FPSC Lecturer Chemistry Past Paper 2021
1. Which of the following given complex is diamagnetc
a. [Fe(CN)6]4-
b. [Cu(NH3)4]2+
c. [Ti(H2O)6]3+
d. none
2. Atoms having same atomic number but different mass number is
a. isotopes
b. isobars
c. isotones
d. none
3. Which law is applicable for ideal gas
a. Boyles law
b. Charles law
c. Gay Lussac law
d. all of above
4. What is Ecell of a given system when n=2, lnk = -2.59 and Eo = -2.6
a. 0.333
b. 0.033
c. 0.002
d. none
5. Alpha particles contain
a. 1 proton , 1 neutron
b. 1 proton, 2 neutron
c. 2 proton, 2 neutrons
d. none
6. Mass of one alpha particle is
a. 1
b. 2
c. 4
d. none
7. Benzoic acid has how many sigma and pie bonds
a. 15 sigma and 4 pie
b. 13 sigma and 4 pie
c. 13 sigma and 3 pie
d. none
8. U-238 has how many neutrons present in its structure
a. 92
b. 146
c. 160
d. none
9. Which of the following statement is wrong
a. Heat flow from system to surrounding is endothermic
b. heat is +q when absorbed by system from surrounding
c. +q for endothermic process
d. none
10. KHSO4 is
a. acid
b. base
c. salt
d. none
11. Oxidation state of K2Cr2O7 is
a. -6
b. +6
c. 12
d. none
12. Br-CH2-CH2-CH2-I, when reat with NaCN, it will give
a. Br-CH2-CH2-CH2-Na
b. Br-CH2-CH2-CH2-CN
c. Br-CH2-CH2-CH2-CH3
d. none
13. Which of the following pair has chemical properties
a. S and B
b. Cl and Ar
c. O and S
d. none
14. Which is true for Br2
a. It is a solid at room temperature
b. It is a liquid at room temperature
c. It is a gas at room temperature
d. none
15.What condition is true if gas obey real behaviour
a. low temperature, high pressure
b. low temperature, low pressure
c. high temperature, low pressure
d. none
16. Which statement is not true about aromaticity
a. structure should be cyclic
b. structure should have planar structure
c. It does not follow Huckle rule
d. none
17. What is molarity of 30% H2O2 having a density of 1.12g/dm3?
a. 10
b. 1
c. 0.1
d. None
18. At sea level, dense air is application of
a. Charles law
b. Daltons law
c. Boyles law
d. none
19. Shortest bond among following is
a. Cl2
b. N2
c. H2
d. None
20. Orientation of orbitals is given by which quantum number
a. principal quantum number
b. azimuthal quantum number
c. magnetic quantum number
d. spin quantum number
21. Principal quantum number describes the
a. Size of atom
b. Shape of atom
c. Magnetic moment
d. None
22. A half cell of Cu/Cu2+ is
a. voltaic cell
b. electrolytic cell
c. alkaline cell
d. none
23. If 1 liter KNO2 is added to a solution of Nitrous acid, pH will be
a. increased
b. decreased
c. remain same
d. none
24. d2sp3 is associated with which geometry
a. square planar
b. octahedral
c. trigonal planar
d. none
25. Which statement is wrong about electrophilic substitution reaction
a. Alkylation is done by lewis acid
b. Alkene gives electrophilic substitution easily
c. Benzene gives electrophilic substitution easily
d. None
26. Which option is right one for the complex [Cu(NH3)4(H2O)(Br)]
a. Overall complex has -1 charge
b. Overall complex has +1 charge
c. Overall complex has -2 charge
d. none
27. Catalytic efficiency of two enzymes is observed by
a. obtained product
b. size of enzyme
c. affiity of enzyme with substrate
d. none
28. Alkene can be prepared from alkane by using
a. strong base
b. weak base
c. strong acid
d. none
29. Best method for the preparation of primary amines is
a. RCH2CH3
b. RCH2OH
c. RCHO
d. none
30. Correct order of the following bonds is
a. S-F < S-Cl < S-Br
b. S-F > S-Cl > S-Br
c. S-Cl > S-F > S-Br
d. none
31. A radioactive compound after 3 half lives will be
a. 1/2
b. 1/4
c. 1/8
d. 1/16
32. Half life of a radioactive compound is 5 minutes. How much it will deacy after 20 minutes
a. 1/2
b. 1/4
c. 1/8
d. 1/16
33. Choose the correct option on base of bond length
a. C=O > C=C > C-C
b. C=O < C=C < C-C
c. C-C > C=O > C=C
d. none
34. Half life of any radioactive element after decay will be
a. increase
b. decrease
c. remains same
d. none
35. What will be the equation for real gas at high pressure
a. PV=RT -Pb
b. PV=RT + Pb
c. PV=RT
d. none
36. Which of the following is a storage energy
a. work
b. heat
c. internal energy
d. none
37. The plot of lnK Vs 1/T is linear with the slope of
a. -Ea / R
b. Ea / R
c. Ea /2.303 R
d. none
38. Elements having 5d and 4f electrons except
a. Cu
b. Er
c. Hf
d. none
39. Ka value of acetic acid is 1.8 * 105 and molarity of solution is 0.1. The pH will be
a. 0.1
b. 0.01
c. 10
d. none
40. Transition elements are mostly colored due to
a. they are alloy
b. they are metals
c. they show d.d transition
d. none
41. Formula of washing soda is
a. Na2CO3
b. NaOH
c. LiOH
d. NaHCO3
42. Temporary hardness of water can be removed by
a. boiling
b. zeolite
c. fusion method
d. none