drawing electronic structure how any one of them reacts with a halogen. Explain any two physical properties of the compound formed.

Question 11
In the formation of a compound XY2, atom X donates one electron to each Y atom. Show the electron dot structure of X, Y and the formation of XY2. What is the nature of bond in XY2? Write any three properties of compound XY2. The electronic configurations of the elements X and Y are as follows:
X - 2, 8, 2
Y - 2, 7

Question 12
(a) Write electron dot structure for chlorine (atomic no. 17) and calcium (atomic no. 20). Show the formation of calcium chloride by the transfer electrons.
(b) Identify the nature of the above compound and explain three physical properties of such compounds.
Question 13
Explain why a salt which does not conduct electricity in the solid state but becomes a good conductor in molten state?
Question 14
Give reasons why:
(i) Ionic compounds have high melting and boiling points.
(ii) Ionic compounds are soluble in water.
(iii)Ionic compounds are solid and somewhat hard.
(iv)Ionic compounds conduct electricity in molten state.
Question 15
Metals towards the top of the activity series cannot be obtained from their compounds by reducing with carbon. Why?
Question 16
The oxide X2O3 is unaffected by water. Name a method by which metal X can be obtained from its ore. Give one reason as to why have you chosen this method.
Question 17
(i) How is copper obtained from its ore (sulphide ore)? Write balanced chemical equation.
(ii) How is impure copper purified by electrolytic refining? Draw a labeled diagram to illustrate it.
(iii)State your observation when a magnesium ribbon is burnt. Is magnesium oxidized or reduced?
Question 18
An iron grill should be painted frequently.
Question 19
(a) Define the terms 'alloy' and 'amalgam'. Name the alloy used for welding electric wires together. What are its constituents?
(b) Name the constituents of the following alloys:
(i) Brass (ii) Stainless steel (iii) Bronze
Question 20
How can we prevent corrosion?
Question 21
Metals like iron, silver and copper get corroded on exposure to air. Write the chemical name of the substance deposited on their surface respectively with its colour, in each case.
Question 22
(a) Define the term alloy. Write two advantages of making alloys.
(b) A metal 'X' which is used in thermit process, when heated with oxygen gives an oxide 'Y' which is amphoteric in nature. Identify 'X' and 'Y'. Write down the reactions of oxide 'Y' with HCI and NaOH.

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Practice Question

Question 1 Which among the following is not a base?
B) $NH_4OH$
C) $C_2H_5OH$
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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