oxide of metals reacts with coke to yield corresponding metal. (give reason)
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Explanation:
Two metal alkali oxides, namely sodium oxide (Na2O) and potassium oxide (K2O), are of particular importance in terms of the cement and concrete chemistry, as they can become involved in alkali–silica reaction (ASR), which can be harmful to concrete (see Section 3.6.6). The soluble alkalis in cement are usually expressed as sodium oxide equivalents (Na2Oeq), which are the sum of Na2O and 0.658 times K2O, tested in accordance with ASTM C114 (2015) and BS EN 196-2 (