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     EduGorilla 
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    Salts of metals X, Y and Z are electrolysed under identical conditions using the same quantity of electricity. It was observed that 4.2 g of X, 5.4 g of Y and 19.2 g of Z were deposited at respective cathodes. If the atomic weights of X, Y and Z respectively are 7, 27 and 64, then the ratio of their valencies is

    Options :-

    1. 1 : 2 : 3
    2. 1 : 3 : 2
    3. 2 : 3 : 1
    4. 3 : 2 : 2
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