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?
1. Molecular formula of Z is XY2.
2. It is soluble in water.
3. X and Y are joined by sharing of electrons.
4. It would conduct electricity in the molten state.
(a) 2 and 3
(b) 1 and 3
(c) 1, 3 and 4
(d) 1 and 4
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Explanation:
An element X (atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z.
From their atomic numbers it's crystal clear that element X is Magnesium having formula Mg of atomic number 12 and element Y having atomic number 17 is Chlorine having formula Cl.
→ X = Mg
→ Y = Cl
Mg + Cl2 → MgCl2 or X + Y2 → XY2
Molecular formula of Z is XY2
The compound MgCl2 or XY2 is an ionic compound and it conduct electricity in the molten state.
Statement (1) (2) and (4) are correct.
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