Chemistry Spl

Hello Neha,
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Intermolecular forces (IMFs) are the forces which mediate interaction between molecules. They also include forces of attraction or repulsion which act between molecules and other types of neighboring particles (e.g., atoms or ions). They are weak compared to the intramolecular forces, the forces which keep a molecule together. For example, the covalent bond, involving the sharing of electron pairs between atoms, is much stronger than the forces present between neighboring molecules. Both sets of forces are essential parts of force fields frequently used in molecular mechanics.

If you study these subjects thoroughly, then you'll be able to crack the exam.

Avogadro's law states that, equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.
For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional, if the temperature and pressure are constant.

You should stick to NCERT, even for physics and practice previous year's question papers to clear NEET.

Hi,
Cation is formed when one or more electrons are removed from the outermost orbit of the electron. So, when the electron is removed from an atom the mass and the size of the electron decreases. So, the size of cation is less when compared to atom. The reason is that when the electron is removed from the outermost orbit if only 1 electron is there in the outermost orbit then when that electron is removed from that orbit the orbit vanishes and hence the size decreases and also the inter-nuclear force also effects the size. So, when an electron is removed from the inter-nuclear force decreases and hence the decreases.

You need to concentrate on physics and chemistry too.