Express formation of the following molecules with dot signs for electrons: `N_(2),H_(2)O,CaO,HCl`.

Arrange the following molecules in increasing order of number of lone pair of electrons. H_(2)O,PCl_(3),H_(2)O,BF_(3)

Draw the Lewis structures of the following molecule : H_2O

Explain the formation of O_2 molecule by molecular orbital theory.

Write structures of the following molecules: H_(2)S_(2)O_(7)

Group the following as linear and non-linear molecules : H_(2)O,HOCl,BeCl_(2),Cl_(2)O

Explain the formation of H_(2) molecule on the basis of valance bond theory.

identify the following as acidic, basic or amphoteric oxides: BeO,Al_(2)O_(3),CaO,SiO_(2) .

In the formation of N_2^+ , the electron is lost from :

(i) What do you mean by standard enthalpy of formation? (ii) Is the standard enthalpy of reaction of the following reaction equal to the standard enthalpy off formation of H_(2)O(l) at 25^(@)C:H_(2)(g)+(1)/(3)O_(3)(g)toH_(2)O(l) ? Explain.

In the formation of N_(2)^(+) from N_(2) molecule the electron is removed from a