EN value for four elements A, B, C and D are respectively 2.7, 2.1,0.8 and 3.4. select incorrect statement based on given above data.

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Compound AB conducts electricity only in fused state

Compound BD conducts electricity only in solution state.

Compound CD conducts electricity in fused as well in solution state

AD does not conduct electricity in solid and fused state.

answer is A.

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Detailed Solution

Correct ( 1 )EN difference between AB = 2.7 - 2.1 = 0.6 compound AB is pure covalent. Does not conduct electricity in fused state.EN difference between BD = 2.1 - 0.8 = 1.3. value is < 1.7. ionic character is less than 50% and covalent character is > 50%so it conducts electricity only in solution state.EN difference between CD = 3.4 - 0.8 = 2.6 value is >1.7 ionic character is more than 50% hence conduct electricity in both fused and in solution state.EN difference between AD = 3.4 - 2.7 = 0.6 compound AD is more than 50% covalent thus does not conduct electricity in both solid and fused state.

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