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Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by ...
Classroom
Chemistry Classroom
Waec
Waec 1993
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Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of
SchoolNGR Classroom
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
A
Group lV elements
B
Group l metals
C
Transition metals
D
Alkaline earths
E
The halogens
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Show Explanation
Correct Answer:
Option C
Explanation:
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