4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Bohr model of atom is contradicted by

Which of the following species has four lone pairs of electrons in its outer shell?

Linear combination of two hybridised orbitals belonging to two atoms and each having one electron leads to the formation of :

Alkali metals are generally silvery white but beryllium and magnesium appears to be :

Which substance is having molecular solid

A metallic carbide on treatment with water gives a colourless gas which burns readily in air and which gives a precipitate with ammoniacal silver nitrate solution. Gas evolved is