Basic Chemistry Test MCQS PPSC 2019 With Full Book Download in PDF

Basic Chemistry Test

Basic Chemistry TEST MCQ’s

1. Diameter of an atom is in the range of

A. 0.2 m                  B.     0.2 nm
C. 2 x 10-10 nm      D.     0.2 Pm

2. Jinnah The Story of a Nation was Written by:

(a) Stanley           (b)  Shelley
(c)  G Alana (d)  None of these

3. Isotopes differ in the

A. number of atoms
B. number of neutrons
C. number of protons
D. number of electrons

4. For which of the following the term empirical formula cannot be applied?

A. NaCI B.    H20
C. CCI4 D.    It can be applied to all

5. What is correct relationship between empirical and molecular formulas?

A. empirical formula x =Molecular formula
B. empirical formula I n      = Molecular formula
C. empirical formula x  n2  = Molecular formula
D. molecular formula /n      =Empirical formula

6. 98 grams of sulphate ions have ions

A. 6.o2 x ton                    B.  6.o2 x 1023 x 2
C.   4 X 6.02 X  1023      D.  3 X 6.02 X 1023

7. How can you separate the mixture of two gases?

A. Chromatography
B. Crystallization
C. Graham’s Law of diffusion
D. Sublimation

8. When Margaret Thatcher did become the first women Prince Minister of UK?

(a)  1992 (b)  1989
(c) 1979 (d)  1962

9. Which of the following method is used to estimate oxygen in an organic compound?

A. Combustion method
B. Duma’s method
C. KJeldahl’s method
D. All of the above

10. Empirical formula of chloroform is

A. CH2C.2             B. CH3CI
C. CHCI D. CHCh

11. %age of calcium in calcium carbonate is

 A. 80%        B.  30%
C. 40%         D.  20%

12. The empirical formula of the compound having SO% sulphur and SO% oxygen by mass is

A. SO         B.    S203
C. S03        D.   SOz

13. Bromine has two isotopes having the relative abundances as 75Br = 50.51% and 81Br =

A.      81
C.   79.5
B.   80
D.      79

14. World Trade Organization was established in:

(a)  1992 (b)  1993
(c)  1994 (d) 1995

15. The Rio conference on sustainable development was convinced in:

(a)  1972           (b)  1992

(C)  2002 (d)  2012

16. Difference in density is the basis of

A. Ultrafiltration
B.      Molecular sieving
C.     Gravity separation
D. Molecular attraction

17. Communist Manifesto was originally published in which language?

(A) Greek (B)  Russian
(C) French (D) German

18. To differentiate between C-12, C-13 and C-14, the instrument that you would use is

A. infra-red spectrometer
B. atomic absorption spectrometer
C. mass spectrometer
D. ultraviolet spectrometer

19.  The book ‘Wealth of Nations’ was written by:

(A) John Marshal        (B)  Kart Marx
(C) Max Muller           (D)  None of these

20. The empirical formula of a compound is CH20 and its molecular mass is 120. The nuecular formula of the compound is

A. C2H•Oz     B.    C3H603
C. C.HaO•         D.  CH20

21. A gaseous mixture contains SO% helium and SO% methane by volume .

A. 19.97% B.   20.05%
C. SO% D.   80.03%

22. How will you separate a mixture of two gases?

A.    Fractional distillation technique
B. Graham’s Jaw of diffusion technique
C. Osmosis
D.    Chromatography.

23. What Is the net charge on ferrous ion?

A. +2 B.   +3
c. +4 D. +S

MCQs Set 2

24. Isotopes differ in

A. properties which depend upon mass
B. arrangement of electrons in orbitals
C. chemical properties
D. the extent to which they may be affected in electron magnetic field

25. Formation of a cation is

A. Oxidation B.    Reduction
C. Redox         D.   None

26. The relative atomic mass of chlorine is 3S.S.

A. 142g B.   3S.Sg
C. 71g         D.   18.7Sg

27. Current strength measured by electrometer by each type of ions in mass spectrometry shows?

A. Charge
B.    Mass
C. Relative abundance
D.    Number of isotopes

28. The following statements contained in a student’s laboratory report is a conclusion

A. a gas is liberated
B. oxide of the gas is strongly acidic
C. the gas Is chlorine
D. colour of the gas is greenish yellow

29. calculate the volume of Hd when the mass of HCI is 1622.2 g and density is 1.14 g/cm3

A. 1423 em’     B.   1632 cm3
C. 1.10 cm3     D.  1.61cn13

30. One mole of H20 has how many moles of electrons?

A. 2 moles B.  5 moles
C. 8 moles D.  10 moles.

31. What Is the no.of atoms in 9g of water ?

A. 3.01 X 102• B.  3.01 X lOU
c. 6.02 X 1022 D. 6.02 X 1023

32. The number of atoms in 4.25 gram of NH3 is approximately

A. 1X 1023

B. 2 x 1023
C.    1.5 X 1023
D. 6 x 1023

33. Which of the following has least mass?

A. 2 gram atom of nitrogen

B.    3 x 1015 atoms of C
C.    1mole of S
D.   7.0 g of Ag.

34. The number of atoms contained in 11.2   of S02 at S.T.P.are

A 3/2 X  6.02 X  1()23

B 2 X   6.02 X   1023
C. 6.02 X  1023
D.    4 X   6.02 X   1023

35. The total number of protons in 10 g of calcium carbonate is (No= 6.023 x 1023)

A. 1.5057 X  10Z”    B.  2.0478 X  1&4

c. 3.0115 X  1014     D.  4.0956 X   1024

36. 2 g of oxygen contains number of atoms equal to that in

A. 0.5 g of hydrogen

B. 4 g of sulphur
C. 7 g of nitrogen

37. A compound having the highest %age of oxygen by weight is

A. C2HsOH         B.    HCOOH

C. CH3 – OH D.  H20

38. When the following reaction equatio ns is properly balanced, the number of moles of 02 will be C3Ha + 02   C02 + H20

A . 1.5 moles B.  10 moles

C. 3.5 moles D.  3 moles

39. Which of the following contain maximum number of atoms?

A . 6 moles of S

B.    20 moles of Sa
C. 5.0 moles of sol
D.    44.8 dm3 of C02 at s.T.P.

40. SOdm3 of CO is burnt complete ly according to the reaction 2CO + Oz -+ 2COz Choose the correct statement

A. Volume of 02 required is 25 dm3

B. Volume of C02 formed is 60 dm3
C. Volume of 02 required is SO dm3
D. Volume of CO;r formed is 25 dm3

41. In alkaline medium CI02 oxidises HzOz to Oz and itself gets reduced to o·. How many moles of H20z are oxidized by 1mole of CIOz?

A. 1.0     B. 1.5

C. 2.5     D.  3.5

42. 100 g of CaC03 is treated with llitre of 1N HCI. What would be the weight of C02 liberated after the completion of the reaction?

A.  5.5 g         B.  11g

C. 22 g           D.  33 g

43. If we consider that 1/6,in place of 1/12,mass of carbon atom is taken to be the relative atomic mass unit,the mass of one mole of substance will


A. decrease twice

B. increase two fold
C. remains unchanged
D. be a function of the molecular mass of substance

44. 2g of aluminium is treated,separately with excess of dilute H2SO.,and excess of NaOH, the ratio of volumes of hydrogen evolved Is

A.    1:1     B.  2:3

C. 1:2        D.  2: 1

45. The numerical value of N/n (where N is the number of molecules in a given sample of gas and n Is the number of moles of the gas) is

A .  8.314                 B.  6.02 x 1021

C.  1.62 x to·z• D.  0. 1.66 x 10 19

46. A sample of phosphorous trichloride (PC )) contains 1.4 moles of the substance.How many atoms are there in the sample?

A. 4                      B.   5.6

c. 8.431 x 10U     D.  3.372 x toz•

47. If 30 mlof Hz and 20 mlof Oz reacts to form water, what is left at the end ofthe reaction?

A.    10mLofHz        B.   5mlofHz

C.   10 mlofOz         D.  5 mlof(h

48. An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is;

A.   five                 B.   four

C. three                 D.  two

49. The volume in lltres of COzliberated at STP when 10 grams of 90% pure limestone is heated completely is

A. 22.4  B.   2.24

C.   20.16    D.  2.016

50. An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 

A. C3HsOz            B. HtoO

C. ClHtoOz           D.   C.HtoOz

PHYSICAL CHEMISTRY
BASIC CONCEPTS

51. The percentage of oxygen In NaOH is

A. 40     B.   60
C. 8       D.   10

52. What quantity of limestone (CaC03) on heating will give 56 kg of CaO?

A. 1000 kg B.   56 kg

C. 44 kg D.   lOO kg

53. Which of the following has least mass?

A. 2 gram atoms of nitrogen

B. 3 x ton atoms of c
C. 1mole ofS
D.    7.0 g of Ag.

54. 1mole of CH.. contains

A. 6.02 x 1023 atoms of H

B. 4 g-atom of hydrogen
C. 1.81x 1023 molecules of CH.
D. 3.0 g of carbon

55. 2 g of oxygen contains number of atoms equal to that in

A. 0.5 g of hydrogen

B. 4 g of sulphur
C. 7 g of nitrogen
D. 2.3 g of sodium

56. The hydrogen phosphate of certain metal has formula MHPO•. The formula of metal chloride would be

B.  MCL.z

D. MCI3
A.  MCI
C.  M2CI2

57. The largest no.of molecules is in

A. 34 g of water           B.   28 g of COz
C. 46 g of CH10H       D.  54 g of N205

58. Number of atoms in 558.5 g of Fe (At. Mass of Fe = 55.85 g mole-1) is

A. twice that In 60 g carbon

B. 6.022 X   1022
C. half that in 8 g of He
D. 558.5 X 6.022 X 1013

59. To differentiate between C-12, C-13 and C-14, the Instrument that you would use is

A. infra-red spectrometer
B. atomic absorption spectro meter
C. mass spectrometer
D. ultraviolet spectrometer

60. 0.56 g of a gas occupies 280 cm3 at N.T.P., then its molecular mass is

A. 4.8
c. 2
B.    44.8
D.    22.4

61. In alkaline medium CI02 oxideses H202 to 02 and itself gets reduced to Ct-. How many moles of H202 are oxiqized by 1mole of CIOz?

A . 1.0          B.   1.5

c. 2.5 D.   3.5

62. 100 g of CaC03 Is treated with 11itre of 1N HCI. What would be the weight of C02 liberated after the completion of the reaction?

A. 5.5 g B.   11g

C. 22 g D.  33 g

63. If we consider that 1/6, in pla e of 1/12,mass of carbon atom is taken to be the relative atomic mass unit,the mass of one mole of substance will

A. decrease twice

B. increase two fold
C. remains unchanged
D. be a function of the molecular mass-of substance

64. Volume ofO.lM K2Cr201 required to oxidise 35 ml of O.SM FeS04 solution is

A. 29.2 ml B.   17.5 ml
C. 175 ml D.  145 ml

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