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Standard XII

Chemistry

Properties of Solids

A white subst...

Question

A white substance melts and decomposes at $730^{\circ} C$ . As a solid, it is a non-conductor of electricity but it dissolves in water to form a conducting solution. The white substance is a/an:

Covalent network solid

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Ionic solid

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Molecular solid

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Metallic solid

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Solution

The correct option is B Ionic solid
Ionic solids have high melting and boiling points. They do not conduct electricity in solid state because of the strong electrostatic force between the ions, however they can conduct in their molten state and also when dissolved in water.

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Similar questions

Q. A white substance melts and decomposes at

730^{\circ} C

. As a solid, it is a non-conductor of electricity but it dissolves in water to form a conducting solution. The white substance is a/an:

Q. Solid

C O_{2}

is an example of

Q. Two substance

X

and

Y

are dissolved in water under suitable conditions.

X

is a gas while Y is a solid under normal conditions. The 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 steps given below in a sequence.
(a)

Y

is a solid at room temperature and its aqueous solution conducts electricity. This show 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 non-polar 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 most of the non-polar covalent molecules are gases or solids at room temperature. Polar covalent compounds are liquids or gases.

(1) DEFINE THESE IN SHORT

A. CRYSTALLINE SOLID

B. AMOROPHOUS SOLID

C. MOLECULAR SOLID

D. IONIC SOLID

E. METALLIC SOLID

F. COVALENT OR NETWORK SOLID

G. CRYSTAL LATTICE

H. BRAVAIS LATTICE

I. PRIMITIVE UNIT CELL

J. CENTERED UNIT CELL

K. BODY CENTERED UNIT CELL

L. FACE CENTERED UNIT CELL

M. END CENTERED UNIT CELL

Q. The white solid compound A decomposes quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained along with potassium nitrate solution. Gas C does not burn itself but helps to burn other things.

What do you think that black substance X and What is its function?

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A white substance melts and decomposes at 730∘ C. As a solid, it is a non-conductor of electricity but it dissolves in water to form a conducting solution. The white substance is a/an:

The correct option is B Ionic solidIonic solids have high melting and boiling points. They do not conduct electricity in solid state because of the strong electrostatic force between the ions, however they can conduct in their molten state and also when dissolved in water.

A white substance melts and decomposes at $730^{\circ} C$ . As a solid, it is a non-conductor of electricity but it dissolves in water to form a conducting solution. The white substance is a/an:

The correct option is B Ionic solid
Ionic solids have high melting and boiling points. They do not conduct electricity in solid state because of the strong electrostatic force between the ions, however they can conduct in their molten state and also when dissolved in water.