19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Given the correct order of initials T or F for the following statements. Use T is statement is true and F if it is false: (I) The order of repulsion between different pair of electrons is LP – LP > LP –BP > BP – BP (I…
Which molecule has regular geometry? (I) SnCl (II) NH (III) PCl (IV) SF
Which of the following compounds have the same no. of lone pairs with their central atom? (I) XeF (II) BrF (III) XeF (IV) H S (V) Triple Methylene
The compound MX is tetrahedral. The number of XMX angles in the compound is:
The attractive force which holds various constituents (atoms, ions etc.) together in different chemical species is called a
Kossel and Lewis approach was based on the
According to Kossel and Lewis approach, the outer shell can accommodate a maximum of …X… electrons. Here, X refers to
Lewis postulated that atoms achieve the stable octet when they are linked by
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.
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 …
According to Lewis and Kossel approach, which of the following molecules has complete octet of the central atom?
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…
The important condition(s) for Lewis dot structure of covalent compounds is/are
The number of dots around the Lewis symbol represents:
Lewis introduced simple notations to represent valence electrons in an atom called.
The group valence of the element is generally equal to the
Find out the correct Lewis symbol for the atom carbon among the following options.
Which of the following compound is covalent?
When two atoms share two electron pairs they are said to be joined by a
How many double bonds are present in carbon dioxide molecule?
Which of the following Lewis representation of the molecules NF3, O3 and HNO3 is correct?
Lewis dot structure of CO,NO2- and CO32- are I, II and III respectively. Which of these structure(s) is/are wrong?
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…