CHAPTER PRACTICE PROBLEM

Quiz

ADIT91A02 (CHIT)/ADTR,TW & TS91A01 FIITJEE CHENNAI CENTRE

Subject: Chemistry

Topic:

TIME: Min.

NAME:

Quiz

1. Volume in mL of 40 volumes H2O2 that will oxidize 0.2 mol of black Pbs to PbSO4 is

(a) 112(b) 22.4(c) 448(d) 224

2. In basic medium, oxidizes to form and itself changes to . How many mL of 0.140 M are required to react with 40 mL of 0.25M ?

(a) 170(b) 190(c) 250(d) 570

3. FeS2 + O2 === Fe2O3 + SO2 (unbalanced). M.W. of FeS2 = 120). Equivalent weight of FeS2 in this reaction is

(a) 120/6(b) 120/9(c) 120/2(d) 120/11

4. CCl4 + SbF3 === CCl2F2 + SbCl3 (unbalanced). Mass in g of SbF3 (MW = 180) needed to produce one gram of Freon-12, i.e., CCl2F2 (MW = 120) is

(a) 0.5(b) 0.6(c) 1.0(d) 0.08

5. 10 mL of NaHC2O4 solution is neutralized by 10 mL of 0.1M NaOh solution. 10mL of the same bioxalate solution is oxidized by a KMnO4 solution in acidic medium. Hence molarity of the KMnO4 solution is

(a) 0.1(b) 0.2(c) 0.02(d) 0.04

6. A 10 g mixture of NaCl and CaCl2 is treated with Na2CO3 solution to ppt the calcium as CaCO3 which is then heated to yield CaO weighing 1.62 g. % by mass of NaCl in the mixture is

(a) 29(b) 71(c) 58(d) 42

7. 2CuSO4 + 4KI === 2CuI + I2 + 2K2SO4; I2 + Na2S2O3 ==== Na2S4O6 + 2NaI50 mL of 0.2 M CuSO4 is allowed to react with an excess of KI solution and the liberated I2 is neutralized by 0.40M Na2S2O3. Volume in mL of hypo needed is

(a) 2.5(b) 12.5(c) 25(d) 50

8. 50mL of 0.1 M solution of a metallic salt reacted with 25mL of 0.1M Na2SO3 oxidising it to Na2SO4 in acid medium. n factor of the metal in the salt is

(a) 1(b) 2(c)

(d) 3

9. Density of (in g.mL1) of a 3.60M H2SO4 that is 24.5% by mass is

(a) 1.8(b) 1.4(c) 1.22(d) 2.8

10. A solution contains 20 mmole of H3PO4 and 10 mmol of NaH2PO4. No. of mmole of NaOH needed to convert al the phosphate to is

(a) 30(b) 50(c) 60(d) 80

11. when equal volumes of 0.1M AgNO3 0.1M NaCl are mixed together is

(a) 0.1M(b) 0.2M(c) 0.05M(d) 0.25M

12. Mn2+ ions are oxidized to by which is reduced to in acid medium. Number of moles of needed to oxidize one mole of Mn2+ is

(a) 2.0(b) 2.5(c) 0.4(d) 11

13. A 12mL of mixture of two hydrocarbons CnH2n and CnH2n+2 required exactly 57 mL of O2 at STP for just complete combustion. 36mL of CO2 was obtained. Mol % of CnH2n is

(a) 25(b) 12.5(c) 50(d) 75

14.

The evolved gases were passed through alkaline pyrogallol solution which absorbs O2(g). The pyrogallol bulb increased in weight b y 0.208g.The residue after ignition reacts just completely with 2.5 mmoles of HCl. %of NaNO3 in the initial sample is

(a) 57.6(b) 43.4(c) 6.9(d) 13.8

15. A 14.8 g mix of NaHCO3 and Na2CO3 was dissolved in water and made up to 1 L. This was treated with an excess of 2M H2SO4 and boiled to remove all dissolved gas. 3.73 L of CO2 (dry) was collected at 740 mm Hg and 295 K. Molarity of Na2CO3 is

(a) 0.25(b) 0.50(c) 1.00(d) 0.125

16. Three pure compounds are formed when 1g portions of element X combine with respectively 0.472g, 0.63g and 0.789g of another element Y. Formula of the first compound is X2Y3; Empirical formula of the third compound is

(a) XY2(b) XY(c) X2Y5(d) XO217. A mixture of CO2 and SO2 has a mass of 2.952 g; it contains a total of 0.053 mole. How many moles f CO2 are there n the mix?

(a) 0.185(b) 0.965(c) 0.02(d) 0.026

18. Au + BrF3 + KF Br2 + KAuF4 (unbalanced) Mass of gold salt (in g) formed when a 73.5 g mixture containing equal masses of all the three reactants is made is (At. wt of Au = 197; F = 19) Br = 80)

(a) 3.9(b) 39(c) 78(d) 19.5

19. In a sample of a mixture of MnO and MnO2 the mass ratio of Mn : 0 = 64 : 36. (At. wt. of Mn = 55). % of MnO inthe sample:

(a) 87(b) 13(c) 93.4(d) 6.6

20. A sample of uranium bearing mineral weighing 1.6 g yielded 0.4 g of U3O8 (M.W. = 842.2). % of U (At. wt/ = 238) in the sample is given by

(a) (0.4/1.6) ( 100

(b) (0.4/1.6 ( (238/842) ( 100

(c) (0.4/1.6) ( 3 ( (842/238) ( 100(d) (0.4/1.6 ( 3 ( (238/842) ( 100

21. Which of the following is chemically equivalent to 25 mL of 0.20N KMnO4 to be reduced to Mn2+ and H2O?

(a) 100 mL of 0.10M H2C2O4(2H2O to be oxidized to CO2 and H2O

(b) 50 mL of 0.10M H3ASO3 to be oxidized to H3ASO4

(c) 25 mL of 0010M H2O2 to be oxidized to O2

(d) 25 mL of 0.10M SnCl2 to be oxidized to Sn4+22. K4Fe(CN)6 + H2SO4KHSO4 + FeSO4 + (NH4)2SO4 + CO. Number of moles of a missing substance in the above equation after balancing is

(a) 2(b) 4(c) 6(d) 8

23. . The sum of the coefficients in the balanced equation is

(a) 8(b) 12(c) 15(d) 20

24. occurs in basic medium. For each mole of formed

(a) 3 moles of H2O are formed(b) 3 moles of H2O are consumed

(c) 6 moles of OH are formed(d) 3 moles of OH are consumed

25. A mixture of one mole each of the solids NaNO3, NaOH and Al is mixed with excess of water. and NH3(g) are formed. Volume of NH3(g) formed at STP is (in L)

(a) 4.2(b) 8.4(c) 2.1(d) 6.3

26. (incomplete and unbalanced) 0.15 mole of Cl2, 0.01 mole of and 0.30 mole of OH are mixed in an aqueous solution. Number of moles of OH left behind after the completion of the reaction is

(a) 0.05(b) 0.07(c) 0.20(d) Nil

27. 5 g of MnO2x on treatment with excess conc. GHCl gives 0.0539 mole of Cl2 according to the equation:

MnO2 + 4HCl . Value of x in the MF is

(a) 0.01(b) 0.075(c) 0.0375(d) 0.20

28. A sample of FeS2 containing inert impurities on burning lose 20% of its weight. % of inert impurities in the sample is 20% of its weight/ % of inert impurities in the sample is 20% of its weight. % of inert impurities in the sample is

(a) 40(b) 60(c) 20(d) 80

29. Mn3O4 on ignition gives MnO and O2. Eq wt of Mn3O4 is

(a) MW(b) MW/3(c) MW/4(d) MW/2

FIITJEE CHENNAI CENTRE. 175 Poonamallee High Road. Opp. Ega Theatre, Kilpauk. Chennai-10 PH. 044 - 42859701

FIITJEE CHENNAI CENTRE. 175 Poonamallee High Road. Opp. Ega Theatre, Kilpauk. Chennai-10 Ph. 044 - 42859701

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