CHEMICAL BONDING AND MOLECULAR STRUCTURE- quiz 1

CHEMICAL BONDING AND MOLECULAR STRUCTURE- quiz 1

Dear Readers,

JEE Advanced is a high level exam that checks your concept by putting various types of questions. The questions are in a different format from JEE mains.m, herein the questions are : single correct multiple choice questions, multiple correct multiple choice questions, statement based questions and comprehension type questions.

Q1. Which represents metallic character in an element?:

•  
  
•  
  
•  
  
•  None of these

Solution
(a) Partially filled bonds or overlapping bonds represent metal

Q2.The enolic form of acetone contain:

•  10 σ bonds, 1 π bond and 1 lone pair
•  8 σ bonds, 2 π bonds and 2 lone pairs
•  9 σ bonds, 1 π bonds and 2 lone pairs
•  Isoelectronic and weak field ligands

Solution

Q3.  The common features among the species CN^-,CO and NO^+ are:

•   Bond order three and isoelectronic
•  Bond order three and weak field ligands
•  Bond order two and π-acceptors
•  Isoelectronic and weak field ligands

Solution

Q4. The high density of water compared to ice is due to

•  Hydrogen bonding interactions
•  Dipole-dipole interactions
•  Dipole-induced dipole interactions
•  Induced dipole induced dipole interactions

Solution
(a) Due to H-bonding in water molecules, water has high density

Q5.Among the following species, identify the isostructural pairs NF_3,NO_3^-,BF_3,H_3 O^+,HN_3

•  [NF_3,NO_3^- ] and [BF_3,H_3 O^+ ]
•  [NF_3,HN_3 ] and [NO_3^-,BF_3 ]
•  [NF_3,H_3 O^+ ] and [NO_3^-,BF_3 ]
•  [NF_3,H_3 O^+ ] and[HN_3,BF_3 ]

Solution
 

Q6. Which combination will give the strongest ionic bond??

•  K^+ and Cl^-
•  K^+ and O^(2-)
• Ca^(2+)and Cl^-
•  Ca^(2+)and O^(2-)

Solution
(d) Force of attraction between cation and anion is F=(kz_1 z_2 e^2)/r^2 Where, k is dielectric constant of the medium.z_1 and z_2 are charges on cation and anion, and r the internuclear distance Size ofCl^->O^(2-) K^+>Ca^(2+) Charge onCa^(2+)>K^+ O^(2-)>Cl^-

Q7.Ratio of σ and π bonds is maximum in

•  Naphthalene
•  Tetracyano methane
•  Enolic form of urea
•  equal

Solution
(c) C

Q8.In which pair or pairs is the strongest bond found in the first species? I: O_2^(2-),O_2; II: N_2,N_2^+ III: NO^+,NO^- :

•  a) I only
•  b) II onlyt
•  c) I and III only
•  d) II and III only

Solution

Q9.(C-Cl) bond in CH_2=CH-Cl (vinyl chloride) is stabilized in the same way as in

•  Benzyl chloride
•  Benzoyl chloridet
•  Chlorobenzene
•  Allyl chlorider

Solution
c

Q10. Select the correct statement about resonance

•  The larger the number of the contributing structures, the greater the stability of the moleculee
•  Greater number of the covalent bonds add to the stability of the molecule
•  The positive charge should reside, as far as possible, on the less electronegative element
• All the above are correct statements

Solution
d.