CBSE Class 11 Chemistry Chemical Bonding And Molecular Structure Worksheet Set 06

Official Class 11 Chemistry Worksheets: Chapter 04 Chemical Bonding and Molecular Structure

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Chapter-wise Practice Material: Chapter 04 Chemical Bonding and Molecular Structure

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CHEMICAL BONDING AND MOLECULAR STRUCTURE
 
I. Choose the Best Answer
 
1. Which of the following molecules has both covalent and ionic bond
 
(a) CH3Cl    (b)NH4Cl     (c) HCl     (d) BeCl2
 
2. Identify correct statement regarding NH3 and BF3
 
(a) Both are Lewis acid        (b) Both are iso structural
(c) Both are Lewis base       (d) Have different values of dipole moment
 
3. Identify the molecule having sideways overlapping of atomic orbitals
  
(a) CH4    (b) CO2      (c) NH3        (d) H2O
 
4. Which of the following chemical species is most stable?
 
(a) O2     (b) O2+      (c) O2–        (d) O22–
 
5. The shape of XeF4 molecule according to VSEPR theory is
 
(a) Square planar (b) Square pyramid (c) Tetrahedral (d) Pyramidal
 
II. Fill in the Blanks
 
1. The energy required to completely separate one mole of solid ionic compound into gaseous constituent ions is called _____________ .
 
2. Among alkali metal ions___________.ion has highest polarizing power.
 
3. Isoelectronic molecules and ions have identical ___________.
 
4. A triple covalent bond consists of ________ sigma and______ pi bonds.
 
5. Atomic orbitals are_________centric and molecular orbitals are________ centric.
 
III. Assertion and Reasoning Questions:
 
Directions: (Questions 1 to 4).
 
A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
 
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
 
C. If Assertion is true statement but Reason is false.
 
D. If both Assertion and Reason are false statements.
 
1. Assertion (A): Among the two O – H bonds in H2O molecule, the energy required to break the first O – H bond and the other O – H bond is the same.
Reason (R): This is because the electronic environment around the oxygen is the same even after breakage of one O – H bond.
 
2. Assertion (A): Though the central atom of both NH3 and H2O molecules are sp3 hybridized,yet H – N – H bond angle is greater than that of H – O – H.
Reason (R): This is because nitrogen atom has one lone pair and oxygen atom has two lone pairs.
 
3. Assertion (A): SF6 molecule is unstable.
Reason (R): A stable molecule must have 8 electrons around the central atom. i.e. octet rule should be satisfied.
 
4. Assertion (A): Pi bond is never formed alone. It is formed along with a sigma bond
Reason (R): Pi bond is formed by sideway overlap of p- orbitals only.
 
5. Assertion (A): Ionic compounds tend to be non-volatile.
Reason (R): Ionic compounds are solid.
 
IV Descriptive Questions:
 
1. Why NH3 and BF3 have different shapes?
 
2. What are
 
a) expanded octet molecules?
b) odd electron molecules?
c) electron deficient molecules?
 
Give two examples for each.
 
3. Differentiate between
a) Bond energy and Bond dissociation energy
b) Covalent and Van der Waal’s radius
c) Sigma and pi bond
d) Bonding molecular orbital and anti-bonding molecular orbital
 
4. Draw the resonating structures of O3, CO32- ,NO3—, SO2,C6H6 and calculate formal charges on each atom.
 
5. Assign reason for the following;
(i) NH3 is freely soluble in water while PH3 is not.
(ii) B2 is paramagnetic while C2 is not.


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Practice Worksheet and Study Resources for Class 11 Chemistry Chapter 04 Chemical Bonding and Molecular Structure

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