Lewis Dot Structure

Q.

Which of the following is a polar molecule?

1. Ammonia $\left({\mathrm{NH}}_3\right)$

2. Methane $\left({\mathrm{CH}}_4\right)$

3. Ethylene $\left({\mathrm{C}}_2{\mathrm{H}}_4\right)$

4. Carbon Tetrachloride $\left({\mathrm{CCl}}_4\right)$

Q.

What is lone pair of electrons

Q. Identify the correct Lewis dot structure of $O_2$ molecule.

1. 

2. 

3. 

4. 

Q. Why atoms cant exist independent? Why some atom can exist independently?

Q.

How many sigma and Pi bonds are in ${\mathrm{HCONHCH}}_3$?

Q.

The number of electron in the valence shell of Strontium is/are ________.

Q.

How the shape of the molecule differ from geometry in bonding?

Q.

When non-polar molecular solids are either liquids or gases, why are they termed solids?

Q.

Elements A, B and C have atomic numbers 17, 19 and 10 respectively.
State which one is:
i) A non-metal
ii) A metal
iii) Chemically inert.

1. A -> Metal
   B -> Non-Metal
   C -> Chemically inert

2. A -> Chemically inert
   B -> Metal
   C -> Non-Metal

3. A -> Metal
   B -> Chemically inert
   C -> Non-Metal

4. A -> Non-Metal
   B -> Metal
   C -> Chemically inert

Q.

Write covalent bonding in nitrogen.

Q.

If we dissolve sugar in water the sugar molecules break and get into the spaces of water molecule but when a piece of iron is placed into water it donot dissolve , why sugar breaks into molecules and iron donot.

Q. Identify the compound which has highest density among the following.

1. Water
2. Carbon dioxide
3. Hydrogen chloride
4. Sodium chloride

Q.

Which of the following H-bonds is expected to have the maximum strength?

1. H-O......H

2. H-N.......H

3. H-S.......H

4. All have same strength

Q. Which of the following compounds has the structure shown below ?

1. Ethene
2. Ethane
3. Methane
4. Propane

Q. Arrange the given elements in the increasing order of their valency:

1. Lithium
2. Beryllium
3. Boron
4. Carbon

Q. Question 12
Elements with valency 1 are

(a) always metals
(b) always metalloids
(c) either metals or non-metals
(d) always non-metals

Q.

Question 9
Which of the following are not ionic compounds?
(i) $\text{KCl}$
(ii) $\text{HCl}$
(iii) ${\text{CCl}}_4$
(iv) $\text{NaCl}$

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

Q. The above given figure is the correct electron dot structure of a water molecule.

1. True
2. False

Q. Is ammonia a polyatomic molecule

Q. A phosphorus atom has a total of 15 electrons. Its outermost shell _______ will have ______ electrons.

1. L; 5
2. M; 5
3. L; 8
4. M; 8

Q. Bond length of H-H is 0.64 and the bind length of F2 is 1.2. Electronegativities of H and F respectively are 2.1 and 4.1.What is the bond length of HF? 1)0.64 2)0.92 3)0.82 4)0.62

Q.

Does $\mathrm{CO}$ have a double bond?

Q. Na${}^{+}$ has completely filled K and L shells. Explain.

Q. Two combining atoms having six valence electrons each will share electron pairs.

1. one
2. two
3. three
4. four

Q.

An element L consists of molecules. What type of bonding is present in the particles that make up L?

Q. Which of the following is the incorrect representation of the formation of molecules in Lewis dot structures?

1. 
2. 
3. 
4. 

Q.

What is the principal quantum number for the second period?

Q.

An element that loses electrons?

Q.

Chemically active atoms have a complete octet.

1. True

2. False

Q. In a lewis dot structure, each dot represents the valence electrons.

1. True
2. False