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(a) Magnesium liberates ________ gas on reacting with hot boiling water.
(b) The white powder formed when magnesium ribbon burns in oxygen is of ________
(c) Ordinary aluminium strips are not attacked by water because of the presence of a layer of ________ on the surface of aluminium.
(d) A metal having low melting point is ________ but a non-metal having very high melting point is ________
(e) Calcium is a ________ reactive metal than sodium.
Solution||| the one metal which displaces copper from copper sulphate solution is zinc. Zinc displaces copper fro the solution of copper sulphate Solution|||The one metal which do not do so is mercury. As mercury do not displace copper from copper sulphate
(a) What is the nature of oxide A2O3?
(b) What is the nature of oxide BO?
(c) Name one metal like A.
(d) Name one metal like B.
(a) no displacement reaction will take place with the solution of copper sulphate, as gold is less reactive then the copper.
(b) there will not be any reaction between copper and copper sulphate.
(c) copper will be replaced by zinc from the copper sulphate
(i) Two atoms of the same element combine to form a molecule. The bond between them is known as .......... bond.
(ii) Two chlorine atoms combine to form a molecule. The bond between them is known as ..........
(iii) In forming oxygen molecule, .......... electrons are shared by each atom of oxygen.
(iv) In forming N2 molecule, .......... electrons are shared by each atom of nitrogen.
(v) The number of single covalent bonds in C2H2 molecule are ...............
(vi) Melting points and boiling points of ionic compounds are generally ........than those of covalent compounds.
A 2, 8, 1
B 2, 8, 7
C 2, 4
(a) Which of these elements is a metal?
(b) Which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which two elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?
(a) The corrosion of iron is called ................
(b) ................ and ................ are necessary for the rusting of iron.
(c) The process of depositing a thin layer of zinc on iron articles is called................
(d) Tiffin boxes are electroplated with ................ but car bumpers are electroplated with ................ to protect them from rusting.
(e) The corrosion of copper produces a ................ coating of basic copper carbonate on its surface.
(f) Brass is an alloy of copper and ..............
(g) Bronze is an alloy of copper and ..............
(h) The non-metal present in steel is ..............
(i) The alloy in which one of the metals is mercury is called an.............
(j) The electrical conductivity and melting point of an alloy is .............. than that of pure metals.
(k) The rocky material found with ores is called..............
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) State whether element B is a solid, liquid or gas at room temperature.
(e) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common 'device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
(a) What could the solids A and B be?
(b) What are the products C and D most likely to be?
(c) Write the chemical equation for the reaction between A and B leading to the formation of C and D.
(d) What is the special name of such a reaction? State one use of such a reaction.
(e) Name any two types of chemical reactions under which the above reaction can be classified.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
(a) Name the metals X and Y.
(b) Which of the two metals is more reactive: X or Y?
(c) Name one ore or metal X. Also write its chemical formula.
(d) Name one ore of metal Y. Also write its chemical formula.
(e) Name one alloy of metal X and one alloy of metal Y.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
(e) What type of chemical can be used to remove the green layer from metal C and clean it? Why?
(a) Name the metal X.
(b) Name the metal oxide XO2
(c) Which reducing agent can be used to reduce XO2 to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.