4.5g of aluminum (at. mass 27amu) is deposited at cathode from Al3+ solution by

Question

4.5 g

of aluminum (at. mass 27amu) is deposited at cathode from

A l^{3 +}

solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from

H +

ions in solution by the same quantity of electric charge will be

Options:

A . 22.4 L

B . 44.8 L

C . 5.6 L

D . 11.2 L

Answer: Option C
:
C

E q o f A l = e q o f H_{2}

\frac{4.5}{\frac{27}{3}} = e q o f H_{2}; \frac{4.5}{9} = e q o f H_{2}

2 H^{+} + 2 e^{-} \to H_{2}

eq. of

H_{2}

= Number of moles

\times n

factor

0.5 = n_{H_{2}} \times 2

V_{H_{2}} = \frac{0.5}{2} \times 22.4; V_{H_{2}} = 5.6 L

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