Q. No. 6 In which of the following reactions, there is no change in valency? KClO KClO + KCl SO + H S H O + S BaO + H SO BaSO + H O BaO + O BaO Correc

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1 Q. No. 1 The compound that can work both as an oxidizing as well as a reducing agent is : KnO H O Fe (SO ) K Cr O 7 H O Q. No. Which of the following behaves as both oxidizing and reducing agents? H SO SO H S HNO 1 Oxi +6 S S S 1 Oxi S Q. No. Which of the following is not a redox reaction? CaCO CaO+Co O + H H O 1 Na + H O NaOH + H 1 ncl ncl + Cl Q. No. Which substance serves as reducing agent in the following reaction? H O Ni H + CrO H + Cr O + Ni Cr + 7H O + Ni Reducing agent means oxidizes itself. Ni Ni + O Q. No. Which of the following reactions depicts the oxidising property of SO? SO + H O H SO H S + SO S + H O Cl + SO SO Cl + no + SO + H O SO + N + H +

2 Q. No. 6 In which of the following reactions, there is no change in valency? KClO KClO + KCl SO + H S H O + S BaO + H SO BaSO + H O BaO + O BaO Correct Answer BaO +HSO BaSO +HO This is a double displacement reaction Q. No. 7 Nitric oxide acts as a reducing agent in the reaction NH + O NO + 6H O NO + I + H O N O + H SO NO + H SO N O + H SO NO + H S N O + S + H O NO+I + H O NO +6I +8H I is reduced to I Q. No. 8 The oxidation state of osmium (Os) in OsO is OsO x + () = 0 x = 8 Q. No. 9 Oxidation number of nitrogen in (NH )SO is NH + x + (1) =1 x =

3 Q. No. 10 In which of the following compounds, the oxidation number of iodine is fractional? IF 7 I IF IF I Q. No. 11 The oxidation number of Phosphorus in g P O 7 is : Correct Answer g P O 7 () + x + (1) = 0 x = Q. No. 1 In which of the following compounds, nitrogen has an oxidation state of 1? N O NO NH OH N H Correct Answer x + 1= 0 x = 1 Q. No. 1 In which of the following reactions is there a change in the oxidation number of nitrogen atom? NO N O NH + H O NH + + OH N O + H O HNO None of these NO N O + + NH +H O NH +O + 0 N O +H O HNO + + Q. No. 1 When SO is passed through an acidified solution of potassium dichromate the oxidation of S changes from : + to 0 + to + + to to + Correct Answer

4 SO K Cr O G (SO ) Q. No. 1 Oxidation state of nitrogen is correctly given for Compound and Oxidation state Compound [CO(NH ) Cl]Cl, Oxidation state 0 Compound NH OH, Oxidation state +1 Compound (N H ) SO, Oxidation state + Compound g N, Oxidation state Compound g N, Oxidation state Q. No. 16 The oxidation state of chromium in Cr(CO) 6 is : Q. No. 17 In which of the following pairs, there is greatest difference in the oxidation number of the under lined elements? NO and N O P O and P O 10 N O and NO SO and SO SO and SO Q. No. 18 In which of the compounds does manganese exhibits highest oxidation number? no n O K no nso Correct Answer n +6 Q. No. 19 Which of the following elements has least oxidation number? Ni(CN) Ni(CO) Fe O SF 6 Ni O Q. No. 0 The oxidation number of sulphur is S 8, S F, H respectively are 0, +1 and +, +1 and 0, +1 and +, +1 and

5 S O, S F, Fl S Q. No. 1 A metal ion + loses electrons, its oxidation number will be : e e Q. No. + + For the reaction no + CO + H n CO H O, the correct stoichiometric coefficients of no, CO, and H+ are respectively :,, 16 16,,, 16,, 16, no C O + H n CO H O e + no n no +C O n +10CO e C O CO no +C O +16H n +10CO + 8H O Q. No. In the chemical reaction, KCr O 7 + XHSO + YSO KSO + Cr (SO) + ZH O, X, Y and Z are 1,, 1, 1,,,, 1, K Cr O + XH SO + YSO K SO + Cr (SO ) + ZH O 7 +6 Cr O 6e + 7 Cr + + e SO SO Cr O +SO +H Cr +SO +H O KCrO 7 +SO +HSO KSO +Cr (SO )+HO X = 1, Y =, Z = 1

6 Q. No. For the redox reaction + + no + CO + H n CO HO The correct coefficient of the reactants for the balanced reaction are : no, CO 16 no 16, CO no, CO 16 no, CO 16 no CO + H 16 Q. No. What is the coefficient of oxalate ion in the following reaction? + + no + C O + H n CO H O + + no +C O +16H n +10CO +8H O Q. No. 6 In the equation NO + HO NO + H + ne n stands for 1 + NO +H O NO +H +e Q. No. 7 In the chemical reaction, KCr O 7 + xhso + yso KSO + Cr (SO ) + zho x, y and z are 1,, 1, 1,,,, 1, K Cr O + XH SO + YSO K SO + Cr (SO ) + ZH O 7 +6 Cr O 6e + 7 Cr + + e SO SO Cr O +SO +H Cr +SO +H O 7 K Cr O +SO +H SO K SO +Cr (SO )+H O

7 X = 1, Y =, Z = 1 Q. No. 8 In the conversion NHOH N O, the equivalent weight of NH OH will be : 1 NHOH N O 1 +1 For moles of NHOH e transfer 1mole e EW = Q. No. 9 The mass of oxalic acid crystals (H C O. H O) required to prepare 0 ml of 0. N solution is :. g 6. g 0.6 g 0. g Correct Answer C O CO e 16 EW HCO.H O = = = 6 0ml ofa0.n 10 equivalent 1 equivalent no.of moles v.s 610 = 0.6 g Q. No. 0 is molecular weight of KnO. The equivalent weight of KnO when it is converted into K no is: 7

8 Q. No. 1 The equivalent mass of oxidizing agent in the following reaction is SO + H S S + H O Correct Answer SO H S S S + e O W 6 = EW = = 16 Q. No. In the following reaction : NO + AsS + HO AsO + NO + SO + H the equivalent weight of As S (with molecular weight ) is : 8 8 Total e change = + = 8e Q. No. Equivalent weight of H PO (molecular weight = ) when it disproportionates into PH and H PO is 1 1 EW net = W + =

9 Q. No. Equivalent weight of no in acidic, neutral and basic media are in the ratio of : : 1 : : 1 : 1 : 1 : 1 : : : 1 : :1 Q. No. K CrO oxidises KI in the presence of HCl to I. The equivalent weight of the K CrO is w w w w 6 Correct Answer CrO Er w = Q. No. 6 The equivalent weight nso is half its molecular weight when it is converted to n O no no no nso no no no no = V.f Q. No. 7 In the reaction VO + FeO FeO + V O O is equal to its mol. wt. mol. wt./8 mol. wt./6 None of these Correct Answer VO V O W EW(V O ) = 6

10 Q. No. 8 The eq. wt. of K CrO as an oxidizing agent in acid medium is mol. wt./ mol.wt mol. wt mol. wt 6 Correct Answer Cr Cr W EW = +6 + Q. No. 9 Which of the following is a disproportionation reaction? Cu O + H + Cu + cu + H O CrO + H Cr O + H O 7 CaCO + H Ca + + H O + CO 7 Cr O + O CrO + H O Q. No. 0 In the balanced chemical reaction IO + ai + bh CHO + di A, b, c and d respectively, correspond to, 6,,,, 6,,,, 6, 6,, IO + + I + H H O + I + 1 O IO 10 e I e I I + I +H O+6H IO 10I 6I IO + I a, b 6, c, d

11 Q. No. 1 If equal volumes of 0.1 KnO and 0.1 K Cr O 7 solutions are allowed Fe + to Fe + in acidic medium, then Fe + oxidized will be : ore by KnO ore by K Cr O 7 Equal in both cases Cannot be determined Fe +no + 8H Fe +H O+n Fe +Cr O +1H 6Fe +7H O+n Cr Q. No. Volume V 1 nml of 0.1 K Cr O 7 is needed for complete oxidation of g N H in acidic medium. The volume of 0. KnO needed for same oxidation in acidic medium will be / V 1 / V 1 11 V 1 Can not be determined / V 1 Q. No. In the chemical reaction, KCr O 7 + xhso + yso KSO + Cr (SO ) + zho x, y, and z are 1,, 1, 1,,,, 1, 1,, 1 Q. No. 80 ml of KnO solutions reacts with. g of Na C O 7.H O in acidic medium. The molarity of the KnO solution is No. of Eq of KnO no. of Eq Na C O 7.H O no.of moles = no.moles = 0.0 = 0.1b Q. No. What weight of NaHSO is required to react with 100 ml of solution containing 0. g of NalO, according to the following reaction 0. g. g 1.0 g 10. g IO + HSO I + SO

12 IO + HSO I + SO IO 6e I e HSO SO NaIO +NaHSO I +SO 1eq. of NaIO eg. Of NaHSO 6 no.of moles no.of moles 0. x = x = 0. g Q. No. 6 How many moles of no ion will react with 1 mol of ferrous in acidic medium? 1 Correct Answer Fe +C O F + CO + e + e + + n no no + e FeC O 1FeC O no Q. No. 7 What volume of 0. K Cr O 7 in acidic medium is needed for complete oxidation of 00 ml of 0.6 FeC O solution? 1. ml 1. L 10 ml 800 ml + + CrO +Fe C O Fe + CO + Cr W EW (FeC O ) = W EW (Cr O 7 ) = 6 Eq of FeCO =Eq of Cr O = V 100 ml = V = 1. L

13 Q. No. 8 KI reacts with H SO producing I and H S. The volume of 0. H SO required to produce 0.1 mol of H S is L. L.8 L L 8KI+ H SO KSO + I + HS + HO moles ole of H S = 0.1 mol ole of HSO = 0.1 = V = 0. V =. L 1 moles Q. No. 9 Which of the following statement is correct for a galvanic cell? Reduction occurs at cathode Oxidation occurs at cathode Electrons flow from anode to cathode All the statements are correct All the statements are correct Q. No. 0 Consider the following standard reduction potentials? + Ca + e 0 Ca; E = 76V + Pb + e 0 Pb; E = 0.1V + Cu + e 0 Cu; E = 0.V + Hg + e 0 Hg; E = 0.80V + Pt + e 0 Pt; E = 1.0V Which of the following metals is the strongest REDUCING AGENT? Ca Pb Cu Hg Ca Q. No. 1 Consider the following electrodes potentials : + 0 g + e g; E = 7V + 0 V + e V; E = 1.18V Cu + e Cu ; E = 0.1V Which of the following reactions will proceed spontaneously from left to right? g + V g + V + + g + Cu g + Cu V + Cu V + Cu V + Cu V + Cu + + +

14 + + + V + Cu V + Cu Q. No. The standard reaction potentials at 98 K are given against each of the following half cell reactions : Zn + Zn I. E 0.76 V II. E III. E IV. E Cr + Cr H H Fe + Fe V 0.00 V V Based on the above data, state which of the following is the strongest reducing agent? Zn Cr H Fe Zn Q. No. The correct order of reactivity of K, g, Cu with water according to the electrochemical series is K > g > Zn > Cu g > Zn > Cu > K K > Zn > g > Cu Cu > Zn > g > K K > g > Zn > Cu Q. No. g of H O is present n 110 ml of solution. This solution is called 10 vol solution 0 vol solution vol solution vol solution W N= EW V 00 N = = N of H O =.6 volume strength 00.6 = 10 Vol 11 Q. No. A.0 ml solution of H O liberates. 1.7 g of iodine from an acidified KI solution. The percentage strength of H O is HO KI I meq of H O = N

15 W 1.7 meq of I = 1000 = 1000 =10 meq EW 17 I = W = EW = = 17 N = 10 N = 1N of HO = 1.7% HO N. Q. No. 6 The volume strength of 1. NH O solution is H O H O+O 689.L (at STP) ass of HO in 1.N = EW1..L.g Vol.strangth = = 8. L

STIOCHIOMETRY Single answer type questions: 21. SO -2

STIOCHIOMETRY Single answer type questions: 1. SO - + S - + I (Calculated amount) X + I -1. Then X in this reaction is a) SO - b) IO -1 c) SO - d) IO -1. A certain quantity of Ammonium chloride is boiled