DPP-43 to 44 Physical Chemistry English PC

DAILY PRACTICE PROBLEMS (DPP) Subject : Physical/Inorg.Chemistry Date : DPP No. 43 to 44 Class : XIII Course : DPP No.43 DPP No.1 Total Marks : 41 Max. Time : 41 min. Single choice Objective ('–1' negative marking) Q.1 (3 marks 3 min.) [3, 3] Multiple choice objective ('–1' negative marking) Q.2 (4 marks 4 min.) [4, 4] Assertion and Reason (no negative marking) Q.3 (3 marks 3 min.) [3, 3] Comprehension ('–1' negative marking) Q.4 to Q.9 (3 marks 3 min.) [18, 18] Subjective Questions ('–1' negative marking) Q.10 (4 marks 4 min.) [4, 4] BooSt YoUr PreViouS ConCept Single choice Objective ('–1' negative marking) Q.11 to Q.13 (3 marks 3 min.) [9, 9] 1. Which of the following is incorrect for sodium peroxide ? (1) It reacts with water and acid, giving hydrogen peroxide. (2) It is pale yellow in colour and is used to purify the air in submarine and confined space. (3) It is used in many industries as bleaching (4) It can be prepared by burning the metal in dioxygen at atmospheric pressure. 2. The compound Na2IrCl6 reacts with triphenylphosphine in diethyleneglycol in an atmosphere of CO to give [IrCl(CO)(PPh3)2], known as 'Vaska's compound'. (Atomic number of Ir = 77) Which of the following statements is /are correct? (1) The IUPAC name of the complex is carbonylchloridobis(triphenylphosphine)iridium(I). (2) The hybridisation of the metal ion is sp3 . (3) The magnetic moment (spin only) of the complex is zero. (4) The complex shows geometrical as well as ionization isomerism. 3. S1 : Plaster of paris is a hemihydrate of calcium sulphate obtained by heating the gypsum above 393 K. S2 : Sodium carbonate is used in water softening. S3 : For a good quality cement, the ratio of silica to alumina should be between 2.5 to 4 and the ratio of lime to the total of the oxides of silicon aluminium and iron should be as close as possible to 2 S : The mobilities of the alkali metal ions in aqueous solutions are Li+ > Na+ > K+ > Rb+ > Cs+ (1) TTFF (2) TTTT (3) F T T F (4) FFFF Comprehension # 1 Na CO (aq) SO2  (P) Na2CO3  (Q) ElementalS  (R) I2  (S) 2 3  4. Select the correct statement for compound (R). (1) Compound (R) is used as antichlor. (2) Compound (Q) and sodium sulphide give compound (R) with iodine gas. (3) Compound (R) is used in photography. (4) All of these 5. Which of the following statement is false for compound (Q) ? (1) With dil . H2SO4 it produces a colourless irritating gas which turns acidified K2Cr2O7 green. (2) It produces a white precipitate with barium nitrate solution which is insoluble in dilute HCl. (3) It does not decolourises the acidified KMnO4 solution (4) (2) and (3) both 6. Oxidation state of S in all the compounds P to S ( if sulphur atoms more than one then consider the average oxidation state) are respectively. (1) + 4, + 4, + 6, + 5 (2) + 4, + 4, + 2, + 5 (3) + 4, + 4, – 2, + 5 (4) None of these. 2 2 2 Comprehension : (Q.No. 7 to 9) A research-guide instructed his two students to synthesize complex [Co(NH3)5(NO2)]Cl2 They synthesised the complexes with identical molecular formula, molar mass, geometry, conductance and spin, but they differed in colour. Based on the above facts answer the following questions. 7. The difference in colour is due to : (1) optical isomerism (2) geometrical isomerism (3) linkage isomerism (4) nuclear isomerism 8. Which of the ligands can show ambident property ? (1) NO – (2) NH (3) H O (4) CO 2 – 2 3 2 3 9. Complexes synthesized can be : (1) [Co(NH3)5(NO2)]Cl2 (2) [Co(NH3)5(ONO)]Cl2 (3) [Co(NH3)5Cl2]NO2 (4) (1) & (2) both. 10. Write a series of equations to show the stepwise displacement of H O ligands in [Fe(H O) ]3+ by ethylenedi- 2 2 6 amine (en) for which log K1 = 4.44 ; log K2 = 3.41 and log K3 = 2.15. What is overall formation constant for the complex [Fe(en) ]3+ ? BooSt YoUr PreViouS ConCept 11. The number of moles of ferrous oxalate oxidised by one mole of KMnO4 is (1) 5 2 2 (2) 5 3 (3) 5 5 (4) 3 12. How many moles of KMnO4 are needed to oxidised a mixture of 1 mole of each FeSO4 & FeC2O4 in acidic medium ? 4 (1) 5 (2) 5 4 (3) 3 4 5 (4) 3 13. In the reaction Na S O + 4Cl + 5H O  Na SO + H SO + 8HCl the equivalent weight of Na2 S2 O3 will be (1) M/4 (2) M/8 (3) M/1 (4) M/2 (M = molecular weight of Na2S2O3) DPP No.44 DPP No.2 Total Marks : 49 Max. Time : 49 min. Single choice Objective (no negative marking) Q.1 to Q.9 (3 marks 3 min.) [27, 27] Complete the following reactions (no negative marking) Q.10 (9 marks 9 min.) [9, 9] BooSt YoUr PreViouS ConCept Single choice Objective (no negative marking) Q.11 to Q.12 (3 marks 3 min.) [9, 9] Subjective Questisons (no negative marking) Q.13 (4 marks 4 min.) [4, 4] 1. Which of the following has the highest solubility in water ? (1) LiOH (2) KOH (3) CsOH (4) RbOH 2. Identify the correct statement ? (1) Sodium metal can be prepared by the electrolysis of an aqueous solution of NaCl. (2) Sodium metal can be kept under ethyl alcohol. (3) Sodium metal is insoluble in liquid NH3 at low temperature. (4) Elemental sodium is easily oxidised. 3. Which one is used as an air purifier in spacecrafts and submarines ? (1) Anhydrous CaCl2 (2) Potassium superoxide (3) Anhydrous Na2CO3 (4) Slaked lime 4. Which of the following compounds on thermal decomposition yields a basic as well as acidic oxides ? (1) KClO3 (2) NaNO3 (3) K2CO3 (4) MgCO3 5. Which of the following statements are true about the alkali metals ? (1) All alkali-metal salts impart a characteristic colour to the Bunsen flame. (2) The correct order of increasing thermal stability of the carbonates of alkali metals is Li2CO3 < Na2CO3 < K2CO3 < Rb2CO3 < Cs2CO3 . (3) Among the alkali metals, cesium is the most reactive. (4) The reducing character of the alkali metal hydrides follow the order : LiH > NaH > KH > RbH > CsH. (1) (1), (2) and (3) (2) (1), (3) and (4) (3) (2), (3) and (4) (4) (1), (2), (3) and (4) 6. Which of the following compounds is used as a raw material in the manufacture of sodium carbonate ? (1) Sodium chloride (2) Sodium hydrogen carbonate (3) Sodium hydroxide (4) Slaked lime 7. Which of the following reactions of potassium superoxide supply oxygen gas in the breathing equipments used in space and submarines ? (1) reaction of superoxide with nitrogen in the exhaled air (2) reaction of superoxide with moisture in the exhaled air (3) reaction of superoxide with carbon dioxide in the exhaled air (1) (1), (2) and (3) (2) (2) and (3) only (3) (2) only (4) (1) and (2) only 8. Calculate the temperature at which the R.M.S. velocity of sulphur dioxide molecules is the same as that of oxygen at 300 K : (1) 600°C (2) 600 K (3) 300 K (4) 300°C 9. Vander wall’s equation for : (1) high pressure and low temp (i) PV = RT + Pb (2) low pressure (ii) PV = RT – a/V (3) force of attraction is negligible (iii) PV = RT + a/V (3) volume of molecule is negligible (iv) [P – (a/V2)] (V – b) = RT. (1) (1)-(i), (2)-(ii), (3)-(i), (4)-(ii) (2) (1)-(i), (2)-(ii), (3)-(iii), (4)-(iv) (3) (1)-(iv), (2)-(iii), (3)-(ii), (4)-(i) (4) (1)-(iv), (2)-(ii), (3)-(iii). (4)-(i). COMPLETE THE FOLLOWING REACTIONS : 10. (i) Reaction between acidic oxides and NaOH : NaOH + NO2  ; NaOH + SO3  (ii) With hot & conc. NaOH : NaOH + Br2  ; NaOH + F2  (iii) With sulphur : NaOH + S  (iv) With boron : B + NaOH  (v) With silicon : NaOH + Si + H2O  (vi) Reaction with amphoteric oxides : PbO + NaOH  ; PbO2 + NaOH  (vii) Reaction with amphoteric metals (e.g. Al, Pb, Sn, Zn etc.) : NaOH + H2O + Al  (viii) Reaction with salts of Cr, Ni, Fe, Mn, Cu etc., : CrCl3 + NaOH  ; CuCl2 + NaOH  (ix) Reaction with salts of Hg and Ag : HgCl2 + NaOH  ; Hg(OH)2  ; AgNO3 + NaOH  ; AgOH  BooSt YoUr PreViouS ConCept 11. Rate of formation of SO3 in the following reaction 2SO2 + O2  2SO3 is 80 g min–1. Hence rate of disappearance of O2 is : (1) 32 g min-1 (2) 8 g min–1 (3) 20 g min–1 (4) 16 g min–1 12. Statement-1 : Time taken for the completion of 75% of a st order reaction is double than its t½. Statement-2 : Time taken for completion of any fraction of a st order reaction is proportional to the extent of reaction completed. (1) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1. (2) Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1 (3) Statement-1 is True, Statement-2 is False (4) Statement-1 is False, Statement-2 is True 13. For the reaction A  products, the following data is given for a particular run. time (min.) : 0 5 15 35 1 [A] (M–1) : 1 2 4 8 Determine the order of the reaction. ANSWER KEY DPP No.-41 1. 3 2. 1 3. 3 4. 2 5. 4 6. 1,2,3,4 7. 2 8. 2 10. – 226, – 67. 11. 4 12. 3 13. (i) 3 (ii) 6 (iii) 2 DPP No.-42 1. 3 2. 1 3. 4 4. 1 5. 1 6. 1,2,3 7. 1,2,3,4 8. 1,2,3,4 9. 3 10. 4 11. 3

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