Search SchoolNGR

Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 31:

Water gas is a mixture of

SchoolNGR Classroom

A CO_{2 and H[sub]2}[/sub]
B CO and H₂O
C CO₂ and CO
D CO and N₂
E CO and H₂

View Answer & Explanation

Question 32:

Which of the following metals cannot extracted from its ore by using carbon (ll) oxide as the reducing agent?

SchoolNGR Classroom

A Cu
B Zn
C Al
D Pb
E Fe

View Answer & Explanation

Question 33:

Which of the following is not a naturally occurring iron ore?

SchoolNGR Classroom

A FeCl₂
B Fe₂O₃O₃
C Fe₂O₃
D FeCO₃
E FeS₂

View Answer & Explanation

Question 34:

Which of the following equations represents the reaction of chlorine with hot concentrated sodium hydroxide solution?

SchoolNGR Classroom

A 2KOH+CI₂ â†’ KCIO + KCI + H₂O
B 4KOH + 2CI → 4KCI + 2H₂O + O₂
C 6KOH + 3CI₂ â†’ KCIO₃ + 5KCI + 3H₂O
D 2KOH + CI₂ â†’ 2KCI + H₂O₂
E KOH + 2CI₂ + H₂O â†’ KCI + 3HCI + O₂

View Answer & Explanation

Question 35:

Aqueous sodium trioxocarbonate (IV) solution is alkaline because

SchoolNGR Classroom

A Acid from which it is formed is strong
B Sodium is an alkali metal
C Sodium trioxocarbonate (IV) is decomposed by water
D Sodium trioxocarbonate (lV) is stable to heat
E Sodium triocarbonate (IV) is hydrolysed in water

View Answer & Explanation

Stay Updated

Follow us on:

Subjects