Week $2$ : Assignment $2$

Assignment not submitted

Van de Waals bond is

i$.$ non$-$directional

ii$.$ irreversible to heat

ii$.$ weaker than hydrogen bond

iv$.$ reason for space in ice crystal

v$.$ deformable

Which of the statement$($s$)$ is$/$are correct

i$,$ ii$,$ and iv

i$,$ ii$,$ and $v$

i$,$ iii, and $v$

All the above

In case of NaCl, which of the following statement is correct

The valency of the material is one

The material has reached the octet configuration

Electrical neutrality of the atom is stabilised

All the above

Consider an element with five valence electrons, the stable structure more likely to be adopted will be

Compound

Chain

Sheet

$3$D network

Using the Condon$-$Morse diagram select which of the following statement is true

Higher the lattice energy, shallower will be the well

lonic bond will have shallow well compared to van der Waals bond

Deeper the well lesser will be the boiling point

Shallower well lesser will be the thermal expansion

Arrange in ascending order of strength

$Cu-Be,Cu-Sn,Cu-Zn$

$Cu-Zn,Cu-Sn,Cu-Be$

$Cu-Sn,Cu-Zn,Cu-Be$

$Cu-Be,Cu-Zn,Cu-Sn$

Which of the following statement is true?

Higher the number of grain boundaries, more will be ductility

All bonds have to be broken in case of twinning

Diffusivity of atoms at the grain boundary is higher than that within the bulk

All of the above

When does amorphous structure form

Thermal energy is much lower than the nucleation energy

Nucleation occurs rapidly

Cooling is done gradually

All of the above

Which type of clay neither absorb nor adsorb water

Kaolinite

Halloysite

Montmorillonite

Muscovite

Graphite is made up of

Purely covalent bond

lonic and hydrogen bond

Covalent and Van der Waals bond

Covalent and ionic bond

Which of the following material is an ideal choice for the manufacture of radiator?

Quartz

Carbon nano tubes

Thermoset polymers

Copper