question_answer

16.8 litre gas containing \[{{H}_{2}}\] and \[{{O}_{2}}\]is formed at NTP on electrolysis of water. What should be the weight of electrolysed water

A)                 5 g          

B)                 9 g

C)                 10 g       

D)                 12 g

Correct Answer: B

Solution :

           n \[=\frac{16.8}{22.4}=0.75\]mole of \[{{H}_{2}}\]and \[{{O}_{2}}\]                    \[2{{H}_{2}}O\to \underset{2:1}{\mathop{2{{H}_{2}}+{{O}_{2}}}}\,\]                    2 mole \[{{H}_{2}}\] ? 2 mole\[{{H}_{2}}O\]                                 0.5 mole\[{{H}_{2}}\] ­? 0.5 mole \[{{H}_{2}}O\]= 9gm.