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Byju's Answer

Standard XII

Chemistry

Properties of Solids

A B and C are...

Question

A B and C are three substances.A does not conduct electricity in the solid or liquid state.B conducts electricity both in the fused and solution C conduct electricity in aqueous solution but not in liquid state.which of the following statements is false regarding A B and C

A) A has polar covalent linkage

B) a has nonpolar covalent linkage

C) B is ionic in nature

D) C has polar covalent linkage

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Solution

A polar covalent molecule may conduct electricity in liquid state due to formation of ions. For example HCl will dissociate a little in liquid state as under
HCl->H+ + Cl-
So as A does not conduct electricity in solid as well as liquid state it should be pure covalent So option A is wrong

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Similar questions

Q. Two substances

X

and

Y

are dissolved in water under suitable conditions.

X

is a gas while

Y

is a solid under normal conditions. Solution of

Y

is found to conduct electricity but not

X

. Based on the conclusion, identify the nature of bond present in

X

and

Y

with appropriate reasons as given below.

Arrange the step given below in a sequence:
(a)

Y

is a solid at room temperature and its aqueous solution conducts electricity. This shows that it is an ionic compound.
(b)

X

on dissolution in water doesn't conduct electricity and is a gas at room temperature. Hence it should be a nonpolar covalent molecule.
(c) Aqueous solutions of both ionic compounds and polar covalent compounds conduct electricity because of the presence of free ions.
(d) All ionic compounds are solids and more of the nonpolar covalent molecules are gases or solids at room temperature. Polar covalent compounds are liquids or gases.

A, B, C

are three substances.

A

does not conduct electricity in the solid, molten state and aqueous solution.

B

conducts electricity both in the fused and aqueous states, while

C

conducts electricity only in the aqueous state. In solid state neither

B

nor

C

conducts electricity. Which of the following statements is/are true regarding

A, B

and

C

Q. Assertion:

H C l

is a covalent compound but it conducts electricity in its aqueous state. Reason: In aqueous solution

H C l

ionises to

H^{+}

and

C l^{-}

ions which are responsible for electrical conductivity.

(a) Explain why ionic compounds conduct electricity in solution whereas covalent compounds do not conduct electricity.
(b) Which of the following will conduct electricity and which not?
$M g C l_{2}, C C l_{4}, N a C l, C S_{2}, N a_{2} S$
Give reasons for your choice.

S i O_{2}

is a covalent solid. Which of the following is most likely to be true regarding

S i O_{2}

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A polar covalent molecule may conduct electricity in liquid state due to formation of ions. For example HCl will dissociate a little in liquid state as under HCl->H+ + Cl- So as A does not conduct electricity in solid as well as liquid state it should be pure covalent So option A is wrong

A polar covalent molecule may conduct electricity in liquid state due to formation of ions. For example HCl will dissociate a little in liquid state as under
HCl->H+ + Cl-
So as A does not conduct electricity in solid as well as liquid state it should be pure covalent So option A is wrong