Chemistry MCQs:

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"First they ignore you, then they ridicule you, then they fight you, and then you win."

― Mahatma Gandhi

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।

#: 11. Which of the following correctly represents the balanced chemical reaction between aluminum and sulfur?

A.

4 Al + S8 = 4 AlS2

B.

8 Al + S8 = 8 AlS

C.

12 Al + S8 = 4 Al3S2

D.

16 Al + 3 S8 = 8 Al2S3

#: 12. Which of the following is the heaviest metal?

A.

Diamond

B.

Mercury

C.

Iron

D.

Gold

#: 13. Which of the following represents the correct formula for bleaching powder?

A.

Ca(HCO3)2

B.

CaCO3

C.

Ca(ClO)2

D.

CaCl2

#: 14. Which of the following correctly represents the balanced chemical reaction between sulfuric acid and sodium hydroxide?

A.

2 H2SO4 + 2 NaOH = 2 Na2SO4 + 2 H2O + O2

B.

2 H2SO4 + NaOH = Na2SO4 + 2 H2O

C.

H2SO4 + NaOH = NaSO4 + H2O

D.

H2SO4 + 2 NaOH = Na2SO4 + 2 H2O

#: 15. What mainly is Radon(Symble=Rn, Atomic number=86)?

A.

One kind of Pigment

B.

Artificial Glass

C.

Nobel Gas

D.

Radiation of Light

#: 16. which of the following represents a hydronium ion?

A.

H2O+

B.

H3O+

C.

H4O+

D.

H5O+

#: 17. Which of the following gases would be most soluble in water?

A.

N2

B.

CH4

C.

NH3

D.

CO2

#: 18. The number of units in one mole of any substance, equal to 6.022140857 × 1023 is called________.

A.

Charles' number

B.

Scalar number

C.

Avogadro's number

D.

Boyle's

#: 19. Who invented the modern version of the atomic theory?

A.

John Dalton

B.

Isaac Newton

C.

Ernest Rutherford

D.

Albert Einstein

#: 20. What does the 'n' stand for in PV=nRT?

A.

The amount of substance of gas

B.

The number of neutron of gas

C.

The atomic number of gas

D.

All the above

1 2 3 4 5 6 7 8 9

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