Electric Conduction of Ionic Compounds

Q.

Explain why a salt which does not conduct electricity in the solid state becomes a good conductor in a molten state.

Q.

In our NCERT book, a paragraph is written - Sodium and chloride ions, being oppositely charged, attract each other and are held by strong electrostatic forces of attraction to exist as sodium chloride (NaCl). It should be noted that sodium chloride does not exist as molecules but aggregates of oppositely charged ions.

But I am getting confused in the last line, I.e. NaCl does not exist as molecules but aggregates of oppositely charged ions.

What is meant by this statement??

Please explain very clearly and conceptually.

Q.

Molten sodium chloride conducts electricity due to the presence of:

1. free electrons

2. free ions

3. free molecules

4. atoms of sodium

Q. Why dry hydrogen does not contain ions?

Q. Anhydrous AlCl3 is covalent if the energy to ionize AlCl3 = 5215 kJ mol-1. Hydration energy for Al+ = -4670kJ mol-1 and hydration energy for Cl- = -381kJ mol-1. Will it remain covalent or become ionic in aqueous solution?

Q.

State whether the following statement is true or false.
The aqueous solution of an ionic compound conducts electricity because there are plenty of free electrons in the solution.

Q.

Compound X consists of molecules. In the liquid state, X will :

1. become ionic
2. conduct electricity
3. not conduct electricity
4. behave as an electrolyte

Q.

A solution of ionic compound conducts electricity due to the presence of:

1. Electrons

2. Atoms

3. Molecules

4. Ions

Q.

Common salt in solid form acts as

1. Insulator

2. Conductor

3. Electrolyte

4. None of these

Q.

Molten sodium chloride conducts electricity due to the presence of:

1. free electrons

2. free ions

3. free molecules

4. atoms of sodium

Q. 21. The e.a of cl is 3.7 eV. How much energy in kcal is released when 2g of cl is completely converted to chloride ion in a gaseous state? (1 eV= 23.06 kcal/ mole)

Q. Assertion :A salt dissolved in an organic solvent will be a good electrical conductor. Reason: Salts will not dissolve appreciably in an organic solvent.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but the Reason is correct

Q.

Molten sodium chloride conducts electricity due to the presence of

1. Free electrons

2. Free molecules

3. Atoms

4. Free ions

Q.

Question 20.
In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus ( see the figure ) was set up.

Which among the following statement(s) is/ are correct?
(i) Bulb will not glow because electrolyte is not acidic.
(ii) Bulb will glow because NaOH is a strong base and furnishes ions for conduction.
(iii) Bulb will not glow because circuit is incomplete.
(iv) Bulb will not glow because it depends upon the type of electrolytic solution.

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) only
(d) (iv) only

Q.

In a book it is written that ions in ionic compounds become free to move in aqueous solution i.e NaCl becomes Na+ and Cl- in aqueous solution and the ions become free to move. Is it true?

Q.

Find the odd one out (note: valency is not a criterion).

1. Phosphorus

2. Iodine

3. Sulphur

4. Carbon

Q.

Why to certain compounds conduct electricity in their molten or fused state?

Q.

Molten sodium chloride conducts electricity due to the presence of:

1. Free electrons

2. Free ions

3. Free molecules

4. Atoms of sodium and chlorine