Q1. (i) Predict the reaction, if any, between
(a) Zinc and Silver Nitrate solution,
(b) Magnesium and Iron (II) Chloride solution,
(c) Copper and Magnesium Sulphate solution.
Write the equations, with its physical form symbols, for the reaction.
(ii) A lump of element X can be cut by a knife. During its reaction with water, X floats and melts. What is X? Explain.
Q2. (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,
State one property in each of these alloys, which is different from its main constituents.
Q3. (i) Name the method used to extract metals of high reactivity.
(ii) Name the main ore of mercury. How is mercury obtained from its ore? Give balanced chemical equations.
(iii) Explain what is thermite reaction with the help of balanced equation. How is it used to join railway tracks or cracked machine parts?
Q4. (a) An ore on treatment with dilute hydrochloric acid produces brisk effervescence. What type of ore is this? Write the steps required to obtain metal from the enriched ore.
(b) An ore on heating in air gives sulphur dioxide gas. Name the method in each metallurgical step, that will be required to extract this metal from its ore.
Q5. Give reason for the following :
(a) Ionic compounds have high. melting and boiling points.
(b) Non-metals, in general, do not displace hydrogen from dilute acids.
(c) Hydrogen gas is not evolved, when zinc metal reacts with dil. HNO3
(d) School bells are made up of metals.
(e) Oxides of highly reactive metals cannot be reduced by carbon.
Q6. (i) An ore, on heating in air, give sulphur dioxide gas. Name the method in each metallurgical step, that will be. required to extract this metal from its ore.
(ii) State which of the following reactions will take place or which will not, giving suitable reason for each?
Zn(s)+CuSO4 (aq) → ZnSO4 (aq)+Cu(s)
Fe(s) + ZnSO4 (aq) → FeSO4 (aq) + Zn(s)