Show that the reactivity of halogens towards dihydrogen decreases on going from fluorine to iodine.

With the help of a reaction show that the reactivity of halogens decreases down the group from F to I.

Which of the following properties among halogens decreses (s)from fluorine to iodine?

Reactivity of transition metals decreases more or less regularly from Sc to Cu. Explain.

Why is that tertiary alcohols show greater reactivity towards hydrogen halides than secondary and primary alcohols ?

Figs, (a) and (b) show the field lines of a positive and negative point charge respectively. Does the kinetic energy of a small negative charge increase or decrease in going from B to A ?

Assertion (A) : Presence of a nitro group at ortho-or para- position increases reactivity of haloarenes towards nucleophilic substitution. Reason (R) : Nitro group, being an electron withdrawing group decreases the electron density over the bvenzene ring.

The french physicist Louis de Broglie in 1924 postulated that matter like radiation show a dual behaviour . He proposed the following relationship between the wavelength lambda of a material particle its linear momentum p and planck constant h lamda=h/p =h/(mv) The de broglie relation implies that the wavelength of a particle should decreases as its velocity increases . it also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de broglie waves. These waves differ from the electromagnetic waves as they (i) have lower velocities (ii) have no electrical and magnetic fields and (iii) are not emitted by the particle under consideration . The experimental confirmation of the de-broglie relation was obtained when Davisson ans Germer in 1927 observed that a beam of electrons is diffracted by a nickel crystal . as diffraction a characteristics property of waves hence the beam of electron behaves as a wave, as proposed by de-broglie. If proton, electron and alpha -particle are moving with same kinetic energy then the order of de-Broglie's wavelength

The french physicist Louis de Broglie in 1924 postulated that matter like radiation show a dual behaviour . He proposed the following relationship between the wavelength lamda of a material particle its linear momentum p and planck constant h lamda=h/p =h/(mv) The de broglie relation implies that the wavelength of a particle should decreases as its velocity increases . it also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de broglie waves. These waves differ from the electromagnetic waves as they (i) have lower velocities (ii) have no electrical and magnetic fields and (iii) are not emitted by the particle under consideration . The experimental confirmation of the de-broglie relation was obtained when Davisson ans Germer in 1927 observed that a beam of electrons is diffracted by a nickel crystal . as diffraction a characteristics property of waves hence the beam of electron behaves as a wave, as proposed by de-broglie. de- Broglie wavelength of an electron travelling with speed equal to 1% of the speed of light