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Question

An element X (Atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z. Which of the following statements are true regarding this compound?
I. Molecular formula of Z is XY2.
II. It is soluble in water.
III. X and Y are joined by sharing of electrons.
IV. It would conduct electricity in the molten state.

A
(II) and (III)
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B
(I) and (III)
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C
(I), (III) and (IV)
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D
(I), (II) and (IV)
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Solution

The correct option is D (I), (II) and (IV)
An element X (atomic number 12) is Mg and another element Y (atomic number 17) is Cl. and the compound formed is MgCl2 [Z].

Mg+Cl2MgCl2

I. Molecular formula of Z is MgCl2 which is XY2 type.

II. MgCl2 is soluble in water because it is an ionic solid so it will dissolve only in a polar solvent like water.

III. Mg and Cl2 are joined by the transfer of electrons from magnesium to chlorine.

IV. MgCl2 conduct electricity in the molten state because it is an ionic compound means it is made of ions and when it is melted the ions move apart and become charge carriers,

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