1978
When heat is absorbed during a chemical reaction, the reaction is said to be _______
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1978 UI Post UTME Chemistry Past Questions
1978
Which one of the following changes is physical?
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1978
The periodic classification of the elements is an arrangement of the elements in order of their
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1978
Elements P, Q, R, S, have 6, 11, 15 and 17 electrons respectively, therefore
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