Class 10

Periodic Classification of Elements question bank (Science)

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Q1.

What were the limitations of Newlands' Law of Octaves?

(A)
It was applicable only up to calcium.
(B)
It did not account for newly discovered elements.
(C)
It placed dissimilar elements in the same group.
(D)
All of the above.
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Q2.

Use Mendeleev's Periodic Table to predict the formulae for the oxides of the following elements: $K, C, Al, Si, Ba$.

(A)
$K_2O, CO_2, Al_2O_3, SiO_2, BaO$
(B)
$K_2O, CO, Al_2O_3, SiO, BaO_2$
(C)
$KO, CO_2, AlO_3, Si_2O_4, Ba_2O$
(D)
$K_2O_2, C_2O, Al_3O_2, SiO_2, BaO_2$
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