Lewis Dot Structure

Q.

How do you know if a molecule is polar or nonpolar ?

Q.

(a) Draw an electron dot diagram to show the structure of each of the following :

(i) Hydronium ion, (ii) Ammonium ion,

(iii) Hydroxyl ion

State the type of bonding present in them.

(b) Give two examples in each case :

(i) Co-ordinate bonds compounds,

(ii) Solid covalent compounds,

(iii) Gaseous polar compounds,

(iv) Gaseous non polar compounds,

(v) Liquid non polar compounds

Q.

How many Lone Pairs does Oxygen have?

Q.

$\left(\mathrm{i}\right)$Write the electron dot structure for sodium and oxygen.

$\left(\mathrm{ii}\right)$ Show the formation of ${\mathrm{Na}}_2\mathrm{O}$ and $\mathrm{MgO}$ by electron transfer of electrons.

$\left(\mathrm{iii}\right)$ What are the ions present in these compounds?

Q. 50.What should be the order of 2nd and 3rd period elements of electron affinity with reason

Q.

What is the valency of Gold (Au)

Q. How many covalent bonds are present in ethane?

Q.

Question 50
(a) Write the formula and draw electron dot structure of carbon tetrachloride
(b) What is saponification? Write the reaction involved in this process.

Q.

Write the structural formula of propene.

Q.

Is CH₃Cl a Hydrogen Bond?

Q.

Write the symbol and valency of bismuth.

Q. The total number of shared electrons in the lewis dot structure of a $O_2$ molecule is:

1. 4

Q. Which of the following molecules contains covalent and coordinate bonds? And how? a) CCl4 b)H2SO4 c)NaCl d)Mg(OH)2

Q.

In the electron dot structure, the valence shell electrons are represented by crosses or dots.

(a) The atomic number of chlorine is $17$. Write its electronic configuration

(b) Draw the electron dot structure of chlorine molecule

Q. Why we write chlorine molecule as Cl2 if its valency is 1?

Q.

Match the column A with column B.

Column A	Column B
(i) Sodium chloride (ii) Ammonium ion (iii) Carbon tetrachloride	Covalent bond Ionic bond Covalent and coordinate bond

Q.

(a) Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d) given below:
(i) The type of bonding in X will be:
(a) ionic
(b) electrovalent
(c) covalent
(d) molecular
(ii) X is likely to have a:
(a) low melting point and high boiling point
(b) high melting point and low boiling point
(c) low melting point and low boiling point
(d) high milting point and high boiling point
(iii) In the liquid state, X will:
(a) become ionic
(b) be an electrolyte
(c) conduct electricity
(d) not conduct electricity

(b) (i) Acids dissolve in water to produce positively charged ions. Draw the structure of these positive ions.
(ii) Explain, why carbon tetrachloride does not dissolve in water?
(iii) Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in?
(iv) Can Q and S, both be metals? Justify your answer.

Q.

Write the structural formula of propyne.

Q. The diffused impurities with ___ valence electrons are called donor atoms.

Q.

Three Centre two-electron bond is present in

1. ${\left({\mathrm{BeCl}}_2\right)}_2$

2. ${\mathrm{Li}}_2{\mathrm{C}}_2$

3. ${\mathrm{LiAlH}}_4$

4. ${\left({\mathrm{BeH}}_2\right)}_2$

Q.

The C-C bond length is minimum in ___

1. ethane

2. ethene

3. ethyne

4. butane

Q.

Write the :
(a) molecular formula,
(b) electron dot formula and
(c) structural formula of methane and ethane.

Q.

Write the electron-dot structures for : (i) ethane, (ii) ethene, and (iii) ethyne.

Q.

Write the symbol and valency of strontium.

Q.

Nitrogen molecule contains a ______ bond.

1. single

2. double

3. triple

4. none of these

Q. In a Lewis dot structure, each dot represents an electron.

1. True
2. False

Q.

Write the formula of the product formed when element A (atomic number 19) combines with element B (atomic number 17). Draw its electronic dot structure. What is the nature of the bond formed?

Q. Question 50 (b)
An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.

Draw the electron dot structure of the diatomic molecule of X. What type of bond is formed in it?

Q.

Write down (i) structural formula, and (ii) electron-dot formula, of any one isomer of hexane ($C_6{H}_{14}$), other than n-hexane.

Q. Write the following properties of ethene:
(d) Solubility