Tiêu đề 10.THE S-BLOCK ELEMENTS - Questions.pdf ✅

10.THE S-BLOCK ELEMENTS (1.)Which of the following properties of lithium does not show diagonal relationship with magnesium? (a.) Formation of Li + ion (b.) Formation of Li3N (c.) Solubility of LiHCO3 (d.) Thermal decomposition of Li2CO3 (2.)The decomposition temperature is maximum for (a.) MgCO3 (b.) CaCO3 (c.) BaCO3 (d.) SrCO3 (3.)CaC2 + N2 → A, product A is (a.) CaCN2 (b.) CaCN2 and C (c.) CaCN2 + N2 (d.) None of these (4.)Complex forming tendency is more for (a.) Na + (b.) K + (c.) Li + (d.) Rb + (5.)Which of the following metal carbonates is decomposed on heating? (a.) Na2CO3 (b.) MgCO3 (c.) K2CO3 (d.) Rb2CO3 (6.)Mortar is a mixture of (a.) Cement, sand and water (b.) MgCl2, tar and lime (c.) Lime, Portland cement and water (d.) None of the above (7.)Thomas slag is (a.) CaSiO3 (b.) Ca3 (PO4 )2 (c.) MnSiO3 (d.) CaCO3 (8.)Which is quick lime? (a.) CaCO3 (b.) Ca(OH)2 + H2O (c.) Ca(OH)2 (d.) CaO (9.)Which of the following hydroxides is amphoteric in nature? (a.) Be(OH)2 (b.) Mg(OH)2 (c.) Ca(OH)2 (d.) Ba(OH)2 (10.)Bleaching action of bleaching powder is due to the liberation of (a.) O2 (b.) OCl − (c.) Cl2 (d.) Cl − (11.)Which one of the following order of stability is correct? (a.) MgCO3 > CaCO3 > SrCO3 > BaCO3 (b.) BaCO3 > SrCO3 > CaCO3 > MgCO3 (c.) MgCO3 > BaCO3 > SrCO3 > CaCO3 (d.) CaCO3 > BaCO3 > MgCO3 > SrCO3 (12.)Which one of the following is true? (a.) NaOH is used in the concentration of bauxite ore. (b.) NaOH is a primary standard in volumetric analysis. (c.) Manganous hydroxide is soluble in excess of NaOH solution. (d.) NaOH solution does not react with Cl. (13.)Cement does not contain (a.) Calcium (b.) Aluminium (c.) Sulphur (d.) Iron (14.)The ionic conductances of following cations in a given concentration are in the order (a.) Li + < Na + < K + < Rb + (b.) Li + > Na + > K + > Rb + (c.) Li + < Na + > K + > Rb + (d.) Li + = Na + < K + < Rb + (15.)A compound X on heating gives a colourless gas. This residue is dissolved in water to obtain Y. Excess CO2 is bubbled through aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The X is (a.) CaCO3 (b.) Ca(HCO3 )2 (c.) Na2CO3 (d.) NaHCO3 (16.)Which of the following is an epsom salt? (a.) 2CaSO4 .H2O (b.) MgSO4 . 7H2O (c.) MgSO4 . 2H2O (d.) BaSO4 . 2H2O (17.)The characteristic not related to alkali metal is (a.) High ionisation energy (b.) Their ions are isoelectronic with noble gases (c.) Low melting point (d.) Low electronegativity
(18.)The starting material used in Solvay’s process are (a.) Sodium sulphate (b.) Brine solution (c.) Carnallite (d.) All of these (19.)Which one of the following reactions occur at the anode, in the Castner process of extracting sodium metal? (a.) H2 → 2H + + 2e − (b.) 2Cl− → Cl2 + 2e − (c.) 4OH− → 2H2O + O2 + 4e − (d.) Na+ + e − → Na (20.)Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, H2O2 and O2? (a.) Li2O (b.) Na2O2 (c.) NaO2 (d.) Na2O (21.)One mole of magnesium nitride on the reaction with an excess of water gives (a.) One mole of NH3 (b.) Two moles of NH3 (c.) One mole of HNO3 (d.) Two moles of HNO3 (22.)When KI is added to acidified solution of sodium nitrite then (a.) NO gas is liberated and I2 is set free (b.) N2 gas is liberated and HI is produced (c.) N2O gas is liberated and I2 is set free (d.) N2 gas is liberated and HOI is produced (23.)Barium burns in air to form (a.) Ba2O2 (b.) BaO2 (c.) Ba(OH)2 (d.) BaO (24.)Among the alkali metals caesium is the most reactive because (a.) Its incomplete shell is nearest to the nucleus. (b.) It has a single electrons in the valence shell. (c.) It is the heaviest alkali metal. (d.) The outermost electron is more loosely bound than the outermost electron of the other alkali metals. (25.)The decomposition temperature is maximum for (a.) SrCO3 (b.) CaCO3 (c.) MgCO3 (d.) BaCO3 (26.)The characteristic colours given by calcium, strontium and barium in the flame test are respectively (a.) Brick red, apple green, crimson (b.) Crimson, apple green, brick red (c.) Crimson, brick red, apple green (d.) Brick red, crimson, apple green (27.)Which of the following dissolves in hot conc. NaOH solution? (a.) Fe (b.) Zn (c.) Cu (d.) Ag (28.)Which one of the following electrolytes is used in Down’s process of extracting sodium metal? (a.) NaCl + KCl + KF (b.) NaCl (c.) NaOH + KCl + KF (d.) NaCl + NaOH (29.)Setting of plaster of Paris involves (a.) Oxidation with atmospheric oxygen (b.) Combination with atmospheric CO2 (c.) Dehydration (d.) Hydration to yield another hydrate (30.)Which of the following is weakest base? (a.) Zn(OH)2 (b.) NaOH (c.) Ca(OH)2 (d.) KOH (31.)KO2 is used in space and submarines because it (a.) Absorbs CO2and increases O2 concentration (b.) Absorbs moisture (c.) Absorbs CO2 (d.) Produces ozone (32.)A solid is a compound of group 1 element and it gives a bright red colour in the flame test. The solid is (a.) LiBr (b. ) CsCl (c.) KCl (d. ) NaCl (33.)Thomas slag is (a.) Ca3 (PO4 )2 . 2H2O (b.) Ca3 (PO4 )2 . CaSiO3 (c.) MgSiO3 (d.) CaSiO3 (34.)Beryllium shows diagonal relationship with (a.) Mg (b.) Na (c.) B (d.) Al (35.)Solvay process is used for the manufacture of (a.) NaOH (b.) Na2CO3 (c.) NH3 (d.) NaCl
(36.)Consider the following abbreviations for hydrated alkali ions. X = [Li(H2O)n ] + Y = [K(H2O)n ] + Z = [Cs(H2O)n ] + What is the correct order of size of these hydrated alkali ions? (a.) X > Y > Z (b.) Z > Y > X (c.) X = Y = Z (d.) Z > X > Y (37.)In the hardening stage of plaster of Paris, the compound formed is (a.) CaSO4 (b.) Orthorhombic CaSO4 . 2H2O (c.) CaSO4 .H2O (d.) Monoclinic CaSO4 . 2H2O (38.)Which of the following hydroxides is insoluble in water? (a.) Ba(OH)2 (b.) Ca(OH)2 (c.) Be(OH)2 (d.) Mg(OH)2 (39.)Initial setting of cement is mainly due to (a.) Hydration and gel formation (b.) Dehydration and gel formation (c.) Hydration and hydrolysis (d.) Dehydration and oxidation (40.)Which metal is present in chlorophyll? (a.) Ca (b.) Co (c.) Zn (d.) Mg (41.)Gypsum, CaSO4. 2H2O on heating to about 120°C forms a compound which has the chemical composition represented by (a.) CaSO4.H2O (b.) 2CaSO4. 3H2O (c.) 2CaSO4.H2O (d.) CaSO4 (42.)In the extraction of sodium by Down’s process, cathode and anode are respectively (a.) Copper and nickel (b.) Copper and chromium (c.) Nickel and chromium (d.) Iron and graphite (43.)The ionic conductance is least for (a.) Cs+ (b.) Rb+ (c.) K + (d.) Na+ (44.)Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in (a.) Exhibiting maximum covalency in compounds (b.) Forming polymeric hydrides (c.) Forming covalent halides (d.) Exhibiting amphoteric nature in their oxides (45.)The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is (a.) Ag2S2O3 (b.) Ag2S (c.) Na3 [Ag(S2O3 )2 ] (d.) Ag3 [Na(S2O3 )2 ] (46.)CaCl2 is used as (a.) Disinfectant (b.) Desiccating agent (c.) Medicine (d.) None of these (47.)Which of the following sulphates has the highest solubility? (a.) BeSO4 (b.) MgSO4 (c.) BaSO4 (d.) CaSO4 (48.)A fire of lithium, sodium and potassium can be extinguished by (a.) H2O (b.) Nitrogen (c.) CO2 (d.) Asbestose blanket (49.)One of the elements present in carnallite shows flame colouration. The colour of the flame is (a.) Orange (b.) Green (c.) Yellow (d.) Lilac (50.)Aqueous solution of Na2S2O3 on reaction with Cl2 gives (a.) Na2S4O6 (b.) NaHSO4 (c.) NaCl (d.) NaOH (51.)Mixture of MgCl2and MgO is called (a.) Portland cement (b.) Sorel’s cement (c.) Double salt (d.) None of these (52.)Which one of the following processes is used for manufacture of calcium? (a.) Reduction of CaO with carbon (b.) Reduction of CaO with hydrogen (c.) Electrolysis of a mixture of anhydrous CaCl2 and KCl (d.) Electrolysis of molten Ca(OH)2 (53.)Which of the following carbonates decomposes at lowest temperature?
(a.) MgCO3 (b.) CaCO3 (c.) SrCO3 (d.) BaCO3 (54.)The lightest metal among these is (a.) Li (b.) Mg (c.) Ca (d.) Na (55.)Which of the following exists in polymeric form? (a.) AlCl3 (b.) BeCl2 (c.) B2H6 (d.) SiC (56.)The salts of which alkaline earth metal are used in the form of manure? (a.) Mg (b.) Ca (c.) Ba (d.) Sr (57.)Which one of the following will dissolve in water most readily? (a.) I2 (b.) BaCO3 (c.) KF (d.) PbI2 (58.)Thomas slag is referred to as (a.) Calcium silicate (b.) Calcium phosphate (c.) Barium phosphate (d.) Strontium silicate (59.)Which is most basic in character? (a.) CsOH (b. ) KOH (c.) NaOH (d.) LiOH (60.)Which pair of the following chlorides do not impart colour to the flame? (a.) BeCl2 and SrCl2 (b.) BeCl2 and MgCl2 (c.) CaCl2 and BaCl2 (d.) BaCl2 and SrCl2 (61.)Which one of the following substances is used in the laboratory for a fast drying of neutral gases? (a.) Phosphorus pentoxide (b.) Active charcoal (c.) Anhydrous calcium chloride (d.) Na3PO4 (62.)The solubilities of carbonates decrease down the magnesium group due to decrease in (a.) Lattice energies of solids (b.) Hydration energies of cations (c.) Interionic attraction (d.) Entropy of solution formation (63.)Most powerful reducing agent is (a.) Li (b.) Na (c.) Ca (d.) Mg (64.)Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point? (a.) RbCl (b. ) KCl (c.) NaCl (d.) LiCl (65.)The main product obtained when a solution of sodium carbonate reacts with mercuric chloride is (a.) Hg(OH)2 (b.) HgCO3 .HgO (c.) HgCO3 (d.) HgCO3 .Hg(OH)2 (66.)The most electropositive element in alkali metals, is (a.) Na (b.) K (c.) Rb (d.) Cs (67.)Alkali metals act as (a.) Good dehydrating agent (b.) Good reducing agent (c.) Good oxidising agent (d.) None of these (68.)Na2S2O3 is reduced by I2 to (a.) Na2S (b.) Na2SO4 (c.) NaHSO3 (d.) Na2S4O6 (69.)Bleaching powder is obtained by the interaction of chlorine and (a.) Dry calcium oxide (b.) Dry slaked lime (c.) conc. solution of Ca(OH)2 (d.) dilute solution of Ca(OH)2 (70.)Carnallite is (a.) MgCO3 . CaCO3 (b.) MgSO4 . 7H2O (c.) KAlSi3O8 (d.) KCl . MgCl2 . 6H2O (71.)Select the incorrect statement (a.) Be can form complexes due to its very small size (b.) Mg cannot form complexes (c.) Mg burns in air releasing dazzling light rich in UV rays (d.) CaCl2. 6H2O when mixed with ice gives freezing mixture