NTS Chemistry Important Mcqs with answers

The National Testing System (NTS) is Pakistan’s leading non-governmental organization dedicated to conducting transparent screening tests for admissions, scholarships, internships, recruitments, and promotions. These exams are designed to select eligible candidates strictly on a merit basis. For many of these tests, Chemistry is a vital subject, and candidates must perform well in this section to secure high marks in the overall result.

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NTS Chemistry Important Mcqs with answers

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Important NTS Chemistry MCQs 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

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
2. Silicon forms ………… percent of earth’s crust
(a) 8 %
(b) 47%
(c) 28%
(d) 78%

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
3. Elements are represented by …..
(a) Formulas
(b) Signs
(c) Symbols
(d) Abbreviation
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

4. The symbol of thiosulphate is …………
(a) SO4-2
(b) SO3-2
(c) S2O3-2
(d) SO4-3
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

5. The chemical formula of limestone is
(a) CaO
(b) CaCO3
(c) C12H22O11
(d) SiO2
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]
7. The empirical formula of benzene is
(a) HC
(b) CO
(c) CH
(d) OH
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

8. An atom having a positive charge is called
(a) Canion
(b) Anion
(c) Cation
(d) Ion
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

10. Avagodro’s number is
(a) 6.62* 1023
(b) 6.00*1023
(c) 6.02*1023
(d) 6.02*1024
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

11. Proton was discovered by
(a) Goldstein
(b) Thomas
(c) Daniel
(d) Emil
[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
13. Shell N has sub-shells
(a) One
(b) Two
(c) Three
(d) Four
[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
15. The hydrogen third isotope is
(a) Tritium
(b) Protium
(c) Deuterium
(d) Aluminum

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
16. To determine the age of carbon-containing products the radioactivity of ……….. isotope is measured
(a) C12
(b) C13
(c) C14
(d) C15

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
17. Neutron was discovered in ……………
(a) 1931
(b) 1932
(c) 1933
(d) 1934
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
19. The electronic configuration of the boron family is
(a) ns1
(b) ns2
(c) ns2 np1
(d) ns3 np4

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
20. Br35 has electro negativity
(a) 4.0
(b) 3.2
(c) 3.0
(d) 2.7
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
21. Attaining eight electrons in the valence shell is called
(a) Triad rule
(b) Tetrad rule
(c) Duplet rule
(d) Octet rule

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]
22. The bond forms due to the mutual sharing of electrons
(a) Ionic bond
(b) Covalent bond
(c) Bond
(d) Electronic bond

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
23. The energy required to break the bond between hydrogen and chlorine in hydrogen chloride is
(a) 410kJ
(b) 420kJ
(c) 430kJ
(d) 440kJ

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
24. One Pascal is equal to
(a) 1Nm-2
(b) N-2
(c) NM-2
(d) Nm-3

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
25. All intermolecular forces collectively called
(a) Dipole-dipole
(b) Hydrogen bonding
(c) Van der Waals
(d) Ionic bonding

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
26. ………… configuration is stable one
(a) Metallic
(b) Noble gas
(c) Ionic
(d) Electronic

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
27. Identify the compound which is not soluble in water
(a) NaCl
(b) C6H6
(c) KBr
(d) MgCl2

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
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
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

29. Diethyl ether has a freezing point
(a) -115C
(b) -116C
(c) -113C
(d) -114C
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

30. The existence of an element in more than one form in the same physical state
(a) Electroplating
(b) Galvanization
(c) Allotropy
(d) Sympatery
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

31. Solids are classified as crystalline and
(a) Metals
(b) Amorphous
(c) Allotropic
(d) Vapours
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
33. Molarity is represented by …….
(a) M
(b) m
(c) Mol
(d) Mole

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
34. CuSo4 stands for
(a) Calcium sulphate
(b) Carbon sulphate
(c) Crommium sulphate
(d) Copper sulphate

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]
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

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
36. Loss of electron is called
(a) Oxidation
(b) Reduction
(c) respiration
(d) Redox reaction

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
38. Substances that can conduct electricity in their aqueous solutions called
(a) Non electrolytes
(b) Electrolytes
(c) Strong electrolytes
(d) Week electrolytes
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

39. A galvanic cell consists of ………… cells
(a) Two
(b) Three
(c) One
(d) Four
[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
41. 2Cl-(l) gives us on oxidation
(a) Cl2(g) + 2e-
(b) 2Cl2(g) + 2e+
(c) Cl3(g) + 2e-
(d) 2Cl2(g) + 3e-

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
42. Depositing one metal over another called
(a) Allotropy
(b) Distillation
(c) Sublimation
(d) Electroplating

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]
43. ‘’ K ‘’ has ………… atom number
(a) 18
(b) 19
(c) 22
(d) 11
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
45. Gold is a yellow soft ………….
(a) Alloy
(b) Solid
(c) Metal
(d) Crystal

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
46. The ionic size of calcium is
(a) 186,102 pm
(b) 160,72 pm
(c) 197,99 pm
(d) 170,81 pm
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

(b) Electro positivity
(c) Allotropy

(d) Ionization

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
48. The element in a group 2 are called
(a) Alkali
(b) Metal
(c) Alkaline earth
(d) Alloy

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
49. Alkali metal does not react with ………… directly
(a) Hydrogen
(b) Carbon
(c) calcium
(d)Nitrogen

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
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
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]
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
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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
[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

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
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

(b) Zero

(c) 14

(d) -14
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

59. Ore of Aluminium:
(a) Calamine
(b) Dolomite
(c) Bauxite
(d) Limestone
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

62. Brass is an alloy of:
(a) Cu and Zn
(b) Cu, Ni, Zn
(c) Cu and Ni
(d) Cu, Al, Zn
[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]

63. Urea is a high-quality nitrogenous fertilizer with:
(a) 76% nitrogen
(b) 46% nitrogen
(c) 66% nitrogen
(d) 26% nitrogen
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

64. Diamond is:

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

67. Calcium Carbide reacts with water to give:
(a) Methane
(b) Ethylene
(c) Acetylene
(d) Ethane
[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

68. Which of the following substituents deactivates the benzene ring and is o, p-directing?
(a) __ NH2
(b) __ Cl
(c) __ OCH3
(d) __ OH
[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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.

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]
87. The antifreeze compound ethylene glycol has the formula:
(a) C2H5OH
(b) CH3OH
(c) C2H4(OH)2
(d) C3H5(OH)3

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
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.

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
89. Which functional group is present in polyester shirts?
(a) Lactam
(b) Acid Chloride
(c) Ether
(d) Ester

[toggle title=”View Answer” state=”close”]Answer: Option D[/toggle]
90. Which one of the following is used as an Antibiotic?
(a) Patulin
(b) Insulin
(c) Soserine
(d) Trypsin

[toggle title=”View Answer” state=”close”]Answer: Option A[/toggle]
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.

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]
92. Which one of the following can be synthesized from Aryl Diazonium Salt?
(a) Furfural
(b) Carbylamine
(c) Biphenyl
(d) THF

[toggle title=”View Answer” state=”close”]Answer: Option B[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]

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

[toggle title=”View Answer” state=”close”]Answer: Option C[/toggle]