IGCSE O Level Chemistry Practice Test 73

pH Scale: Acid and Alkali Quiz Questions and Answers PDF - 73

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pH Scale: Acid & Alkali Questions and Answers PDF Download: Quiz 73

MCQ 361: Toothpaste has an average pH of

A) 0

B) 4

C) 8

D) 12

MCQ 362: Consider the equation PbO + NaOH + H₂O → Na₂Pb(OH)₄. The balancing of the equation requires how much moles of NaOH?

A) 1

B) 2

C) 3

D) 4

MCQ 363: In the fractionating column of fractional distillation, as we go higher in the column the

A) temperature becomes lower

B) temperature becomes higher

C) minimum absorption is carried out

D) risks of sublimation exists

MCQ 364: After centrifugation when the sublimate settles, the clear liquid can be

A) allowed to rest

B) allowed to form crystals

C) decanted off

D) evaporated

MCQ 365: While Iodide ion (I^-) oxidizes to Iodine (I₂), a change in color from colorless to

A) brown occurs

B) pink occurs

C) blue occurs

D) violet occurs

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