Chemistry MCQs:

"Confidence is ignorance. If you're feeling cocky, it's because there's something you don't know."

― Eoin Colfer

Science-Chemistry-Multiple Choise Questions and 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।

# 71. Which one of the following is the most electronegative element?

A.

Chlorine (Cl)

B.

Fluorine (F)

C.

Bromine (Br)

D.

Sulfur (S)

# 72. Which solution will change red litmus to blue of the following?

A.

Hydrochloric acid (HCl)

B.

Sodium chloride (NaCl)

C.

Methanol (CH3OH)

D.

Sodium hydroxide (NaOH)

# 73. Which of the following materials is the most recycleable?

A.

Silver (Ag)

B.

Aluminium (Al)

C.

Lead (Pb)

D.

Iron (Fe)

# 74. Which one of the following prossesses is the gratest acid strengh in water?

A.

Perchloric acid (HClO4)

B.

Hypobromous acid (HBrO)

C.

Hypochlorous acid (HClO)

D.

Carbonic acid (H2CO3)

# 75. When a gas changes into a liquid it is called____________.

A.

melting

B.

sublimination

C.

condensation

D.

polymerization

# 76. Which of the following statements about nitrogen gas (N2) is false?

A.

nitrogen gas makes up about 78% of the atmosphere by volume.

B.

It is a colourless gas with a characteristic pungent smell.

C.

It is used to make ammonia.

D.

nitrogen gas is used to make fertilizers

# 77. Mg2+ is isoelectronic with____________.

A.

Na+

B.

Cu2+

C.

Ca2+

D.

Zn2+

# 78. what is called that mineral containing both magnesium (Mg) and calcium (Ca)?

A.

dolomite

B.

calcite

C.

magnesite

D.

carnallite

# 79. Which compound gives photochemical smog a brownish color?

A.

Nitrous acid (HNO2)

B.

Nitric oxide (NO)

C.

Nitrogen dioxide (NO2)

D.

Dinitrogen trioxide (N2O3))

# 80. When solids reach their melting points they become____________.

A.

hot

B.

liquid

C.

cool

D.

hard

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