19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Whenever a single Lewis structure cannot describe a molecule accurately, a number of structures with almost similar energy, position of nuclei, bonding and non-bonding pairs of electrons are taken as the canonical str…
The O─O bond length in ozone molecule is:
In the given resonating structures, which one is called resonance hybrid?
Match the bond type given in Column I with the bond length in column II and choose the correct option from the codes given below Column I Column II A. O-H 1. 154 pm B. C-C 2. 133 pm C. C-O 3. 96 pm D. C=C 4. 143 pm Co…
Which of the following is correct : (a) Bond order stability bond length bond enthalpy (b) Stability bond order bond length bond enthalpy
The bond order in H2, O2 and N2 is respectively
If the bond enthalpy of O2, N2 and H2 are 498 kJ mol-1 , 946 kJ mol-1 and 435.8 kJ mol-1 respectively. Choose the correct order of decreasing bond strength.
The amount of energy required to break one mole of bonds of a particular type between two atoms in a gaseous state is called
Which of the following cannot be used to measure bond lengths?
The Lewis dot structures can be written by adopting the following steps : I. The total number of electrons required for writing the structure are obtained by adding the valence electrons of the combining atoms. II. Kn…
According to Lewis and Kossel approach, which of the following molecules has complete octet of the central atom?
Match the following species of Column I with information given in Column II choose the correct option from the codes given below. Column I Column II A. BCl3 1. Odd electron molecules B. SF6 2. Incomplete octet C. NO2 …
Atoms can combine either by transfer of valence electrons from one atom to another or by sharing of valence electrons in order to have an octet in their valence shells. This is called.
Lewis postulated that atoms achieve the stable octet when they are linked by
According to Kossel and Lewis approach, the outer shell can accommodate a maximum of …X… electrons. Here, X refers to
Kossel and Lewis approach was based on the
The attractive force which holds various constituents (atoms, ions etc.) together in different chemical species is called a
Consider the following statements, 1. The shape of a molecule depends upon the number of valence shell electron pairs (bonded or non-bonded) around the central atom. 2. Pairs of electrons in the valence shell repel on…
What type of hybridization does a BCl3 molecule undergo? a) sp b) sp2 c) sp3 d) sp3d Ans. (b) Sol. In the BCl3 molecule, one s-orbital and two p- orbitals intermix and form three equivalent hybrid orbits. Therefore it…
CH2 = C = CH2 In this molecule (allene)
Cl–C2 bond of this molecule is formed by
The orbitals used by C in forming C–H and C–Cl bonds of CH2Cl2 are
Which of the following orders is correct for electronegativity?
In sp2 orbital, character of pz orbital will be
CH3 – CH2 – CH = CH2 has hybridisation: