NTS Chemistry MCQs Online With Answers

NTS-National Testing System Pakistan is a non-governmental organization that conducts screening tests for admission, scholarship, internship, recruitment, and promotion jobs. These exams are conducted to eliminate eligible candidates for the given post on a merit basis. Candidates who have applied or want to apply for the NTS test and jobs or admission need to qualify for the NTS test. NTS examination includes many subject-wise tests and chemistry is one of the vital parts and candidates have to clear them. Preparation for the NTS Chemistry MCQs Online is mandatory to score high marks.

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NTS Chemistry MCQs Online with Answers

1. The branch of chemistry that deals with radioactivity, nuclear processes, and properties is called
(a) Industrial Chemistry
(b) Biochemistry
(c) Nuclear chemistry
(d) Analytical chemistry

2. Silicon forms ………… percent of earth’s crust
(a) 8 %
(b) 47%
(c) 28%
(d) 78%

3. Elements are represented by …..
(a) Formulas
(b) Signs
(c) Symbols
(d) Abbreviation

4. The symbol of thiosulphate is …………
(a) SO4-2
(b) SO3-2
(c) S2O3-2
(d) SO4-3

5. The chemical formula of limestone is
(a) CaO
(b) CaCO3
(c) C12H22O11
(d) SiO2

6. Atomic mass unit is abbreviated as
(a) AMU
(b) A¬mu
(c) aMu
(d) Amu

7. The empirical formula of benzene is
(a) HC
(b) CO
(c) CH
(d) OH

8. An atom having a positive charge is called
(a) Canion
(b) Anion
(c) Cation
(d) Ion

9. When a molecule loses or gains an electron it forms a ………….
(a) Anion
(b) Cation
(c) Ion
(d) Molecular ion

10. Avagodro’s number is
(a) 6.62* 1023
(b) 6.00*1023
(c) 6.02*1023
(d) 6.02*1024

11. Proton was discovered by
(a) Goldstein
(b) Thomas
(c) Daniel
(d) Emil

12. Except electrons all other fundamental particles that lie within the nucleus
(a) Nucleolus
(b) Neutrons
(c) Nucleons
(d) Protons

13. Shell N has sub-shells
(a) One
(b) Two
(c) Three
(d) Four

14. Beryllium has electronic configuration
(a) 1s1
(b) 1s2,2s2,2p1
(c) 1s2,2s1
(d) 2s2,2p4

15. The hydrogen third isotope is
(a) Tritium
(b) Protium
(c) Deuterium
(d) Aluminum

16. To determine the age of carbon-containing products the radioactivity of ……….. isotope is measured
(a) C12
(b) C13
(c) C14
(d) C15

17. Neutron was discovered in ……………
(a) 1931
(b) 1932
(c) 1933
(d) 1934

18. Relationship between atomic masses of several groups of three elements
(a) Tetrad
(b) Triad
(c) Bivalent
(d) Pentavalent

19. The electronic configuration of the boron family is
(a) ns1
(b) ns2
(c) ns2 np1
(d) ns3 np4

20. Br35 has electro negativity
(a) 4.0
(b) 3.2
(c) 3.0
(d) 2.7

21. Attaining eight electrons in the valence shell is called
(a) Triad rule
(b) Tetrad rule
(c) Duplet rule
(d) Octet rule

22. The bond forms due to the mutual sharing of electrons
(a) Ionic bond
(b) Covalent bond
(c) Bond
(d) Electronic bond

23. The energy required to break the bond between hydrogen and chlorine in hydrogen chloride is
(a) 410kJ
(b) 420kJ
(c) 430kJ
(d) 440kJ

24. One Pascal is equal to
(a) 1Nm-2
(b) N-2
(c) NM-2
(d) Nm-3

25. All intermolecular forces collectively called
(a) Dipole-dipole
(b) Hydrogen bonding
(c) Van der Waals
(d) Ionic bonding

26. ………… configuration is stable one
(a) Metallic
(b) Noble gas
(c) Ionic
(d) Electronic

27. Identify the compound which is not soluble in water
(a) NaCl
(b) C6H6
(c) KBr
(d) MgCl2

28. The product of pressure and volume of a fixed mass of gas is constant at a constant temperature
(a) Pascal’s law
(b) Newton’s law
(c) Boyle’s law
(d) Charles’s law

29. Diethyl ether has a freezing point
(a) -115C
(b) -116C
(c) -113C
(d) -114C

30. The existence of an element in more than one form in the same physical state
(a) Electroplating
(b) Galvanization
(c) Allotropy
(d) Sympatery

31. Solids are classified as crystalline and
(a) Metals
(b) Amorphous
(c) Allotropic
(d) Vapours

32. Metal alloys like ( brass, and bronze ) has both elements …………
(a) Solids
(b) Liquids
(c) Gas
(d) Vapors

33. Molarity is represented by …….
(a) M
(b) m
(c) Mol
(d) Mole

34. CuSo4 stands for
(a) Calcium sulphate
(b) Carbon sulphate
(c) Crommium sulphate
(d) Copper sulphate

35. Particles of colloids are big enough to scatter the beam of light called
(a) Tyndall effect
(b) Greenhouse effect
(c) Vander wall effect
(d) Charles effect

36. Loss of electron is called
(a) Oxidation
(b) Reduction
(c) respiration
(d) Redox reaction

37. In a neutral molecule the algebraic sum of the oxidation number of all elements is
(a) 1.0
(b) 0
(c) 0.01
(d) 0.001

38. Substances that can conduct electricity in their aqueous solutions called
(a) Non electrolytes
(b) Electrolytes
(c) Strong electrolytes
(d) Week electrolytes

39. A galvanic cell consists of ………… cells
(a) Two
(b) Three
(c) One
(d) Four

40. When NaCl disassociates, Na has ……….. charge
(a) Positive
(b) Negative
(c) Neutral
(d) Two

41. 2Cl-(l) gives us on oxidation
(a) Cl2(g) + 2e-
(b) 2Cl2(g) + 2e+
(c) Cl3(g) + 2e-
(d) 2Cl2(g) + 3e-

42. Depositing one metal over another called
(a) Allotropy
(b) Distillation
(c) Sublimation
(d) Electroplating

43. ‘’ K ‘’ has ………… atom number
(a) 18
(b) 19
(c) 22
(d) 11

44. Silver is lustrous metal
(a) Grey
(b) White
(c) Golden
(d) Brown

45. Gold is a yellow soft ………….
(a) Alloy
(b) Solid
(c) Metal
(d) Crystal

46. The ionic size of calcium is
(a) 186,102 pm
(b) 160,72 pm
(c) 197,99 pm
(d) 170,81 pm

47. The property of metals to lose their valance electrons called
(a) Electro negativity

(b) Electro positivity
(c) Allotropy

(d) Ionization

48. The element in a group 2 are called
(a) Alkali
(b) Metal
(c) Alkaline earth
(d) Alloy

49. Alkali metal does not react with ………… directly
(a) Hydrogen
(b) Carbon
(c) calcium
(d)Nitrogen

50. The ionization energy of magnesium is
(a)496 kJ/mol
(b) 738, 1450 Kj/mol
(c) 590,1145 kJ/mol
(d) 650,839 kJ/mol

51. When an electron is brought from an infinite distance close to the nucleus of the atom, the energy of the Electron-nucleus system?

(a) increases to a smaller negative value
(b) decreases to a greater negative value
(c) decreases to a smaller positive value
(d) increases to a greater positive value

52. The probability of finding the electron in the nucleus is:

(a) 100% due to forces of attraction
(b) finite for all orbitals
(c) Zero for all orbitals
(d) Zero for some orbitals and finite for others

53. When Zn metal is kept in CuSO4solution, copper is precipitated and ZnSO4is formed because:

(a) Atomic number of Zinc is smaller than copper
(b) Atomic number of Zinc is larger than copper
(c) Standard reduction potential of Zinc is more than that of copper
(d) Standard reduction potential of Zinc is less than that of copper

54. Electrolytes when dissolved in water, dissociate into their constituent ions, the degree of
dissociation of an electrolyte increases with the:
(a) Presence of a substance yielding common ion
(b) Decreasing temperature
(c) Decreasing concentration of electrolyte
(d) Increasing concentration of electrolyte

55. There is a large positive entropy change for an exothermic reaction. It means that the reaction
will be:

(a) possible at high temperatures only
(b) impossible at all temperatures
(c) possible at low temperatures only
(d) possible at all temperatures

56. Which of the following statements is false?

(a) The temperature of the system will fall if an exothermic reaction is isolated from its
surroundings
(b) Energy is absorbed when one compound is converted into another with a higher heat content
(c) The temperature of the system is likely to fall if heat is absorbed during the course of a
reaction
(d) None of these

57. pH + pOH of a solution is:
(a) 7

(b) Zero

(c) 14

(d) -14

58. The compound that is not Lewis acid:
(a) BF3

(b) BaCl2
(c) SnCl4
(d) AlCl3

59. Ore of Aluminium:
(a) Calamine
(b) Dolomite
(c) Bauxite
(d) Limestone

60. Oxidation number of S in sulphuric acid:
(a) Four
(b) Six
(c) Two
(d) Eight

61. D-block elements form coordination compounds because of the following:
(a) Small Cationic size
(b) Large ionic Charge
(c) Unfilled d-orbitals
(d) Filled d-orbitals

62. Brass is an alloy of:
(a) Cu and Zn
(b) Cu, Ni, Zn
(c) Cu and Ni
(d) Cu, Al, Zn

63. Urea is a high-quality nitrogenous fertilizer with:
(a) 76% nitrogen
(b) 46% nitrogen
(c) 66% nitrogen
(d) 26% nitrogen

64. Diamond is:

(a) Good conductor of electricity
(b) Bad conductor of electricity
(c) Bad conductor on heating
(d) Good conductor on heating

65. Carbon monoxide is poisonous gas because of it:
(a) replaces oxygen from the lungs
(b) forms carboxy hemoglobin
(c) Forms carbon dioxide with oxygen
(d) has a sweet smell

66. Rust is:
(a) FeO + Fe(OH)2
(b) Fe2O3 + Fe(OH)2
(c) Fe2O3
(d) Fe2O3 + Fe(OH)3

67. Calcium Carbide reacts with water to give:
(a) Methane
(b) Ethylene
(c) Acetylene
(d) Ethane

68. Which of the following substituents deactivates the benzene ring and is o, p-directing?
(a) __ NH2
(b) __ Cl
(c) __ OCH3
(d) __ OH

69. Which of the following is most readily nitrated?
(a) Toluene
(b) Benzaldehyde
(c) Nitrobenzene
(d) Benzoic Acid

70. Ketones can be prepared by reaction of Grignard reagent with:
(a) Acid Amides
(b) Acid Chloride
(c ) Carboxylic Acid
(d) Epoxides

71. Which of the following statements about the order of reaction is true?
(a) The order of a reaction can only be determined by experiment.
(b) A second-order reaction is also bimolecular
(c) The order of reaction must be a positive integer
(d) The order of reaction increases with increasing temperature.

72. Polysaccharides yield many monosaccharides on:
(a) Hydration
(b) Oxidation
(c) Reduction
(d) Hydrolysis

73. Which of the following is not aromatic?
(a) Benzene
(b) cyclooctatetraene
(c) Pyridine
(d) Phenol

74. Which of the following is most basic?
(a) H2O
(b) NH3
(c) CH3NH2
(d) CH3OH

75. Which of the following has the lowest pH?
(a) CH3COOH
(b) CF3COOH
(c) ClCH2COOH
(d) Cl3C COOH

76. The equilibrium of two readily interconvertible isomers is called:
(a) Stereoisomerism
(b) Metamerism
(c) Tautomerism
(d) Polymorphism

77. Which of the following gives tertiary alcohol when treated with Grignard reagent:
(a) HCHO
(b) CH3CHO
(c) C3H5CHO
(d) CH3COCH3

78. Which of the following tests is not used to identify aldehydes?
(a) Tollen’s test
(b) Benedict solution test
(c) Fehling solution test
(d) Ammonia test

79. Which is incorrect about alkaloids?
(a) Naturally Occurring
(b) Possess a heterocyclic ring
(c) Exhibit biological action
(d) acidic in nature

80. Which of the following will not give the iodoform test:
(a) Acetone
(b) Ethyl alcohol
(c) Benzaldehyde
(d) Acetaldehyde

81. The reaction of aniline with bromine water gives:
(a) o-bromoaniline
(b) p-bromoaniline
(c) 2,4-dibromo aniline
(d) 2,4,6-tribromoaniline

82. The reaction of tripalmitin, with sodium hydroxide is called:
(a) Hydrolysis
(b) Saponification
(c) Esterification
(d) Combustion

83. Which one is not Petrochemical?
(a) Naphthalene
(b) Mineral Oil
(c) Wax
(d) Table Salt

84. Chemical adsorption:
(a) is exothermic
(b) is irreversible
(c) takes place at high temp.
(d) All of these

85. The most commonly used absorbent for chromatographic separation of organic compounds is:
(a) Activated charcoal
(b) Fuller’s Earth
(c) Alumina
(d) Silica gel

86. Grignard reagent is:
(a) Organo Zinc halide
(b) Organo cadmium bromide
(c) n-Butyl Lithium
(d) Organic Magnesium halide

87. The antifreeze compound ethylene glycol has the formula:
(a) C2H5OH
(b) CH3OH
(c) C2H4(OH)2
(d) C3H5(OH)3

88. Distillation is the best method for separating the two substances in which of the following:
(a) Water and salt dissolved
(b) water and a substance that does not dissolve in it
(c) Two liquids that have different boiling points
(d) Two solids that have different melting points.

89. Which functional group is present in polyester shirts?
(a) Lactam
(b) Acid Chloride
(c) Ether
(d) Ester

90. Which one of the following is used as an Antibiotic?
(a) Patulin
(b) Insulin
(c) Soserine
(d) Trypsin

91. Which statement is true for Halogen (Halo-group)?
(a) Activating and O, p–directing
(b) Activating and m–directing
(c) Deactivating and O, p–directing
(d) None of these.

92. Which one of the following can be synthesized from Aryl Diazonium Salt?
(a) Furfural
(b) Carbylamine
(c) Biphenyl
(d) THF

93. The Methyl group in Methyl Magnesium Iodide can act as:
(a) CH3Radical
(b) CH3Carbonium ion
(c) CH3Carbanion
(d) Can react with a base

94. Nylon is a copolymer of:
(a) Urea and Formaldehyde
(b) Phenol and Formaldehyde
(c) Hexamethylenediamine and adipic acid
(d) Vinyl Chloride and Vinyl alcohol

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