Question

Name the gas released: 1. Zinc+Sulphuric acid

2. Manganese dioxide+ Hydrochloric acid

3. Sodium sulphide+Dilute sulphuric acid

4. Sodium carbonate+Hydrochloric acid

Answer 1

1) $Zn+H_{2}S{O}_4\to ZnS{O}_4+H_2\uparrow$
It can be seen from the above reaction that hydrogen gas is released.
2)
$Mn{O}_2+4HCl\to MnC{l}_2+C{l}_2\uparrow +2H_{2}O$
It can be seen from the above reaction that chlorine is released.
3)
$N{a}_{2}S+H_{2}S{O}_4\to N{a}_{2}S{O}_4+H_{2}S\uparrow$
It can be seen from the reaction that hydrogen sulfide gas is released.

4)
$N{a}_{2}C{O}_3+2HCl\to 2NaCl+C{O}_2\uparrow +H_{2}O$
It can be seen from the reaction that carbon dioxide is released.