MP, BP and Electrical Conductivity

Q. Why do alcohol and glucose not conduct electricity although they have hydrogen atom? ( please give an elaborated answer which I can write in the board exam)

Q.

Explain why a solution of cane sugar does not conduct electricity but a solution of common salt is a good conductor of electricity.

Q.

Draw the electron dot structure of methane( ${\mathrm{CH}}_4$).

Q. Carbon has highest thermal conductivity of any known substance. Then why carbon rotted tools don't overheat and are extensively used for striking and cutting proposes? Is it that the good thermal conductors don't overheat? Please explain.

Q.

The solution of one of the following compounds will not conduct electricity. This compound is:
(a) $NaCl$

(b) $CC{l}_4$

(c) $MgC{l}_2$

(d) $CaC{l}_2$

Q.

An element A has 4 valence electrons in its atom whereas element B has only one valence electrons its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed ? Give its electron dot structure.

Q.

Assertion(A): Graphite is a good conductor of electricity.

Reason(R): Graphite has free electrons.

1. Both A and R are true and R is the correct explanation of A.

2. Both A and R are true, but R is not the correct explanation of A.

3. A is true and R is false.

4. A is false and R is true.

Q. Why does impure water conduct electricity whereas pure water does not?

Q.

Two non-metals combine with each other by the sharing of electrons to form a compound X.
(a) What type of chemical bond is present in X?
(b) State whether X will have a high melting point or low melting point.
(c) Will it be a good conductor of electricity or not?
(d) Will it dissolve in an organic solvent or not?

Q.

You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting ?

Q. What is the primary requirement for a compound to be a good conductor of electricity?

1. Presence of free electrons
2. Presence of free ions
3. Compound should have covalent bonds
4. Neutral atoms

Q.

What is the vacancy of nitrogen in N2 molecules and why

Q. If covalent compounds have low melting and boiling point then why does diamond have a very high melting point above 3500 degree celsius?

Q.

You can buy solid air fresheners in shops. Do you think these substances are ionic or covalent? Why?

Q.

Oxygen is neutral in nature. Justify.

Q. A carbon atom has six electrons in its outermost shell.

1. True
2. False

Q. Ionic compounds are in water because it is in nature.

1. insoluble
2. soluble
3. non-polar
4. polar

Q. If covalent compounds have low melting and boiling point then why does diamond have a very high melting point above 3500 degree celsius?

Q.

State if the following statements are True or False. Rewrite the false statements correctly.

Graphite is a good conductor of electricity.

1. True
2. False

Q. Generally, covalent compounds have high melting and boiling points.

Q. Question 2
Which of the following statements are usually correct for carbon compounds? These
(i) Are good conductors of electricity
(ii) Are poor conductor of electricity
(iii) Have strong forces of attraction between their molecules
(iv) Do not have strong forces of attraction between their molecules

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

Q. Which of the following is false about diamond?

1. It has a high melting point
2. It has a low melting point
3. It is a good conductor of electricity
4. It is insoluble in solvents

Q.

Answer the following questions:

Graphite conducts electricity whereas diamond does not.Explain.

Q. Which of the following statements are usually correct for carbon compounds? These:
(a) are good conductors of heat and electricity
(b) are poor conductors of electricity
(c) have strong forces of attraction between their molecules
(d) do not have strong forces of attraction between their molecules

1. (a) and (c)
2. (a) and (d)
3. (b) and (d)
4. (b) and (c)

Q.

Give a reason for the following

Carbon tetrachloride is a liquid but does not conduct electricity

Q. Graphite is a conductor of electricity while diamond is a conductor of heat right?

Q.

Which of the following statements are usually correct for carbon compounds?

These :

(a) are good conductors of electricity.

(b) are poor conductors of electricity.

(c) have strong forces of attraction between their molecules.

(d) do not have strong forces of attraction between their molecules.

1. (a) and (c)
2. (b) and (c)
3. (b) and (d)
4. (a) and (d)

Q. why is graphite a good conductor of electricity but not diamond , although both are covalent solids ?

Q. State the electronic configuration for argon? [$p=18,n=22$]

1. $2,8,5$
2. $2,8,6$
3. $2,8,7$
4. $2,8,8$

Q. Why is graphite placed in covalent solids?It has good electrical and thermal conducting nature and covalent solids are insulators.