For an elementary process - Practice Paper for

Practice Paper for

11. For an elementary process

(a) the order and molecularity are identical (b) the order is twice of molecularity (c) the order is three times the molecularity (d) there is no relation between the order

molecularity.

and

53 CHEMISTRY TODAY | JUNE 06

12. Given £°^A|3+^/AI = -1.66 V, E°^Cu2+^/Cu = +0.34 V. What will happen if we store aluminium nitrate in coper tumbler?

(a) the tumbler gets coated with aluminium (b) the solution becomes blue

13. The length of the side of the unit cell for lithium is 352 pm, calculate its atomic radius. Lithium forms body-centred cubic crystal.

(a) 304 pm (b) 76 pm (c) 608 pm (d) 152 pm.

14. If the radii of A+ and B~ are 95 pm and 181 pm respetively, then the coordination number of A+ will be

(a) 12 (b) 8 (c) 6 (d) 4.

15. The nuclear fission reaction involves the (a) combination of two nuclei to form single nuclide (b) splitting of single nuclide into two nuclei (c) combination of alpha and beta particles (d) combination of [H and ^H .

16. If 360 grams of glucose (C6H,206) is dissolved in 2000 grams of water (essentially 2 litres), what will be the freezing point of this solution?

(a) - 6.58°C (b) - 3 . 7 2 ° C (c) -1.86°C (d) - 0.51°C.

17. Sodium metal is obtained by

(a) the electrolysis of concentrated aqueous NaCl (b) heating N a20 with H2

18. Which of the following tetrahalide of lead is not known?

(a) Pbl4 (b) PbBr4 (c) PbCl4 (d) PbF4. 19. In the reaction : NaOH + S -> X + H20 + Na2S, X is

(a) N a , S 03 (b) Na2S04

20. The oxidation state of iron in its brown ring complex (test for nitrate ion) [Fe(H20)5N0]S04 is

(a) +1 (b) +2 (c) +3 (d) 0.

21. Among the following, the lowest degree of paramagnetism per mole of the compound at 298 K will be shown by

(a) MnS04-4H20 (b) FeS04-6H,0 (c) CuS04-5H20 (d) NiS04-6H,0.

22. In P4O10, each phosphorus atom is linked with ..

oxygen atoms.

(a) 2 (b) 3 (c) 4 (d) 5.

23. The correct IUPAC name of the compound

O CH3

II I CH3 - CH - C - CH, - CH is

CH, CH,

CH,

(a) 2,5-dimethylheptan-4-one (b) 3,6-dimethylheptan-4-one (c) 2-ethyl-5-methylhexan-3-one (d) 1 ,l-dimethyl-4-ethylpentan-3-one.

24. Which of the following Newman projection formula for 1,2-dichloroethane represents the staggered form?

25. The product X in the following reaction is CH3CH CHCH, ^{H , 0 ,}-»- X, ^HIO⁴> X (a) C H , C H - C H - C H , (b) CH, - COOH

OH OH

OH O I II (d) CH,CH - C - CH,

26. The compound X in the following reaction is (OO,

HC CH

(ii)^H^T X (a) glyoxal only

(b) mixture of glyoxal and formic acid (c) butanone (d) ethanal only.

27. Chloretone is

(a) CCljNO, (b) (CH3),C(OH)CCl3

28. The compound X in the following reaction

H,/Ni

CHj - CH = CH - CHO » X is (a) CH3CH2CH2CHO

(b) CH3CH — CH - CH2OH (c) CH3CH2CH2C'H2OH (d) CH, - CH — CH - CH3.

29. A—j-'l ,, —> a-hydroxy propionic acid.

(//) dilute H2S 04

The structure of A is

(a) CH3COOH (b) CH2 = CH - COOH (c) CH3CHO (d) CH3COCH3.

30. Identify the compound B in the following reaction.

(a)

(c)

( Q y so3H

< O ^ 0 H

NaN02/H2S04

0°C -+A _distilled^steam (b) H O3S - © - N H2

(d)

31. When 10 ml of ethyl alcohol (density 0.7893 g/ml) is mixed with 20 ml of water (density 0.9971 g/ml) at 25°C, the final solution has a density of 0.9571 g/ml.

The percentage change in total volume on mixing is (a) 3.1% (b) 2.4%

32. Which is incorrect statements?

(a) a solute will dissolve in water if hydration energy is greater than lattice energy

(b) if the anion is large compared to the cation, the lattice energy will remain almost constant (c) solubility of 1IA hydroxide is in order

Be(OH)2 < Mg(OH)2 < Ca(OH)2 < Sr(OH), (d) all are correct.

33. Which of the following pairs of isomers and types of isomerism are correctly matched?

1. [Co(NH3)5(N02)]Cl2 and [Co(NH3)5(ONO)]Cl2

.... linkage 2. [Cu(NH3)4][PtCU] and [Pt(NH,)4][CuCl4]

.... coordination 3. [Pt(NH3)4CI,]Br2 and [Pt(NH3)4Br2]Cl2

.... ionisation Select the correct answer using the codes given below:

(a) 2 and 3 (b) 1 , 2 and 3 (c) 1 and 3 (d) none of these.

34. 0.0012 mol of CrCl3-6H20 was passed through a cation exchange resin and acid coming out of it required 28.5 mL of 0.125 M NaOH. Hence complex is (a) [Cr(H20)5Cl]Cl2 • H20

(b) [Cr(H20)4Cl2] • 2H20

35. Which of the following statement about Millikan's oil drop experiment is true?

(a) when the electrifc field is turned on, all the oil drops move towards the positively charged plate (b) the charge on each oil drop is the electronic charge (c) in the absence of the electric field, the speed with which the drop falls depends only upon the acceleration due to gravity

(d) some oil drops become positively charged and some become negatively charged after colliding with gaseous ion.

36. Total vapour pressure of mixture 1 mol A (P°4 = 150 torr) and 2 mol B ( = 240 torr) is 200 mm. In this case

(a) there is positive deviation from Raoult's law (b) there is negative deviation from Raoult's law (c) there is no deviation from Raoult's law (d) molecular masses of A and B are also required.

37. If AG = AH- TAS and AG = AH + 7 Jcl(AG) dT then variation of EMF of a cell E, with temperature T is given by

AH AG AS -AS

(a) AG

nF (b) ~~nF

nF nF 38. Silver salt of a dibasic acid has 54% silver. Hence molecular weight of the organic compound is (a) 200 (b) 400 (c) 93 (d) 186.

39. ZnS does not crystallise in the NaCl structure. It is due to

(a) the r+/r~ ratio is 0.402, too low to avoid anion-anion contact in the NaCl structure

(b) the r+/ r ratio is 0.402, too high to avoid cation-cation contact in the NaCl structure

H, C u - Z n CO, H „ [CoH(CO),l

40. CH,CH = CH, —

J - 125° pressure

product This represents oxo method of alcohol synthesis. Product can be

55 C H E M I S T R Y T O D A Y | JUNE 06

(a) CH3CH,CH2CH2OH (b) CH3-CHCH2OH CH,

41. End product of the following sequence of reactions is

C H = C H CH3MgBr> CO^H^O* > HgSOj/HiSOj >

o

(a) C H 3 - C - C O O H (b) CHj(COOH)2

O II

42.

A and B are

(ii) H,0+

(a) H O - ^ - T M O , ( C H3)2N H

(b) H 0 - ^ O ) -O H' (C H3 ) 2 N H

(d) none of these.

4 3' ( 3 ) ~M g B r + C H2 -C H2 —

(a) ( Q ) - C H2O H ( b ) < g ) - C H2C H2O H

-V

44. Match the reactions taking place in a blast furnance with temperature-range of operations.

Reactions Temperature range A. Fe20 + CO -> C02 + FeO I. 1800 °C B. CO C + CO, II. 800°C C. FeO + CO Fe + C 02 111. 500-600°C D. CaO + Si02 CaSi03 IV. 400°C Choose the correct alternate.

(a) A-1V, B-11I, C-II, D-I (b) A-IV, B-II, C-III, D-I (c) A-l, B-ll, C-1V, D-II1 (d) A-I, B-II, C-III, D-IV.

45. When KI (excess) is added to

I. CuS04 II. HgCI, III. Pb(N03)2

(a) a white ppt. of Cul in I, an orange ppt. of Hgl2 in II and a yellow ppt. of Pbl, in III

(b) a white ppt. of Cul in I, an orange ppt. dissolving to Hgl42~ in II, and a yellow ppt. of Pbl, in III (c) a white ppt. of Cul, Hgl, and Pbl2 in each case (d) none is correct.

46. A B (oxide) + CO,,

B + H20 -> C, C + C 02 -> A (milky), C + NH4C1 — ^ D (gas)

D + H20 + C02 E ; E + NaCl F F - A * Na2C03 + C 02 + H , 0

Name of the process is

(a) Solvay (b) ammonia-soda (c) both are correct (d) none is correct.

47. CO, gas along with solid (K) is obtained when sodium salt (X) is heated. (AO is again obtained when CO, gas is passed into aqueous solution of (Y). X and Y are

(a) Na2C03, N a20 (b) Na,C03, NaOH (c) NaHCOj, Na,C03 (d) Na,C03, NaHCO,.

48. The statement is not true for the long form of the periodic table.

(a) it reflects the sequence of filling the electrons in the order of the sub-energy shells .s, p, d and / (b) it helps to predict the stable valency states of the

elements

(d) it helps to predict the relative ionicity of the bond between any two elements.

49. CH3CH2CH2CH,CI

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