Chemistry MCQs:

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"But better to get hurt by the truth than comforted with a lie."

― Khaled Hosseini

Science-Chemistry-Multiple Choise Questions & Answers

প্রতিটি প্রশ্নের জন্য চারটি করে উত্তর থাকবে যার একটি সঠিক, বামদিকে A, B, C এবং D এর উপর ক্লিক করে সঠিক উত্তরটি দেখতে পারেন। যদি উত্তর সঠিক হয় তবে অপশনটির ডান দিকে টিক () আর উত্তর ভূল হলে ক্রস () চিনহ প্রদ্ররশিত হবে।

#: 51. The reaction, 2Fe + 3Cl2 = 2FeCl3, is an example of which type of reaction?

A.

Disproportionation reaction

B.

Respiration reaction

C.

Acid/Base reaction

D.

Combination reaction

#: 52. The reaction does not take place in the dark but take place only in the presence of light or other radiation is called___________.

A.

Disproportionation reaction

B.

Combustion reaction

C.

Photochemical reaction

D.

Synthesis reaction

#: 53. Which of the following is commonly known as rust?

A.

Iron chloride (FeCl3)

B.

Iron oxide (Fe2O3)

C.

Iron nitrate [Fe(NO3)3]

D.

Iron hydroxide [Fe(OH)3]

#: 54. Which one of the following substances can be melted without breaking chemical bonds?

A.

Sulfur dioxide (SO2)

B.

zinc chloride (ZnCl2)

C.

Sodium sulfate (Na2SO4)

D.

Silicon dioxide (SiO2)

#: 55. Which of the following metal is extracted from sea water?

A.

Sodium (Na)

B.

Potassium (K)

C.

magnesium (Mg)

D.

Calcium (Ca)

#: 56. Which one of the following is a secondary alcohol?

A.

CH3CH2OH

B.

CH3CH(OH)CH3

C.

(CH)3C3OH

D.

CH3OH

#: 57. Which one of the following is the third most common gas found in the air we breathe?

A.

Helium gas (He)

B.

Nitrogen gas (N)

C.

Carbon dioxide gas(CO2)

D.

Argon gas (Ar)

#: 58. How many electrons does sodium have?

A.

11

B.

22

C.

33

D.

44

#: 59. What is the centre of an atom called?

A.

Electron

B.

Proton

C.

Nucleus

D.

Neutron

#: 60. Which of the following has 12 electrons?

A.

Magnesium (Mg)

B.

Lithium (Li)

C.

Aluminium (Al)

D.

Sodium (Na)

1 2 3 4 5 6 7 8 9

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