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 $X{Y}_2$

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)
• B. (I) and (III)
• C. (I), (III) and (IV)
• D. (II) and (IV)

Answer 1

The correct option is D

(II) and (IV)

X = Mg

Y = Cl

Z = $MgC{l}_2\left(X{Y}_2\right)$

$MgC{l}_2$ is an ionic compound & it conduct electricity in the molten state.