Tiêu đề 03. METALS and NON METALS.pdf ✅

03. METALS and NON METALS WORKSHEET 1 (1.) Which of the following alloys contain tin ? (1) Bronze (2) Gun metal (3) German silver (4) Type metal (2.) Which of the following metal can we cut with the knife – (1) Gold (2) Potassium (3) Iron (4) All of these (3.) Copper can be extracted from – (1) Kupfernickel (2) Dolomite (3) Galena (4) Malachite (4.) Assertion : Ca 2H O Ca(OH) H (s l aq g ) + → + 2 2 2 ( ) ( ) ( ) calcium floats over water during the reaction with water Reason: The reaction of calcium with water is less violent. The heat evolved is not sufficient for the hydrogen to catch fire. the bubbles of hydrogen gas formed stick to the surface of the water calcium (1) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion (2) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion (3) Assertion is correct but Reason is incorrect (4) Both Assertion and Reason are incorrect (5.) To protect iron from corrosion and rust, it is coated by: (1) Tin (2) Copper (3) Zinc (4) Mercury (6.) Which does not react with dilute hydrochloric acid? (1) Copper (2) Zinc (3) Iron (4) Mercury (7.) Which of the following are found as sulphide ores? (1) Al Hg Pb F , , , (2) Fe Zn Pb , , (3) Hg Pb Na , , (4) F Ca Cu Mg , , , (8.) The position of some metals in the electrochemical series in decreasing electropositive character is given as: Mg Al Zn Cu Ag     . What will happen if a copper spoon is used to stir a solution of aluminium nitrate? (1) The spoon will get coated with aluminium. (2) An alloy of copper and aluminium is formed. (3) The solution becomes blue. (4) No chemical change will take place. (9.) The process to remove unwanted impurities from the ore is called – (1) purification (2) calcination (3) bassimerisation (4) concentration (10.) Duralium is a mixture of – (1) copper (2) tin (3) aluminium (4) manganese (11.) What is the chemical formula for ‘hydrolith’? (1) MgH2 (2) 2NaH (3) 2KH (4) CaH2 (12.) A mineral is called an ore if (1) Metal present in mineral is precious (2) Metal can be extracted from it (3) Metal can be extracted profitably from it (4) Metal cannot be extracted from it (13.) The state in which NaCl is a bad conductor of electricity is and the state in which NaCl is a good conductor of electricity is (1) solid, vapour (2) vapour, molten (3) molten, solid (4) solid, molten (14.) The most malleable metal is – (1) Sodium (2) Silium (3) Gold (4) Lead
(15.) Which of the following metals are obtained by electrolysis of their chlorides in molten state ? (i) Na (ii) Ca (iii) Fe (iv) Cu (1) (i) and (iv) (2) (iii) and (iv) (3) (i) and (iii) (4) (i) and (ii) (16.) Alumina-thermic process is used for the extraction of metals, whose oxides are (1) Fusible (2) Not easily reduced by carbon (3) Not easily reduced by hydrogen (4) Strongly basic (17.) Which of these is not found in native form? (1) Platinum (2) Gold (3) Iron (4) Mercury (18.) Which of the following cannot be reduced by carbon? (1) PbO (2) SnO2 (3) ZnO (4) MgO (19.) When element M of IA group reacts with water, it gives – (1) MOH + O2 (2) MOH + H2O (3) MOH + H2 (4) MH + H2 (20.) Froth floatation method is used for the concentration of – (1) oxide ores (2) sulphide ores (3) sulphate ores (4) halide ores
WORKSHEET 2 (21.) Cu S 2Cu O 6Cu SO 2 2 2 + → + In which process of metallurgy of copper, above equation is involved ? (1) Roasting (2) Self reduction (3) Refining (4) Purification (22.) Metals in the middle of the activity series are generally present as in nature. (1) carbonates and halides (2) oxides and chlorides (3) sulphides and carbonates (4) all of the above (23.) Fe O 2Al s 2Fe Al O Heat x y 3 2 (s l s ) + → + + ( ) ( ) ( ) What are the values of x and y ? (1) x y = = 2, 3 (2) x y = = 3, 2 (3) x y = = 2, 2 (4) x y = = 3, 3 (24.) Rusting of Iron will be faster in? (1) Ordinary water (2) Distilled water (3) Sea water (4) Iron does not rust in water (25.) Impurity of lead present in silver is removed by (1) Cupellation (2) Electrolytic Refining (3) Distillation (4) Liquation (26.) Which metal is used as a reducing agent in smelting. (1) C (2) Al (3) Zn (4) None of these (27.) Identify the alloys which have copper as one of the elements: Brass, gun metal, German silver, solder, alloy for dental cap (1) Brass, gun metal, German silver (2) Brass, German silver, alloy for dental cap (3) Gun metal, solder (4) Alloy for dental cap (28.) The electronic configurations of three elements X, Y and Z are X - 2, 8; Y - 2, 8, 7 and Z - 2, 8, 2. Which of the following is correct? (1) X is a metal (2) Y is a metal (3) Z is a non-metal (4) Y is a non-metal and Z is a metal (29.) Which among the following is the chief ore of Iron? (1) Hematite (2) Magnetite (3) Iron Pyrite (4) Siderite (30.) The white phosphorus is stored (1) in air (2) under water (3) under kerosene (4) under CS2 (31.) Food cans are coated with tin and not zinc because – (1) Zinc is costlier than tin (2) Zinc has a higher melting point than tin (3) Zinc is more reactive than tin (4) Zinc is less reactive than tin (32.) Which of the following statements is correct– (1) All minerals are ores (2) All ores are minerals (3) Some ores are minerals (4) None is correct (33.) Which of the following methods is not involved in metallurgy of iron ? (1) Calcination (2) Smelting (3) Concentration of ore (4) None of these (34.) Which is the least conductor of heat – (1) Gold (2) Platinum (3) Silver (4) Lead (35.) Which one of the following configurations represents metallic character? (1) 2, 8, 2 (2) 2, 8,4 (3) 2,8,7 (4) 2,8,8
(36.) Sodium is obtained by the electrolysis of – (1) an aqueous solution of sodium chloride (2) an aqueous solution of sodium hydroxide (3) fused sodium chloride (4) fused sodium sulphate (37.) The table below gives information about four substance A B C , , , and D . Substanc e Meltin g point Electrical conductivit y (liquid) Solubilit y A High Poor Soluble in water B High Good Soluble in water C Low Poor Soluble in kerosene D High Good Soluble in kerosene Identify the ionic substance from the above given substances. (1) A (2) B (3) C (4) D (38.) A list of common metals arranged in order of their decreasing reactivity is known as: (1) activity series (2) reactivity series (3) conductivity series (4) both A and B (39.) Assertion: Sodium metal reacts with the oxygen of the air at room temperature to form sodium oxide. Reason: Metal forms an oxide on exposure to air. (1) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. (2) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. (3) Assertion is correct but Reason is incorrect. (4) Both Assertion and Reason are incorrect. (40.) Match the following: Column I Column II A. Fe + Cr + Ni (i) Sodium amalgam B. Cu + Zn (ii) Stainless steel C. Pb + Sn (iii) Solder D. Na + Hg (iv) Brass Select the correct option: (1) A-iii, B-iv, C-ii, D-i (2) A-ii, B-i, C-iv, D-iii (3) A-ii, B-iv, C-iii, D-i (4) A-ii, B-iii, C-A, D-iv