JEE Questions

Why is sulfur so important?

Sulphur is very important for life. Sulphur is the key component in amino acids like methionine and cysteine which is used to make proteins. It is also required for some coenzymes. Sulphur is needed to protect the cells and fix the DNA in the human body to protect from diseases like cancer. Sulphur helps in […]

Why is Potassium Permanganate Purple in Colour

The colour of KMnO4 is due to transitions of charge transfer by the absorption of visible light. Metal ions possess the electron in KMnO4 and thus the transition of charge takes place from O to Mn+. Undiluted permanganate potassium has a striking purple tint, but pink should be a diluted solution. Potassium permanganate must be […]

Why is permeability number important?

Permeability number is the value assigned to moulding materials indicating the relative ease of passage of gases through them. A high value of permeability number will lead to penetration-type defects and rough castings. A decrease in permeability number indicates tighter packing and could lead to blows and pinholes.

Why Is NO2+ An Electrophile?

An ion is said to be electrophile when it craves for an electron. In NO2+, the nitrogen atom is bonded to one oxygen by the double bond while to the other oxygen atom by the coordinate covalent bond. Therefore, there is an unpaid electron on the nitrogen atom which gets ionised by the positive charge. […]

Why is Negative Free Energy Spontaneous

A spontaneous reaction is a reaction that under the conditions under which the reaction occurs, favours the forming of products. During a combustion reaction, the system’s entropy increases. The mixture of decreasing energy and boosting entropy determines that spontaneous reactions are combustion reactions. The reaction is random if the Gibbs Free Energy is negative, and […]

Why Is Molality Used In Colligative Properties?

Colligative properties are dependent on the number of particles present in the solution. We know that molality is the kilograms of solvent which remains unchanged with respect to temperature. Therefore, molality is used in colligative properties. Stay tuned with CoolGyan’S to learn more about other concepts such as the types of colligative properties.

Why is magnesium paramagnetic

The magnesium metal is paramagnetic in spite of not having an unpaired electron. Magnesium metal shows very small paramagnetic properties since the application of an external magnetic field changes the population of the spin-up and the spin-down electrons. This results in a small difference in the population and hence magnesium is paramagnetic.