Chemistry Question Bank

The number of dots around the Lewis symbol represents:

The important condition(s) for Lewis dot structure of covalent compounds is/are

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

Shape of XeF4 is

Among the following, the molecule with highest dipole moment is :

Which of the following molecules does not have a dipole moment?

The highest dipole moment is of:

Polarity in a molecule and hence the dipole moment depends primarily on electronegatively of the constituent atoms and shape of a molecule. Which of the following has the highest dipole moment?

NH3 and NF3, both the molecules have pyramidal shape with a lone pair of electrons on nitrogen atom. Why does the dipole moment of NH3 is greater than that of NF3? Choose the correct option.

The decreasing order of dipole moments of the molecules HF, H2O, BeF2, NF3 is

Which of the following molecule has dipole moment zero?

The net dipole moment of H2O molecule is

The dipole moment of HF molecule may be represented as (a) (b) (c) (d) Ans. (b) Sol. This arrow symbolizes the direction of the shift of electron density in the molecule.

Dipole moment is usually expressed in Debye units

In which of the following species the bonds are non- directional?

Calculate the formal charge of C in CH4.

In the given structure, the formal charge on the oxygen atom of P ─ O bond is

Assertion (A) Formal charges do not indicate real charge separation within the molecule. Reason (R) Formal charges help in the selection of the lowest energy structure from a number of possible Lewis structure for a g…