ONLY ONE OPTION IS CORRECT Q.1 The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a colourless solid from which hydrogen is released treatment with water. The metal is : (A) Al (B) Ca (C) Cu (D) Zn Q.2 Magnesium has polarising power close to that of (A) Li (B) Na (C) K (D) Cs Q.3 Mortar is a mixture of (A) Ca(OH)2 silica and water (B) CaCO3 and SiO2 (C) CaO and silica (D) CaCO3, SiO2 and water Q.4 Na2CO3 + Fe2O3 A + CO2 what is A in the reaction? (A) NaFeO2 (B) Na3FeO3 (C) Fe3O4 (D) Na2FeO2 Q.5 Ferrous sulphate on heating gives (A) SO2 and SO3 (B) SO2 only (C) SO3 only (D) S only Q.6 In comparison of ferrous salts, ferric salts are (A) more stable (B) less stable (C) equally stable (D) none of these Q.7 Sodium burns in air to give (A) Na2O (B) Na2O2 (C) NaO2 (D) Na3N Q.8 Oxone is (A) CaO (B) N2O (C) Na2O2 (D) NaBO3 Q.9 Which of the following is not an ore of magnesium? (A) carnallite (B) magnesite (C) dolomite (D) gypsum Q.10 At high temperature, nitrogen combines with CaC2 to give (A) calcium cyanide (B) calcium cyanamide (C) calcium carbonate (D) calcium nitride Q.11 When magnesium burns in air, compounds of magnesium formed are magnesium oxide and (A) Mg3N2 (B) MgCO3 (C) Mg(NO3)2 (D) Mg(NO2)2 Q.12 Which of the following is different from other three oxides? (A) MgO (B) SnO (C) ZnO (D) PbO Q.13 When alumina is electrolysed in presence of cryolite, the gas liberated at graphite anode is (A) F2 (B) O2 (C) CF4 (D) F2O Q.14 In Nessler's reagent, the ion present is (A) HgI2— (B) HgI 2— (C) Hg+ (D) Hg2+ Q.15 Chrome yellow is chemically called (A) lead chromate (B) lead sulphate (C) lead iodide (D) basic lead acetate Q.16 Aluminium metalis purified by (A) Hoope's process (B) Hall's process (C) Serpeck's process (D) Baeyer's process Q.17 Which of the following is true for magnesium? (A) It is more electropositive that sodium (B) It is manufactured by electrolysis of aqueous magnesium chloride (C) It is a strong reducing agent. (D) It resembles, in chemical properties, with its diagonally placed element Boron in 13 group of the Periodic Table. Q.18 A piece of magnesium ribbon was heated to redness in a atmosphere of nitrogen and then cooled with water. The gas evolved in (A) Ammonia (B) Hydrogen (C) Nitrogen (D) Oxygen Q.32 High purity copper metal is obtained by (A) carbon reduction (B) hydrogen reduction (C) electrolytic reduction (D) thermite reduction Q.33 Silica is added to roasted copper ores during smelting in order to remove (A) cuprous sulphide (B) ferrous oxide (C) ferrous sulphide (D) cuprous oxide Q.34 Roasting of copper pyrites is done (A) to remove moisture and volatile impurities (B) to oxidise free sulphur (C) to decompose pyrites into Cu2S and FeS (D) for all the above Q.35 In the electrolytic refining of copper, Ag and Au are found (A) on cathode (B) on anode (C) in the anodic mud (D) in the cathodic mud Q.36 In a transition series, as the atomic number increases, paramagnetism (A) Inc