29. Metals with Oxygen: think and answer

Exercise condition:

5 m.

1.

The metal that reacts with oxygen even at low temperature to form its oxide is

\(Mg\)
\(Pt\)
\(K\)
\(Au\)
\(Fe\)
\(Cu\)

2.

At low temperatures, an alkali metal, which is located before calcium in the periodic table, interacts with oxygen to form a product \(X\). \(X\) is further reacted with water to form the product \(Y\). Find \(X\) and \(Y\).

\(X\) is \(Na_2O\); \(Y\) is \(NaOH\)
\(X\) is \(K_2O\); \(Y\) is \(KOH\)
\(X\) is \(NaO_2\); \(Y\) is \(NaOH\)
\(X\) is \(Na_2O\); \(X\) does not react with water
\(X\) is \(K_2O\); \(X\) does not react with water

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