Which of the following pairs of reactions give $H_2$ gas as a product upon hydrolysis?
- A$i$. $Ba \xrightarrow{H_2 O}$ Products; $ii$. $BaO_2 \xrightarrow{H_2 O}$ Products
- B$i$. $Ca \xrightarrow{H_2 O}$ Products; $ii$. $CaH_2 \xrightarrow{H_2 O}$ Products
- C$i$. $K \xrightarrow{H_2 O}$ Products; $ii$. $K_2 O \xrightarrow{H_2 O}$ Products
- D$i$. $Na \xrightarrow{H_2 O}$ Products; $ii$. $Na_2 O_2 \xrightarrow{H_2 O}$ Products
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