JEE Advanced Mi...

Mark the correct options.

An electron makes a transition from n = 2 to n = 1 state in a hydrogen like atom.

Statement–2 : In α decay the mass number decreases by 4 unit and atomic number decreases by 2 unit. In β decay (negative β) the mass number remains unchanged and atomic number increases by 1 unit.

In γ decay, mass number and atomic number remains unchanged.

Statement–1 : In the duration electron jumps from first excited state to ground state in a stationary isolated hydrogen atom, angular momentum of the electron about the nucleus is conserved.

Statement–2 : As the electron jumps from first excited state to ground state, in a hydrogen atom, the electrostatic force on electron is always directed towards the nucleus.

In column-I, consider each process just before and just after it occurs. Initial system is isolated from all other bodies. Consider all product particles (even those having rest mass zero) in the system. Match the system in column-I with the result they produce in column-II.

Which of the following statement is correct with respect to the metal carbonyls of Ist transition series?

When CS₂ layer containing both Br₂ and I2 (2 : 1) is shaken with excess of Cl₂ water, the violet colour due to I₂ disappears and a pale yellow colour appears in the solution. The disappearance of violet colour and appearance of pale yellow colour is due to the formation of :

The following flow diagram represents the extraction of magnesium from sea water.

Which of the following options describes the correct reactants, products and reaction conditions ?

Concentrated sulphuric acid is added followed by heating of each of the following test tubes labelled (i) to (v).

Which of the following statement is incorrect about these observations ?