A solid with high electrical and thermal conductivity from the following is
Si
Li
NaCl
Ice
500 ML of nirogen at 27oC is cooled to -5oC at the same pressure. The new volume becomes
326.32 mL
446.66mL
546.32mL
771.56mL
Most crystals show good cleavage because their atoms, ions or molecules are
weakly bonded together
strongly bonded together
spherically symmetrical
arranged in planes
The edge length of a centred unit cubic cell is 508 pm. If the radius of the cation is 100pm, the radius of the anion is
288 pm
398 pm
154 pm
618 pm
The correct value of the gas constant 'R' is close to
0.082 L- atm K
0.082 L- atm K -1 mol-1
0.082 L atm Kmol-1
0.082 L-1 atm-1 K mol
A pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming
allotropic crystals
liquid crystals
isomeric crystals
isomorphous crystals
The number of atoms contained in a fcc unit cell of a monoatomic substance is
1
2
4
6
A liquid can exists only
between triple point and critical temperature
at any temperature above the melting point
between melting point and critical temperature
between boiling and melting temperature
Van der waals' real gas, act as an ideal gas, at which condition?
High temperature, low pressure
Low temperature, high pressure
High temperature, high pressure
Low temperature, low pressure
If p, V, M, T and R are pressure, volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by,
RT/ PM
P/RT
M/V
PM/RT
