CBSE Class 10 Science 2019 Delhi Set 1

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Question : 8
Total: 28
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each :
(i) Oxide of first group elements.
(ii) Halide of the elements of group thirteen, and
(iii) Compound formed when an element, A of group 2 combines with an element, B of group seventeen.
Solution:  
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