IIT-JEE 1982

There are ______ \(\pi\) bonds in a nitrogen molecule.

The compound with no dipole moment is

Among the following, the molecule that is linear is

____ hybrid orbitals of nitrogen atom are involved in the formation of ammonium ion.

Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

At room temparature, ammonia gas at 1 atm pressure and hydrogen chloride gas at P atm pressure are allowed to effuse through identical pin holes from opposite ends of a glass tube of one metre length and of uniform cross-section. Ammonium c...

The energy released when an electron is added to a neutral gaseous atom is called ______ of the atom.

The element with the highest first ionization potential is

The oxidation number of carbon in CH2O is

Write down the balanced equations for the reaction when:
An alkaline solution of potassium ferricyanide is reacted with hydrogen peroxide.

MgCl2.6H2O on heating give anhydrous MgCl2

How will you prepare bleaching powder from slaked lime.

Hydroxylamine reduces iron (III) according to the equation:
2NH2OH + 4Fe3+ \(\to\) N2O(g) \(\uparrow\) + H2O + 4Fe2+ + 4H+
Iron (II) thus produced is estimated by titration with a standard permanganate solution. The reaction is :
$$MnO_...

When there are two electrons in the same orbital, they have _____ spins.

The mass of a hydrogen atom is ______ kg.

Isotopes of an element differ in the number of ______ in their nuclei.

The ion that is isoelectronic with CO is

Calculate the wavelength in Angstrom of the photon that is emitted when an electron in the Bohr orbit, n = 2 returns to the orbit, n = 1 in the hydrogen atom. The ionization potential of the ground state hydrogen atom is 2.17 \(\times\) 10-...

The outer electronic configuration of the ground state chromium atom is 3d4 4s2