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1) Lemon or tamarind juice are effective in cleaning tarnished copper vessels.
2) Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
3) Mention one physical property each of a metal and a non – metal which is exceptional to their general properties.
4)(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.
5) (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?
6) 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.
7) 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 – 1, 8, 1 Y – 2, 7
8) (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.
9) Explain why a salt which does not conduct electricity in the solid state but become s a good conductor in molten state?
10) Give reasons why:
(i) Ionic compounds have high melting and boiling points.
(ii) Ionic compounds are soluble in water.
Ionic compounds are solid and somewhat hard.
Ionic compounds conduct electricity in molten state.
11) Metals towards the top of the activity series cannot be obtained from their compounds by reducing with carbon. Why?
12) 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.
13) (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.
14) State your observation when a magnesium ribbon is burnt. Is magnesium oxidized or reduced?
15) An iron grill should be painted frequently.
16) (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
17) How can we prevent corrosion?
18) 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.
19) (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.