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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 351:

Which of the following species is always present in acidified water?

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A NH⁺₄
B O ^2-
C HCI
D H³O⁺
E HNO₃

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Question 352:

The most suitable method for preparing lead (ll) chloride is by

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A Action of dilute HCI on PbSO ₄
B Acts of dilute HCI on lead
C Action of dilute HCI on PbCO₃
D Bubbling chlorine into a solution of Pb(NO₃)₂
E Mixing aqueous solutions Pb(NO₃)₂ and NaCI.

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Question 353:

A positive brown ring test indicates the presence of

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A NO ₃
B Fe ³⁺
C SO ^2-₃
D CU⁺
E NO^-₂

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Question 354:

Consider the reaction represented by the equation below: XO + YO â†’ X + YO₂ In the reaction, YO acts as

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A An acidic oxide
B A basic oxide
C A reducing agent
D A weak base
E An oxidizing agent

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Question 355:

Alums are classified as

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A Simple salt
B Acid salts
C Anhydrous salts
D Double salts
E Basic salts

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