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Standard XII

Chemistry

Charge and Current

4.5 g of Alum...

Question

4.5 g of Aluminium (atomic mass 27 amu) is deposited at the cathode from a $A l^{3 +}$ solution by a certain amount of charge. The volume of hydrogen produced at STP from $H^{+}$ ions in solution by the same amount charge will be:

44.8 L

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22.4 L

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11.2 L

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5.6 L

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Solution

The correct option is D 5.6 L
The number of equivalents of $A l$ deposited $= \frac{4.5}{9} = 0.5$
The volume of $H_{2}$ gas at STP = number of equivalents $\times$ equivalent volume
$= 0.5 \times 11.2 = 5.6 L$

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4.5 g of Aluminium (atomic mass 27 amu) is deposited at the cathode from a Al3+ solution by a certain amount of charge. The volume of hydrogen produced at STP from H+ ions in solution by the same amount charge will be:

The correct option is D 5.6 LThe number of equivalents of Al deposited =4.59=0.5 The volume of H2 gas at STP = number of equivalents × equivalent volume =0.5×11.2=5.6L

4.5 g of Aluminium (atomic mass 27 amu) is deposited at the cathode from a $A l^{3 +}$ solution by a certain amount of charge. The volume of hydrogen produced at STP from $H^{+}$ ions in solution by the same amount charge will be:

The correct option is D 5.6 L
The number of equivalents of $A l$ deposited $= \frac{4.5}{9} = 0.5$
The volume of $H_{2}$ gas at STP = number of equivalents $\times$ equivalent volume
$= 0.5 \times 11.2 = 5.6 L$