19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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…
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…
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…
Ionic bonds will be formed more easily between elements with comparatively.
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
Lattice energy of a solid increases if.
Lattice energy of an ionic compound depends upon
Consider the following statements ; I. In ionic solids, the sum of the electron gain enthalpy and the ionisation enthalpy may be positive but still the crystal structure gets stabilised due to the energy released in t…
The most stable compound is :
Which combination will give the strongest ionic bond?
An ionic compound A+B– is most likely to be formed when:
Lattice energy of an ionic compound depends upon
Which of the following compounds contain(s) no covalent bond(s)? KCl, PH3, O2, B2H6, H2SO4
In which of the following species the bonds are non- directional?
The melting point of RbBr is 682ºC while that of NaF is 988ºC. The principal reason for this fact is :
The amount of energy released when one mole of ionic solid is formed by packing of gaseous ion is called :
I. When a gas phase atom in its ground state gains an electron, the enthalpy change is called electron gain enthalpy. II. The electron gain process is always exothermic. III. The ionization enthalpy process is always …
The lattice energy of KF, KCl, KBr and KI follow the order:
Among the following the maximum covalent character is shown by the compound
Consider the following statements : I. The smaller the size of cation and larger the size of anion, the greater the covalent character of an ionic bond. II. The greater the charge on the cation the greater will be the…
The compound with the highest degree of covalency is :
The lowest O – O bond length in the following molecule is :