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Chemistry Past Questions and Answers

Neco Chemistry Questions

Question 61:

Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass

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A Acquire certain colours
B Easier to melt
C Easier to mould
D Little brittle
E More transparent

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Question 62:

The pH of water is 7.

What is the pH of orange juice?

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A 7
B Above 10
C Below 2
D Between 5.5 and 6.5
E Between 7.5 and 8.5

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Question 63:

Chlorine displaces bromine from aqueous potassium bromide because ____________

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A Bromine is a liquid at room temperature
B Bromine is weakly acidic.
C Bromine has a greater atomic radius than chlorine
D Chlorine is a stronger oxidising agent than bromine.
E The density of chlorine is less than the density of bromine.

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Question 64:

What is the change in the oxidation number of phosphorus in the following reaction?

4P(s) + 5O₂(ag) → 2P₂O₅(s)

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A 0 to 2
B 0 to 5
C 4 to 2
D 4 to 5
E 4 to 10

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Question 65:

In the reaction 2H₂S(g) + SO₂(g) → 2H₂SO(I)+3S(s)SO₂is acting as ____________ agent

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A A bleaching
B A dehydrating
C An oxidizing
D A precipitating
E A reducing

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