IGCSE O Level Chemistry MCQs – Mock Test 154

Valency and Chemical Formula MCQs with Answers PDF Download – Test 154

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Valency & Chemical Formula MCQ – Mock Test 154 PDF Download

MCQ 766: The chemical formula of butane is:

CH₄
C₂H₄
C₃H₈
C₄H₁₀

MCQ 767: Evaporation of solution of CuSO₄ helps in:

making it concentrated only
crystallization of CuSO₄ only
evaporation of salt CuSO₄
making it concentrated and crystallization of CuSO₄

MCQ 768: What is true about distilled water?

it has some impurities left in it
it is very pure water
it is obtained through fractional distillation
it is obtained through decanting

MCQ 769: The valency of Sulphide is:

+1
+2
-1
-2

MCQ 770: What is true about crystals?

it is a solid that can be dissolved in liquids
it is a solid that re appears from other substances
it is a solid that reappears from the solution
it can be obtained through sublimation

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