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Vidyamandir Classes APP | Chemistry 1 Stoichiometry-I & II Advanced Problem Package Stoichiometry-I & II SINGLE CORRECT ANSWER TYPE Each of the following Question has 4 choices A, B, C & D, out of which ONLY ONE Choice is Correct. 1. In the reaction : CrO + H SO Cr (SO ) + H O + O 5 2 4 2 4 3 2 2 How many moles of O2 are liberated by 1 mol of CrO5 in above reaction? (A) 5/2 (B) 5/4 (C) 9/2 (D) 7/4 2. A mixture of Na2C2O4 and KHC2O4.H2C2O4 required equal volumes of 0.2 M KMnO4 and 0.2 M NaOH separately for complete titration. The mole ratio of Na2C2O4 and KHC2O4.H2C2O4 in the mixture is : (A) 2/11 (B) 11/2 (C) 5/2 (D) 7/2 3. Following are given some of the unbalanced redox reactions showing all chemical speices participating during the reactions. Identify the redox reaction in which whole of reducing agent has not converted to one product? (A) Au KCN H O O K[Au(CN) ] KOH 2 2 4 (B) V(OH) Cl FeCl HCl VOCl H O FeCl 4 2 2 2 3 (C) KMnO KOH K MnO O H O 4 2 4 2 2 (D) MnO PbO HNO HMnO Pb(NO ) H O 2 3 4 3 2 2 4. A fluoride of Xenon reacts with excess of hydrogen to give 22.4 ml of Xenon at STP and liberated certain amount of HF, which is trapped in water. This hydrofluoric acid solution requires 60 ml of 0.1 M NaOH to neutralize it completely. The formula of Xenon fluoride will be: (A) XeF2 (B) XeF4 (C) XeF6 (D) XeF8 5. 150 mL of solution of I2 is divided into two unequal parts. 1st part reacts with 15 mL of 0.4 M Hypo solution in acidic medium. 2nd part was added to 100 mL of 0.3 M NaOH solution and residual base required 10 mL of 0.3 M H2SO4 solution for complete neutralization. What was the initial concentration of I2? (A) 0.08 M (B) 0.1 M (C) 0.2 M (D) 0.3 M 6. A sample of HCN yields potassium cyanide when titrated with 100 ml of 1 M KOH. The same HCN sample when titrated against 5 M KMnO4 solution in acidic medium, the products formed are Mn2+, NO3 and CO2. The volume of KMnO4 required would be: (A) 400 ml (B) 120 ml (C) 200 ml (D) 40 ml 7. 1 mol of MnO 2 4 in alkaline aqueous medium disproportionates to : (A) 2 3 mol of MnO4 and 1 3 mol of MnO2 (B) 1 3 mol of MnO4 and 2 3 mol of MnO2 (C) 1 3 mol of Mn2O7 and 2 3 mol of MnO2 (D) 2 3 mol of Mn2O7 and 1 3 mol of MnO2
Vidyamandir Classes APP | Chemistry 2 Stoichiometry-I & II 8. RH2 (ion exchange resin) can replace Ca2+ in hard water in a following way: 2+ RH + Ca RCa 2H 2 . 1 L of hard water after passing through RH2 has pH = 2. Hence, hardness in ppm of Ca2+ is : (A) 200 (B) 100 (C) 50 (D) 125 Paragraph for Questions 9 - 10 Air sample from an industrial area of Delhi, which is heavily polluted by CO2, was collected and analysed. One such sample of 224 L of air measured at STP was passed through 500 mL of 0.1 M KOH solution, where CO2(g) was absorbed completely. 50 mL of the above solution was then treated with excess of BaCl2 solution where all the carbonate was precipitated as BaCO3(s). The solution was filtered off and the filtrate required 30 mL of 0.1 M HCl solution for neutralisation. 9. The ppm strength of CO2 (g) volume by volume (mL of CO2 per 106 mL of air) is (A) 224 (B) 2240 (C) 100 (D) 1000 10. The weight of the precipitate of BaCO3(s) obtained from 50 mL of the above test solution is: (Ba = 137, C = 12, O = 16, Mw(BaCO3) = 197g mol–1 ) (A) 3.94 g (B) 0.394 g (C) 0.197 g (D) 1. 97 g Paragraph for Questions 11 - 13 100 mL solution of ferric alum [Fe2(SO4)3.(NH4)2.SO4. 24H2O](Mw = 964 g/mol–1 ) containing 2.41g of salt was boiled with Fe when following reaction took place: Fe + Fe2(SO4)3 3 FeSO4. The unreacted iron was filtered off and the solution was titrated with M/60 K2Cr2O7 solution in acidic medium. 11. Number of moles of FeSO4 formed when Fe reacts with Fe2(SO4)3 is : (A) 0.0075 (B) 0.005 (C) 0.001 (D) 0.002 12. If instead of Fe, plate of Cu is put in Fe2(SO4)3 then number of moles of FeSO4 formed will be: (A) 0.0075 (B) 0.005 (C) 0.001 (D) 0.002 13. Volume of K2Cr2O7 reacted with FeSO4 is: (A) 25 mL (B) 50 mL (C) 75 mL (D) 100 mL MULTIPLE CORRECT ANSWERS TYPE Each of the following Question has 4 choices A, B, C & D, out of which ONE or MORE Choices may be Correct: 14. A solution containing Cu2+ and C2O 2 4 ions is titrated with 20 mL of M/4 KMnO4 solution in acidic medium. The resulting solution is treated with excess of KI after neutralisation. The evolved I2 is then absorbed is 25 mL of M/10 hypo solution.Which of the following statement(s) is/are correct? (A) The difference in the number of mmol of Cu2+ and C2O 2 4 ions in the solution is 10 mmol (B) The difference in the number of mmol of Cu2+ and C2O 2 4 ions in the solution is 12.5 mmol (C) The equivalent weight of Cu2+ salt in the titration with KI is equal to the atomic weight of Cu2+salt itself (D) nf of KI during reaction with Cu2+ salt is 1 15. 100 mL of M/10 Ca(MnO4)2 in acidic medium can be reduced completely with : (A) 100 mL of 1 M FeSO4 solution. (B) 100 mL 3 of 1 M FeC2O4 solution. (C) 16.6 mL of 1 M K2Cr2O7 solution. (D) 50 mL of 1 M C2O 2 4 solution.
Vidyamandir Classes APP | Chemistry 3 Stoichiometry-I & II 16. Equivalent weight of Na2HPO4 can be : (A) M/2 as base if H+ is taken in excess. (B) M/1 as acid if OH– is taken in excess (C) M/1 as base if reacted with 1 equivalent of H+ (D) Defined only as a base and not as an acid for this salt 17. (x) g of H2O2 requires 100 mL of M/5 KMnO4 in a titration having pOH =1. Which of following statement(s) is(are) correct? (A) The value of x is 1.7 g. (B) The value of x is 0.34 g. (C) MnO4 changes to MnO 2 4 (D) H2O2 changes to O2. 18. 20 mL of 6 M HCl is mixed with 50 mL of 2 M Ba(OH)2 and 30 mL of water is added. Select the correct statement(s): (A) [OH– ]mix = 0.8 M (B) [Cl– ]mix = 1.2 M (C) [Ba2+]mix = 0.2 M (D) 40 mmol of OH– are in excess. 19. A sample of oleum is labelled as 112% . Which of the following statement(s) is(are) correct for this sample? (A) Addition of 9 g of water will leave 1/6 mole of SO3 unreacted in it (B) Addition of 9 g of water will make total mass of H2SO4 as 95.7 grams (C) 53.3 g of H2SO4 is present in sample and rest is unreacted SO3 (D) Addition of 12 g of water would react with 53.3 g of unreacted SO3 20. The hardness of water due to HCO3 is 122 ppm. Select the correct statement(s). (A) The hardness of water in terms of CaCO3 is 200 ppm. (B) The hardness of water in terms of CaCO3 is 100 ppm. (C) The hardness of water in terms of CaCl2 is 222 ppm. (D) The hardness of water in terms of MgCl2 is 95 ppm. 21. One mole of Fe2S3 , 2 moles of H2O and 3 moles of O2 are allowed to react in following way : 2 3 2 2 3 2Fe S (s) + 6H O(l) + 3O (g) 4Fe(OH) (s) 6S(s) Select the corect statement(s). (A) H2O would act as limiting reagent. (B) 1.33 moles of Fe(OH)3 is formed. (C) 6 moles of S is formed. (D) It is a non redox reaction. 22. Half litre each of three samples of H2O2 labelled as 10 volume , 15 volume , 20 volume are mixed and then solution is made 3 litre by addition of water. Select the correct statement(s). (A) Final H2O2 solution would be labelled as 7.5 volume (B) Normality of final H2O2 solution is 1.34 (C) Normality of final H2O2 solution is 1.5 (D) Final H2O2 solution would be labelled as 6.5 volume 23. Consider the following redox reaction : 2 2 KMnO Na S O H Mn SO K 4 2 2 3 4 Which of the following is(are) true regarding the above reaction ? (A) 5 mol 8 of Na S O 2 2 3 is oxidised by 1 mole of KMnO4 (B) Oxidation number of sulphur changes from 4 to 12 (C) Change of medium from acidic to basic will have no effect on the stoichiometry of reaction (D) Change in medium from acidic to basic will change the nature of product 24. Which of the following can be oxidised further with a strong oxidising agent ? (A) SO2 (B) MnO2 (C) Al O2 3 (D) CrO3
Vidyamandir Classes APP | Chemistry 4 Stoichiometry-I & II 25. A O2 n is oxidised to AO3 by KMnO4 solution in acidic medium. If 1.34 mmol of A O2 n requires 32.2 mL of 0.05M acidified KMnO4 solution for complete oxidation, which of the following statement(s) is (are ) correct ? (A) The value of n 2 (B) Empirical formula of oxide of AO (C) 1 mol of A O2 n would require 1 mol of acidified K Cr O 2 2 7 solution (D) 'A' can be metal belonging to Group-II of Periodic Table 26. 1.25g of an acid is completely neutralised by 25 mL of a 2 0.25 M Ba(OH) solution. Which of the following statement(s) is (are) correct ? (A) If the acid is dibasic, its molar mass would be 200 (B) If the acid is monobasic, its molar mass would be 400 (C) 0.50 g of the same acid would neutralize completely 12.5 mL of a 0.40 M NaOH solution (D) 1g of the same acid would neutralize completely 25 mL of a 2 0.40 M Ca(OH) solution 27. 5mmol of SO Cl 2 2 is hydrolysed completely to make a 100 mL solution. Which of the following statements is(are) correct ? (Assume no gases were allowed to escape out of solution) (A) The solution would be 0.05M in H SO 2 4 (B) The solution would be 0.05M in HCl (C) If 10 mL of the stock solution is neutralised by 0.2 M NaOH, 10 mL of this base solution would be required (D) If 10 mL of the solution is titrated with excess of AgNO , 3 1.5mmol of AgCl would be formed MATRIX MATCH TYPE Each of the following question contains statements given in two columns, which have to be matched. Statements in Column 1 are labelled as (A), (B), (C) & (D) whereas statements in Column 2 are labeled as p, q, r, s & t. More than one choice from Column 2 can be matched with Column 1. 28. Given two mixtures: (A) NaOH and Na2CO3 (B) and NaHCO3 and Na2CO3. 100 mL of mixture (A) required ‘a’ and ‘b’mL of 1M HCl in separate titration using phenolphthalein and methyl orange indicators while 100 mL of mixture' (B) required ‘x’ and ‘y’ mL of same HCl solution is separate titration using the same indicators. Column 1 [Mixture component] Column 2 [Milli moles] (P) Na2CO3 in mixture (A) 1. (2a - b) (Q) Na2CO3 in mixture (B) 2. (y–2x) (R) NaOH in mixture (A) 3. x (S) NaHCO3 in mixture (B) 4. (b – a) Codes : P Q R S P Q R S (A) 2 3 4 1 (B) 1 3 2 4 (C) 4 3 1 2 (D) 2 1 3 4