Chemistry MCQs:

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"Be who you are and say what you feel, because those who mind don't matter, and those who matter don't mind."

― Bernard M. Baruch

Science>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।

#: 21. Which of the following represents the correct chemical formula for washing suda?

A.

Ca2CO3

B.

Na2CO3

C.

NaHCO3

D.

Ca(HCO3)2

#: 22. Which of the following is widely used in the food industry as a sweetener and humectant and in pharmaceutical formulations?

A.

Ethyl acetate (C4H8O2)

B.

methyl alcohol (CH3OH)

C.

Ethylene glycol (C2H6O2)

D.

Glycerol (C3H8O3)

#: 23. Which of the following represents the correct chemical formula for Vitamin E?

A.

C31H55O2

B.

C30H60O30

C.

C29H50O2

D.

C11H22O11

#: 24. Oil of vitriol is__________.

A.

Nitric acid (HNO3)

B.

Formic acid (CH2O2)

C.

Oxalic acid (C2H2O4)

D.

Sulfuric acid (H2SO4)

#: 25. What is atomic number of an atom?

A.

Number of neutrons

B.

Number of electrons

C.

Number of protons

D.

Total number of protons and neutrons

#: 26. How many neutrons does oxygen have in its nucleus?

C.

16

#: 27. Who first discovered the element Oxygen (O)?

A.

Carl Wilhelm Scheele and Antoine Lavoisier

B.

Henry Cavendish and Antoine Lavoisier

C.

Henry Cavendish and Joseph Priestley

D.

Carl Wilhelm Scheele and Joseph Priestley

#: 28. The atoms in a molecule are joined together by__________.

A.

Metallic bond

B.

Chemical bond

C.

Covalent bond

D.

Ionic bond

#: 29. What is the chemical name for honey?

A.

Fructose (C6H12O6)

B.

Lactose (C122211O2)

C.

Cellulose (C6H10O5)

D.

Glucose (C6H12O6)

#: 30. Which of the following is used to freeze food?

A.

Liquid Nitrogen

B.

Liquid Hydrogen

C.

Liquid air

D.

Liquid Bromine

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