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8.THE D-AND F-BLOCK ELEMENTS (1.)The highest oxidation state exhibited by transition metals is (a.) +7 (b.) +8 (c.) +6 (d.) +5 (2.)Which pair consists only acidic oxides? (a.) CrO3, Mn2O7 (b. ) ZnO2,Al2O3 (c.) CaO, ZnO (d. ) Na2O,Al2O3 (3.)Amongst the following, the lowest degree of paramagnetism per mole of the compound at 298 K will be shown by (a.) MnSO4 .4H2O (b. ) NiSO4 .6H2O (c.) FeSO4 .6H2O (d. ) CuSO4 .5H2O (4.)Zinc does not show variable valency like d-block elements because (a.) It is low melting (b.) d-orbital is complete (c.) It is a soft metal (d.) Two electrons are present in the outermost orbit (5.)The transition elements are more metallic than the representative elements because they have (a.) Electron pairs in d-orbitals (b.) Availability of d-orbitals for bonding (c.) The electron in d-orbitals (d.) Unpaired electron in metallic orbitals (6.)Brass is an alloy of Cu with (a.) Al (b.) Sn (c.) Ag (d.) Zn (7.)Which lanthanoid compound is used as a most powerful liquid lasers after dissolving it in selenium oxychloride? (a.) Cerium oxide (b.) Neodymium oxide (c.) Promethium sulphate (d.) Ceric sulphate (8.)Zn does not show variable valency because of (a.) Complete d-subshell (b.) Inert pair effect (c.) 4s 2 -subshell (d.) None of these (9.)Arrange Ce 3+, La 3+, Pm3+ and Yb 3+ in increasing order of their ionic radii (a.) Yb 3+ < Pm3+ < Ce 3+ < La 3+ (b.) Ce 3+ < Yb 3+ < Pm3+ < La 3+ (c.) Yb 3+ < Pm3+ < La 3+ < Ce 3+ (d.) Pm3+ < La 3+ < Ce 3+ < Yb 3+ (10.)Transition elements are coloured (a.) Due to unpaired d-ellectrons (b.) Due to small size (c.) Due to metallic nature (d.) All of the above (11.)Transition metal with low oxidation number will act as (a.) An oxidizing agent (b.) A base (c.) An acid (d.) None of these (12.)Consider the following statements. (I)La(OH)3 is the least basic among hydroxides of lanthanides (II) Zr4+ and Hf 4+ possess almost the same ionic radii (III) Ce4+ can act as an oxidizing agent Which of the above is/are true? (a.) (I) and (III) (b.) (II) and (III) (c.) (II) only (d.) (I) only (13.)Amongst TiF6 2− , CoF6 3−, Cu2Cl2 and NiCl4 2− (atomic no Ti=22, Co=27, Cu=29,Ni=28) the colourless species are (a.) CoF6 3−and NiCl4 2− (b.) TiF6 2−and CoF6 3−, (c.) Cu2Cl2 and NiCl4 2− (d.) TiF6 2−and Cu2Cl2 (14.)During the extraction of gold the following reactions take place Au + CN− + H2O O2 → [X] [X] + Zn ⟶ [Y] + Au X and Y are respectively (a.) [Au(CN)2 ] −and [Zn(CN)6 ] 4− (b. ) [Au(CN)4 ] 2−and [Zn(CN)4 ] 2− (c.) [Au(CN)4 ] 3−and [Zn(CN)4 ] 2− (d. ) [Au(CN)2 ] −and [Zn(CN)4 ] 2− (15.)Which of the following are d-block elements but not regarded as transition elements? (a.) Cu, Ag, Au (b.) Zn, Cd, Hg (c.) Fe, Co, Ni (d.) Ru, Rh, Pd (16.)The purest zinc is made by
(a.) Electrolytic refining (b.) Zone refining (c.) The van- Arkel method (d.) The Mond process (17.)Most common oxidation states of Ce (cerium) are (a.) +3, +4 (b.) +2, +3 (c.) +2, +4 (d.) +3, +5 (18.)Which is the chief ore of copper? (a.) Galena (b.) Copper pyrites (c.) Sphalerite (d.) Siderite (19.)The magnetic moment of a transition metal ion is 3.87 BM. The number of unpaired electrons present in it is (a.) 2 (b.) 3 (c.) 4 (d.) 5 (20.)The spin only magnetic moment of Mn4+ ion is nearly (a.) 3 BM (b.) 6 BM (c.) 4 BM (d.) 5 BM (21.)What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid? (a.) Cr3+ and Cr2O7 2−are formed (b. ) Cr2O7 2−and H2O are formed (c.) CrO4 2− is reduced to + 3 state of Cr (d. ) None of the above (22.)Silver containing lead as impurity is purified by (a.) Poling (b.) Cupellation (c.) Lavigation (d.) Distillation (23.)Which of the following is not correct about transition metals? (a.) Their compounds are generally coloured. (b.) They can form ionic or covalent compounds. (c.) Their melting and boiling points are high. (d.) They do not exhibit variable valency. (24.)Extraction for zinc from zinc blende is achieved by (a.) Electrolytic reduction (b.) Roasting followed by reduction with carbon (c.) Roasting followed by reduction with another metal (d.) Roasting followed by self reduction (25.)One of the following metals is obtained by leaching its ore with dilute cyanide solution. Identify it. (a.) Titanium (b.) Vanadium (c.) Silver (d.) Zinc (26.)Which of the following has got incompletely filled f-subshell? (a.) Gadolinium (b.) Lutetium (c.) Lawrencium (d.) Tantalum (27.)Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as (a.) Case hardening (b.) Tempering (c.) Sheradizing (d.) Annealing (28.)Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them? (a.) (n −)d 8 , ns 2 (b. ) (n − 1)d 5 , ns 1 (c.) (n − 1)d 3 , ns 2 (d. ) (n − 1)d 5 , ns 2 (29.)Which of the following is known as lunar caustic when in the fused state? (a.) Silver nitrate (b.) Silver sulphate (c.) Silver chloride (d.) Sodium sulphate (30.)The atomic numbers of vanadium (V), chromium (Cr), manganese(Mn), and iron (Fe) are respectively 23, 24, 25 and 26 . Which one of these may be expected to have the highest second ionisation enthalpy? (a.) V (b.) Cr (c.) Mn (d.) Fe (31.)Across the lanthanide series, the basicity of lanthanide hydroxides (a.) Increases (b.) Decreases (c.) First increases and then decreases (d.) First decreases and then increases (32.)The lanthanide contraction is responsible for the fact that (a.) Zr and Zn have the same oxidation state (b.) Zr and Hf have about the same radius (c.) Zr and Nb have similar oxidation state (d.) Zr and Y have about the same radius
(33.)Verdigris is (a.) Basic lead (b.) Basic copper acetate (c.) Basic lead acetate (d.) None of the above (34.)During the extraction of copper, the impurity (FeS) is removed as slag by mixing the contaminated copper ore with silica and coke. The molecular formula of slag is (a.) FeSiO3 (b. ) Fe2O3 (c.) FeSi (solid) (d. ) FeSi (vapour) (35.)The actinoids showing +7 oxidation state are (a.) U, Np (b.) Pu, Am (c.) Np, Pu (d.) Am, Cm (36.)Among the following the coloured compound is (a.) CuCl (b. ) K3[Cu(CN)4] (c.) CuF2 (d. ) [Cu(CH3CN)4 ]BF4 (37.)In the extraction of Fe from Fe2O3, the reducing agent used is (a.) C (b.) Al (c.) Electrolytic reduction (d.) Cu (38.)Which of the following is obtained when auric chloride reacts with sodium chloride? (a.) Na[AuCl] (b. ) Na[AuCl2] (c.) Na[AuCl3] (d. ) Na[AuCl4] (39.)Hydrometallurgy is based on (a.) Calcination (b.) Roasting (c.) Oxidation (d.) Reduction (40.)The composition of malachite is (a.) CuFeS2 (b. ) CuCO3 (c.) CuCO3. Cu(OH)2 (d. ) Cu(OH)2 (41.)Magnetic moment of manganese in (NH4 )2MnBr2 is (a.) 3.87 BM (b.) 5.91 BM (c.) 4.89 BM (d.) 2.82 BM (42.)Which of the following elements does not belong to the first transition series? (a.) Ag (b.) Fe (c.) Cu (d.) V (43.)Green vitriol is (a.) FeSO4. 7H2O (b. ) ZnSO4. 7H2O (c.) CuSO4. 5H2O (d. ) CaSO4. 1 2 H2O (44.)Which one of the following has strongest metallic bonding? (a.) Fe (b.) Sc (c.) V (d.) Cr (45.)Impurities of Cu and Ag from gold are removed by (a.) Boiling impure gold with dil.H2SO4 (b.) Boiling impure gold with conc.H2SO4 (c.) Electrolytically (d.) Both (b) and (c) (46.)On igniting Fe2O3 at 14000°C, the product obtained is (a.) Fe2O3melt (b.) FeO (c.) Fe2O3 (d.) Metallic iron (47.)Siderite is an ore of (a.) Cu (b.) Al (c.) Ag (d.) Fe (48.)Green vitriol is formed by (a.) FeS2 + H2O + O2 (b. ) FeS2 + H2O + CO2 (c.) FeS2 + CO + CO2 (d. ) FeS2 + CO (49.)CuCl absorbs (a.) CO2 (b.) SO2 (c.) H2SO4 (d.) CO (50.)In blast furnace, iron oxide is reduced by (a.) Hot blast of air (b.) Carbon monoxide (c.) Carbon (d.) Silica (51.)Carbon content of (a.) Steel is in between those of cast iron and wrought iron. (b.) Cast iron is in between those of steel and wrought iron.
(c.) Wrought iron is in between those of steel and cast iron. (d.) Steel is higher than that of pig iron. (52.)The most stable oxidation state of lanthanides is (a.) +2 (b.) +4 (c.) 0 (d.) +3 (53.)In Mac Arthur forrest method, silver is extracted from the solution of Na[Ag(CN)2] by the use of (a.) Fe (b.) Mg (c.) Cu (d.) Zn (54.)One of the product formed when K2Cr2O7 reacts with conc H2SO4 in cold is (a.) CrO3 (b.) Cr2 (SO4 )3 (c.) Cr2O3 (d.) CrO4Cl2 (55.)Formation of coloured ions by transition metals signifies (a.) Absorption of light from UV range (b.) Emission of light (c.) Presence of unpaired electrons in s and p orbitals (d.) Complimentary colours to the absorbed light (56.)Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction? (a.) Cu2I2 formed (b.) Cul2 is formed (c.) Na2S2O3 is oxidised (d.) Evolved I2 is reduced (57.)A red solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is (a.) (NH4 )2Cr2O7 (b. ) HgI2 (c.) HgO (d. ) Pb3O4 (58.)Which of the following is the correct sequence of atomic weights of given elements? (a.) Co > Ni > Fe (b.) Fe > Co > NI (c.) Fe > Ni > Co (d.) Ni > Co > Fe (59.)Lanthanide contraction is due to increase in (a.) Shielding by 4f-electrons (b.) Atomic number (c.) Effective nuclear charge (d.) Size of 4f-orbitals (60.)Two of the constituents of German silver are (a.) Ag + Cu (b.) Ag + Zn (c.) Cu + Zn (d.) Cu + Sn (61.)Calamine is (a.) CaCO3 (b. ) MgCO3 (c.) ZnCO3 (d. ) CaCO3 + CaO (62.)Actinides and lanthanides resemble in (a.) Formation of complexes (b.) Oxidation state (c.) Ionization energy (d.) Electronic configuration (63.)A compound in which a metal ion Mx+(Z=25) has a spin only magnetic moment of √24BM. The number of unpaired electrons in the compound and the oxidation state of the metal ion are respectively. (a.) 4 and 2 (b.) 5 and 3 (c.) 3 and 2 (d.) 4 and 3 (64.)Percentage of gold in Fool’s gold is (a.) Zero (b.) 8 (c.) 16 (d.) 30 (65.)Which of the following is coloured compound? (a.) CuF2 (b. ) CuI (c.) NaCl (d. ) MgCl2 (66.)Which of the following statement is not correct? (a.) La(OH)3 is less basic than Lu(OH)3 (b.) In lanthanide series ionic radius of Ln 3+ ions decrease (c.) Zn, Cd, Hg are colourless and are diamagnetic (d.) Mn shows maximum oxidation state is +7 (67.)The bonds presents in the structure of dichromate ion are (a.) Four equivalent Cr—O bonds only. (b.) Six equivalent Cr —O bonds and one O—O bond. (c.) Six equivalent Cr —O bonds and one Cr—Cr bond. (d.) Six equivalent Cr —O bonds and one Cr—O —Cr bond.