19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Ionic compounds in the crystalline state consist of orderly three dimensional arrangements of …X… and …Y… held together by coulombic interaction energies. In the above statement X and Y refer to
Ionic bonds will be formed more easily between elements with comparatively.
Consider the following statement, I. The formation of the positive and negative ions from the neutral atoms by loosing and gaining electrons respectively. II. The arrangement or position of the positive and negative i…
Which of the following is/are correct? I. Generally the lowest energy structure is the one with the smallest formal charges on the atoms. II. The formal charge is a factor based on a pure covalent view of bonding in w…
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…
In the given structure, the formal charge on the oxygen atom of P ─ O bond is
Calculate the formal charge of C in CH4.
Lewis dot structure of CO,NO2- and CO32- are I, II and III respectively. Which of these structure(s) is/are wrong?
Which of the following Lewis representation of the molecules NF3, O3 and HNO3 is correct?
How many double bonds are present in carbon dioxide molecule?
When two atoms share two electron pairs they are said to be joined by a
Which of the following compound is covalent?
Find out the correct Lewis symbol for the atom carbon among the following options.
The group valence of the element is generally equal to the
Lewis introduced simple notations to represent valence electrons in an atom called.
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