Chemistry MCQs:

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"You will never be happy if you continue to search for what happiness consists of. You will never live if you are looking for the meaning of life."

― Albert Camus

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।

#: 61. Of the following name/symbol combinations of elements, which one is wrong?

A.

Argon/Ag

B.

Potassium/K

C.

Lithium/Li

D.

Gold/Au

#: 62. Which atom has an electronic configuration of 2, 6

A.

Carbon (C)

B.

Nitrogen (N)

C.

Oxigen (O)

D.

Sulfur (S)

#: 63. The sum of the number of protons and neutrons of an atomic nucleus is called_________.

A.

atomic number

B.

mass number

C.

avogadro's number

D.

median number

#: 64. Which one of the following salts is insoluble?

A.

Sodium salfide (Na2S)

B.

Ammonium chloride (NH4Cl)

C.

Zinc acetate [Zn(CH3COO)2]

D.

Barium carbonate BaCO3

#: 65. The hottest part of the gas flame is commonly known as___________.

A.

yellow zone

B.

radish zone

C.

non-luminous zone

D.

luminous zone

#: 66. What is the oxidation number of sulfur (S) in H2SO4?

A.

+8

B.

+6

C.

-8

D.

-6

#: 67. Which of the following metals has the chemical symbol Pb?

A.

Iron

B.

Barium

C.

Platinum

D.

Lead

#: 68. What was the first man made chemical element?

A.

Technetium (Tc)

B.

Bohrium (Bh)

C.

Rutherfordium (Rf)

D.

Fermium (Fm)

#: 69. A real gas most closely approaches the behavior of an ideal gas under conditions of

A.

high pressure and low temperature

B.

high pressure and high temperature

C.

high temperature and low pressure

D.

low pressure and low temperature

#: 70. What is the oxidation number for carbon (C) in CaC2O4?

B.

+1

C.

+2

D.

+3

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