CHEMISTRY IMPORTANT MCQ'S

1. The difference between ammonia and ammonium is ?

Correct Answer is: a proton

2. The most active non-metallic element is ?

Correct Answer is: fluorine

3. The order of decreasing activity of the halogen is ?

Correct Answer is: F, Cl, Br, I

4. Which of the following process is used to prepare ammonia commercially, ?

Correct Answer is: haber process

5. Which of the following is observed when ammonium chloride is heated with calcium hydroxide?

Correct Answer is: odour of NH3

6. Which of the following is formed when carbon dioxide gas is bubbled into line water?

Correct Answer is: CaCO3

7. Which of the following usually forms four covalent bonbs by sharing of electrons?

Correct Answer is: C

8. Which of the following is functional group of alcohol?

Correct Answer is: -OH

9. The first member of alkyne series is ?

Correct Answer is: ethyne

10. The number of electron of an atom having atomic number 17 is ?

Correct Answer is: 17

11. Which of the following substance act as a catalyst in the given chemical change? PClO3 + Q → PCl + O2(g) + Q

Correct Answer is: Q

12. The Correct formula of calcium hydrogen sulphate is ?

Correct Answer is: Ca(HSO4)2

13. Ammonia gas can be collected in a gas jar by ?

Correct Answer is: the downward displacement of air.

14. Which of the following in used as a fire extinguisher?

Correct Answer is: CO2

15. Which of the following in organic compound?

Correct Answer is: CCl4

16. Which of the following general formula represent alcohol?

Correct Answer is: CnH2n+1.OH

17. Word "Eth" represent, ?

Correct Answer is: Word root

18. –Ol is secondary suffix of ?

Correct Answer is: Alcohol

19. Which of the following is not ore of iron?

Correct Answer is: Bauxite

20. Which of the following metallurgical process not describe the refining?

Correct Answer is: both (a) and (b)

21. Following character represent the metals ?

Correct Answer is: all of the above

22. The electronic configuration 1s22s22p63s23p64s23d6 represent ?

Correct Answer is: iron

23. Atoms constituting atomic number 58-71 represent. ?

Correct Answer is: f- block element

24. "O" – group element represent ?

Correct Answer is: noble gases

25. The IUPAC name of the following organic compound is, CH3 – CH(Cl) – CH2 – CH2 - OH ?

Correct Answer is: 3-Chloro-butan-1 – ol

26. The smallest particle that takes part in a chemical change is ?

Correct Answer is: atom

27. A chemical substance which cannot be divided is ?

Correct Answer is: element

28. Which of the following is an element?

Correct Answer is: quick silver

29. Which of the following contains only one element?

Correct Answer is: graphite

30. Which of the following phrases would be incorrect to use?

Correct Answer is: an atom of a compound

31. Divide a piece of chalk into half. Divide it further and keep on dividing it many times. The smallest piece of chalk that can be obtained by this division is ?

Correct Answer is: a molecule

32. Which of the following is not a diatomic molecule?

Correct Answer is: phosphorus

33. Which of the following methods can be used to obtain pure water from a solution of salt in water?

Correct Answer is: distillation

34. Iron can be separated from non magnetic waste material by a technique called ?

Correct Answer is: magnetic separation

35. Crude petroleum, gasoline, kerosene and diesel can be separated by a technique called ?

Correct Answer is: fractional distillation

36. Camphor, sodium chloride and sand can be separated by ?

Correct Answer is: Sublimation followed by dissolution and filtration

37. The liquid metal is ?

Correct Answer is: Hg

38. The liquid non metallic element is ?

Correct Answer is: Br

39. Chemical formula of a particular compound reflects ?

Correct Answer is: number of different types of atoms in a molecule

40. Chemical reaction involves ?

Correct Answer is: Electrons

41. A balanced chemical equation represents ?

Correct Answer is: equal number of atoms on both sides

42. The composition of bronze is ?

Correct Answer is: Cu + Sn

43. The composition of german silver is ?

Correct Answer is: Cu+ Zn+ Ni

44. The non metallic electropositive radical is ?

Correct Answer is: NH4 +

45. The formula of lunar caustic is ?

Correct Answer is: AgNO3

46. Which one of the following metal is also known as white gold?

Correct Answer is: Pt

47. The rate of reaction doesn’t depends on ?

Correct Answer is: concentration of product

48. The factor which doesn’t influence the rate of reaction is ?

Correct Answer is: molecularity

49. Higher the value of activation energy, -------- would be the reaction rate. ?

Correct Answer is: slow

50. The rate of a chemical reaction ?

Correct Answer is: decreases as the reaction proceeds

51. According to Arrhenius acid, acids are ?

Correct Answer is: compounds which give hydrogen ion

52. Arrhenius theory of acid –base is not applicable in ?

Correct Answer is: non aqueous solution

53. The solution which gives H3O+ ion in aqueous solution is ?

Correct Answer is: acid

54. According to Arrhenius theory, CO2 cannot be considered as ?

Correct Answer is: acid

55. HCl does not behave as acid in ?

Correct Answer is: C6H6

56. According to Bronsted- Lowry concept, a base is a substance which acts as ?

Correct Answer is: a proton acceptor

57. Which is Bronsted- Lowry acid?

Correct Answer is: H3O+

58. According to Bronsted- Lowry concept, the following are formed in the neutralization reaction. ?

Correct Answer is: conjugate acid –base pair

59. According to Bronsted- Lowry concept, water is ?

Correct Answer is: both acid and base

60. Which of the following does not act as Bronsted acid?

Correct Answer is: CH3COO-

61. According to Lewis concept, an acid is a substance which ?

Correct Answer is: accepts a lone pair of electron

62. BF3 is an acid according to ?

Correct Answer is: lewis

63. According to Lewis concept, which one of the following is not a base?

Correct Answer is: Ag+

64. pH of a solution is defined as ?

Correct Answer is: –Log[ H+ ] ion concentration

65. The pH of 10-3M HCl is nearly equal to ?

Correct Answer is: 3

66. The pH of a solution is 9.5. It is ?

Correct Answer is: basic

67. A solution of pH 3 as compared to a solution of pH 6 is ?

Correct Answer is: more acidic

68. A solution of pH 9.0 is one thousand times as basic as a solution of pH ?

Correct Answer is: 6

69. Phenolphthalein indicator shows pink colour in ?

Correct Answer is: alkaline solution

70. Methyl orange indicator shows red colour in ?

Correct Answer is: acidic solution

71. Blue litmus paper turns into red in ?

Correct Answer is: acidic solution

72. Red litmus paper turns into blue in ?

Correct Answer is: alkaline solution

73. No effect is seen on blue litmus paper when it is dipped into ?

Correct Answer is: alkaline solution

74. The diameter of an atom is in the order of ?

Correct Answer is: 0.2nm

75. Which of the following are isoelectronic species?

Correct Answer is: F- Ne Na+

76. The mass spectrometer is used to determine the Mass number of isotopes and ?

Correct Answer is: Relative abundance

77. Molecular ions are formed by passing ?

Correct Answer is: All of the above

78. The number of peaks obtained in mass spectrometry shows ?

Correct Answer is: Number of isotopes

79. The empirical formula of chloroform is ?

Correct Answer is: CHC13

80. Which one is true about isotope?

Correct Answer is: Same chemical properties

81. The molecular mass of water (18g) means ?

Correct Answer is: all

82. Which of the following ion formation is always exothermic?

Correct Answer is: Uni-negative

83. Which of the following statements about isotopes is correct?

Correct Answer is: Isotopes with an even atomic number and even mass number are abundant

84. FOR THE COMPLETE PDF NOTE OF ALL ENTRANCE EXAM AFTER SEE CONTACT US ON OUR VIBER AND WHATS APP NUMBER : 9866014896 Or Our Facebook Page ?

Correct Answer is: Gyan Mark