Question

Give reasons for the following:
MgCl2 is soluble in water but insoluble in acetone, while methane is insoluble in water, but soluble in acetone.

  • Chemical Bonding
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Answer

MgCl2 is a electrovalent compound, so it is soluble in water (as water is a polar solvent and has a high dielectric constant) and insoluble in organic solvents like acetone (as organic solvents are non-polar and have low dielectric constant and do not cause dissolution).

Methane is a covalent compound and is insoluble in polar solvents like water and dissolve in organic (non-polar) solvents like acetone.

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Chemical Bonding

Fill in the blanks with the correct word from the brackets:
(i) The bond between two elements in group 17[VIIA] of the periodic table is likely to be ____ [ionic/covalent].
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(v) For formation of an electrovalent bond between elements ‘X’ and ‘Y’ which are a metal and non-metal respectively, X should have a ____ [high/low] ionization potential and ‘Y’ a ____ [high/low] electron affinity.

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