Chemistry MCQs:

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― C. JoyBell C.

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।

# 81. Which one of the following is a strong electrolyte?

A.

Nitrous acid (HNO2)

B.

Water (H2O)

C.

Trimethylamine [(CH3)3N]

D.

Potassium fluoride (KF)

# 82. Which of the following is a molecular crystal?

A.

Prism

B.

Dry ice

C.

Diamond

D.

Salt

# 83. Which of the following gases is green in color?

A.

Hydrogen gas (H2)

B.

Chlorine gas (Cl2)

C.

Methane (CH4)

D.

Nitrogen gas (N2)

# 84. Which of the following is not a physical change?

A.

Oxidation

B.

Decantation

C.

Precipitation

D.

Distillation

# 85. The allotrope of carbon is_____________.

A.

Glass

B.

Plastic

C.

Diamond

D.

Stainless steel

# 86. Which of the following is the best difinition of rate of reaction?

A.

The rate at which all the reactants are used up.

B.

The increase in the concentration of product per unit time.

C.

The time it takes for one of the reactant to be used up.

D.

The time it takes to use up all the reactants.

# 87. Which of the following is a chemical change?

A.

Dissolving of salt in water

B.

Boiling of water

C.

Freezing of water

D.

Rusting of iron

# 88. Stainless steel is a mixture (alloy) of_________.

A.

Carbon, Iron, Nickel and Chromium

B.

silver, Iron, Nickel and Mercury

C.

Carbon, Lead, Nickel and Chromium

D.

Carbon, Iron, Nickel and Zinc

# 89. What is the fundamental unit of matter called?

A.

Molecule

B.

Atom

C.

Mole

D.

Neuclius

# 10. Which statement is not correct for neutrons?

A.

Neutron is a subatomic particle of about the same mass as a proton.

B.

Neutron is present in all atomic nuclei except ordinary hydrogen.

C.

Neutron has a negative charge

D.

Neutrons are too small to see.

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