An element $X$ (atomic number $17$ ) reacts with an element $Y$ (atomic number $20$ ) to form a divalent halide. What will be the nature of oxide of element Y?

Basic

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Acidic

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Neutral

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None of these

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Solution

The correct option is A Basic
Y has 20 electrons, i.e., calcium. It must be in the 4th period and as it has to donate 2 electrons to get the stable configuration of [Ar]. It is calcium and it forms basic oxide.

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Question 43 (a)
A element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.

Where in the periodic table are elements X and Y placed?

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