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JEE Main Chemistry question

ChemistryElectrochemistryJEE Main

Salts of (atomic weight 7), (atomic weight 27) and (atomic weight 48) were electrolysed under identical conditions using the same quantity of electricity. When 2.1 g of was deposited, the weights of and deposited were 2.7 g and 7.2 g. The valencies of , and respectively are

Answer: (B)

Solution

Equal equivalents are deposited: $==

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Question ID VK-144042