Question

In which one of the following cases, breaking of covalent bond takes place?

Solution

Correct option is

During melting of SiO2 the giant network structure held by covalent bonds breaks to give individual molecules of  In contrast, during boiling of  only change of state occurs from liquid to gaseous; during melting of KCN, electrostatic attraction between  ions is overcome; during boiling of  van der Walls’ forces of attraction breaks.

SIMILAR QUESTIONS

Q1

CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is

Q2

The correct sequence of decreasing dipole moments of the following molecules will be

Q3

Which of the following species is not paramagnetic?

Q4

Which of the following has maximum dipole moment?

Q5

The correct order of decreasing bond length for , NO and NO+ is

Q6

Among the species:  which has the weakest C – O bond?

Q7

Which bond angle  would result in the maximum dipole moment for the triatomic molecule yxy?

Q8

The dipole moment of HBr is  and interatomic spacing is  The %ionic character of HBr is

Q9

In a polar molecule, the ionic charge is  If the interionic distance is  unit, then the dipole moment is

Q10

Which of the following does not contain coordinate bond?