This document contains an unsolved chemistry past paper from 2002 containing 50 multiple choice questions testing various chemistry concepts. The questions cover topics such as solubility, bond energies, oxidation states, reaction types, standard reduction potentials, and thermodynamic properties. The document provides the questions along with four possible answer choices for each, but does not include the solutions.

1. AMU –PAST PAPERS
CHEMISTRY- UNSOLVED PAPER - 2002

2. SECTION – I
 Single Correct Answer Type
 There are five parts in this question. Four choices are given for each part and one of them is
correct. Indicate you choice of the correct answer for each part in your answer-book by
writing the letter (a), (b), (c) or (d) whichever is appropriate

3. 01 Problem
Which of the following carbonates is last soluble in water ?
a. NaHCO3
b. CaCO3
c. MgCO3
d. Na2CO3

4. 02 Problem
The bond energies of F2, Cl2 Br2 and I2 are 155, 244, 193 and 151 kJ/mol. The
weakest bond will be in :
a. Cl2
b. I2
c. Br2
d. F2

5. 03 Problem
The number of unpaired electrons in ferrous ion is :
a. 3
b. 2
c. 5
d. 4

6. 04 Problem
How many optically active isomers are possible for butane –2, 3-diol ?
a. 2
b. 4
c. 1
d. 3

7. 05 Problem
One mole of SO2 corresponds to
a. 6.4 g of SO2
b. 6.02 x 1023 molecules of SO2
c. 22.4 L at 250C and 1 atm
d. all the these

8. 06 Problem
Which of the following statements about vitamin B12 is false ?
a. It has a cobalt atom
b. It also occurs in plants
c. It is present in rain water
d. It is needed for human body in very small amounts

9. 07 Problem
A mixture of benzoic acid and naphthalene can be separated by crystallization
from :
a. Cold water
b. Ether
c. Hot water
d. Benzene

10. 08 Problem
The internal energy of one mole of a gas is :
3
a. 2 KT
1
b. 2 KT
3
c. 2 RT
1
d. 2 RT

11. 09 Problem
The term pH comes from :
a. “pure voiv hydrogene” which implies potential of hydrogen
b. pure hydrogen content
c. purity of hydrogen ions in solution
d. name of the scientist associated

12. 10 Problem
The number of atoms in 0.004 g of magnesium is close to :
a. 2 x 1020
b. 6.02 x 1023
c. 24
d. 1020

13. 11 Problem
Propene when heated with chlorine at about 5000C forms :
a. CH2Cl – CH = CH2
b. CH3 – CHCl – CH2Cl
c. CH2Cl – CHCl – CH2Cl
d. All of these

14. 12 Problem
Absolute alcohol is :
a. 95% ethanol
b. 75% ethanol
c. 100% ethanol
d. mixture of various primary alcohols

15. 13 Problem
CH3CHO HCN
X H2O / H
Y In the above sequence Y is :
a. Lactic acid
b. Formic acid
c. Cinnamic acid
d. Acetic acid

16. 14 Problem
Aniline reacts with concentrated HNO3 to give :
a.
b.
c.
d.

17. 15 Problem
Which one of the following is most basic ?
a. Cl -
b. F –
c. I –
d. Br –

18. 16 Problem
The volume strength of 1.5 N H2O2 solution is :
a. 5.2
b. 8.4
c. 8.8
d. 4.8

19. 17 Problem
the highest number of unpaired electrons are present in :
a. Fe4+
b. Fe3+
c. Fe0
d. Fe2+

20. 18 Problem
The nineteenth electron chromium has which of the following set of quantum
number ?
n l m s
1
a. 3 0 0 2
1
b. 3 2 -2 2
1
c. 4 0 0 2
1
d. 4 1 -1 2

21. 19 Problem
What is the correct sequence of bond order ?
a. O2+ > O2- > O2
b. O2 > O2-1 > O2+1
c. O2+ > O2 > O2-
d. O2-1 > O2+1 > O2

22. 20 Problem
Bond order of N – O bonds in nitrate ion is :
a. 1.25
b. 1.50
c. 1.33
d. 1.0

23. 21 Problem
Which bond is most polar ?
a. F – F
b. I – F
c. Cl – F
d. Br – F

24. 22 Problem
The effect of a catalyst in a chemical reaction is to change the :
a. Equilibrium concentration
b. Heat of reaction
c. Activation energy
d. Final product

25. 23 Problem
Which of the following aqueous solutions will have highest freezing point :
a. 0.1 m CaCl2
b. 0.1 m KCl
c. m glucose
d. m Al2(SO4)3

26. 24 Problem
Which oxidation numbers are shown by carbon ?
a. - 1, - 2, - 3, - 4
b. 4, + 3, + 2, + 1
c. 0
d. All of these

27. 25 Problem
The spectrum of He+ is expected to be similar to that of :
a. Be+2
b. Li+
c. Na
d. H

28. 26 Problem
Bleaching action. Of SO2 is due to :
a. Oxidation
b. Reduction
c. Hydrolysis
d. Its acidic nature

29. 27 Problem
Water gas is essentially a mixture of ?
a. H2O(g) and CO2
b. H2O and CO
c. H2 and CO
d. CO and CO2

30. 28 Problem
Which is the strongest reducing agent ?
a. Mg
b. Rb
c. Na
d. K

31. 29 Problem
Mortar is a mixture of slaked lime and sand in the ratio :
a. 1 : 4
b. 2 : 3
c. 1 : 3
d. 3 : 1

32. 30 Problem
Which of manufactured by electrolysis of fused NaCl ?
a. NaClO3
b. NaClO
c. NaOH
d. Na

33. 31 Problem
The wire in the flash bulbs is made up of :
a. Ag
b. Cu
c. Ba
d. Mg

34. 32 Problem
K4[Fe(CN)6] is called :
a. Prussian blue
b. Potasium ferricyanide
c. Potassium hexacyano ferrate (II)
d. Potassium hexacyanoferrate (III)

35. 33 Problem
Which of the following does not react with AgCl ?
a. Na2CO3
b. Na2S2O3
c. NH4OH
d. NaNO3

36. 34 Problem
The number of moles of KMnO4 that will be needed to react with one mole of
sulphite ion in acidic solution is :
a. 1
b. 4/5
c. 3/5
d. 2/5

37. 35 Problem
Anorganic compound X on treatment with acidified K2Cr2O7 gives compound Y.
Which reacts with I2 and sodium carbonate to form triiodomethane. The
compound X can be :
a. CH3CH(OH)CH3
b. CH3CHO
c. **
d. CH3OH

38. 36 Problem
The reaction of HCOOH with conc. H2SO4 gives :
a. CH3COOH
b. (COOH)2
c. CO2
d. CO

39. 37 Problem
Formalin is :
a. 40% solution of formaldehyde in acetaldehyde
b. 40% solution of formaldehyde in acetone
c. 40% solution of formaldehyde in water
d. liquid formaldehyde

40. 38 Problem
Alcohol reacts with Grignard reagent to form :
a. Alkanes
b. Alkenes
c. Alkynes
d. All of these

41. 39 Problem
Acetone
RCl + NaI R – I + NaCl This reaction is known as :
a. Wurtz reaction
b. Fitting reaction
c. Frankland reaction
d. Finkelstein reaction

42. 40 Problem
The weight in g of 1 curie of radioactive element 200X having a t1/2 of 69.3 min is :
a. 3.0 x 10-8 g
b. 7.4 x 10-8 g
c. 3.7 x 10-8 g
d. 200 g

43. 41 Problem
Gold number is minimum in case of :
a. Gum Arabic
b. Starch
c. Egg albumin
d. Gelatin

44. 42 Problem
The standard reduction potential of Li+/Li, Ba2+/Ba, Na+/Na and Mg2+/Mg are –
3.05, - 2.73, - 2.71 and – 2.37 volt respectively. Which one of the following is
strongest oxidizing agent ?
a. Ba2+
b. Mg2+
c. Na+
d. Li+

45. 43 Problem
Carbon is in the lowest oxidation state in :
a. CO2
b. CF4
c. CCl4
d. CH4

46. 44 Problem
Oxidation state of nitrogen is correctly given for :
Compound Oxidation state
a. Mg3N2 -3
b. NH2OH +1
c. (N2H5)2SO4 +2
d. [CO(NH3)5Cl]Cl2 0

47. 45 Problem
The solubility product of AgCl is 4.0 x 10-10 at 298 K The solubility of AgCl
a. 5.0 x 10-9 M
b. 2.0 x 10-5 M
c. 2.2 x 10-4 M
d. 1.0 10 -4 M

48. 46 Problem
The standard free energy change ( G0 ) is related to equilibrium constant (K)
as :
a. G0 = - 2.303 RT log K
b. G0 = RT log K
c. G0 = 2.303 RT log K
d. G0 = -2.303 RT In K

49. 47 Problem
Fro reversible process, the value of S is given by the expression :
a. q(rev) x T
b. q(rev) T
c. H/ T
d. T

50. 48 Problem
The final product of this reaction is/are
a.
b.
c.
d.

51. 49 Problem
The energy of an electron in nth orbit of hydrogen atom is :
a. 13.6
eV
n
13.6
b. eV
n2
13.6
c. 3
eV
n
13.6
d. eV
n4

52. 50 Problem
Which out of the following is called Blue John’ ?
a. CaF2
b. CaO
c. CaH2
d. Ca3P2

53. FOR SOLUTIONS VISIT WWW.VASISTA.NET