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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 36:

Aluminium hydroxide is used in the dyeing industry as a

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A Salt
B Dye
C Mordant
D Dispersant

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Question 37:

Alloys are best prepared by

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A Electroplating
B Arc-welding
C Reducing and mixture of their metallic oxide
D Cooling a molten mixture of the metals

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Question 38:

Transition metals possess variable oxidation states because they have

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A Electrons in the d orbitals
B Electron in the s orbitals
C A variable number of electrons in the p orbitals
D Partially filled p orbitals

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Question 39:

Sodium metal is always kept under oil because it

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A Readily reacts with water
B Is reduced by atmospheric nitrogen
C Reacts vigorously on exposure to air
D Reacts with oxygen and carbon (IV) oxide

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Question 40:

Oxyacetylene flame is used for iron-welding because it

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A Makes the iron metals solidify very quickly
B Combines with oxygen to give a pop sound
C Evolves a lot of heat when burnt
D Dissociates to produce carbon (IV) oxide and oxygen

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