IGCSE O Level Chemistry Practice Test 154

Valency and Chemical Formula MCQ (Multiple Choice Questions) PDF - 154

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Valency & Chemical Formula Questions and Answers PDF Download: Quiz 154

MCQ 766: The chemical formula of butane is

A) CH₄

B) C₂H₄

C) C₃H₈

D) C₄H₁₀

MCQ 767: Evaporation of solution of CuSO₄ helps in

A) making it concentrated only

B) crystallization of CuSO₄ only

C) evaporation of salt CuSO₄

D) making it concentrated and crystallization of CuSO₄

MCQ 768: What is true about distilled water?

A) it has some impurities left in it

B) it is very pure water

C) it is obtained through fractional distillation

D) it is obtained through decanting

MCQ 769: The valency of Sulphide is

A) +1

B) +2

C) -1

D) -2

MCQ 770: What is true about crystals?

A) it is a solid that can be dissolved in liquids

B) it is a solid that re appears from other substances

C) it is a solid that reappears from the solution

D) it can be obtained through sublimation

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