Q20 / 95 · NTA Abhyas (JEE Main) 2020 · Chemistry · s Block Elements

A metal on combustion in excess air forms X. X upon hydrolysis with water yields $H_{2} O_{2}$ and $O_{2}$ along with another product the metal is

A
Li
B
Na
Correct answer
C
Rb
D
Mg

Solution

It is Rb and the reactions are as follows

R b + O_{2} \to \underset{' X'}{R b O_{2}}

2 R b O_{2} + 2 H_{2} O \to 2 R b O H + H_{2} O_{2} + O_{2}

Hence, the correct answer is option: 'C'.

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