A pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature, and still at higher temperature turbidity completely disappears. This behaviour is a characteristic of substances forming:
allotropic crystals.
liquid crystals.
isomeric crystals.
isomorphous crystals.
The constant the temperature in a given mass of an ideal gas:
the ratio of pressure and volume always remains constant.
volume always remains constant.
pressure always remains constant.
the product of pressure and volume always remains constant.
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-1 K mol-1
0.082 L-1 atm -1 K mol
A liquid can exist 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.
Absolute zero is defined as the temperature:
at which all molecular motion ceases.
at which liquid helium boils.
at which ether boils.
All of the above.
