A weather ballon filled with hydrogen at 1 atm and 27Â° C has volume equal to 12000 litres. On ascending it reaches a place wher..
A particular solid is very hard and has a high melting point. In solid state it is a non conductor and its melt is a conductor of ..
Assertion : 4.58mm and 0.0098Â°C is known to be triple point of water.
Reason : At this pressure and temperature all the three s..
Molecules/ions and their magnetic properties are given below
A pure crystalline substance, on being heated gradually, first forms a turbid looking liquid and then the turbidity completely dis..
Assertion : All molecules in a gas have same speed.
Reason : Gas contains of different size and shape
Which one of the following Statements is not correct about the three states of matter i.e. solid, liquid and gaseous
Assertion : We air is heavier than dry air.
Reason : The density of a dry air is more than density of water.
The characteristic features of solid are
Which one of the following is good conductor of electricity
The root mean square speeds at STP for the gases H2 , N2 ,O2 and HBr are in the order
Davy and Faraday proved that
The 8 : 8 type of packing is present in
A compound is formed by elements A and B. This crystallises in the cubic structure where the A atoms are at the corners of the cub..
A solid compound contains X , Y and Z atoms in a cubic lattice with X atom occupying the corners. Y atoms in the body centred posi..
At constant temperature,in a given mass of an ideal gas
Which of the following relations for expressing volume of a sample is not correct
A crystalline solid have
In a cubic structure of diamond which is made from X and Y, where X atoms are at the corners of the cube and Y at the face centres..
Dulong and Petits law is valid only for
In the solid state, MgO has the same structure as that of sodium chloride. The number of oxygens surrounding each magnesium in MgO..
For orthombic system axial ratios are a#b#c and the axial angles are
If the pressure and absolute temperature of 2 litres of CO2 are doubled, the volume of CO2 would become
The temperature and pressure at which ice, liquid water and water vapour can exist together are
Which one of the following metal oxides is antiferromagnetic in nature
Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centigrade rise in temperature ..
The number of carbon atoms per unit cell of diamond is
Quartz is are crystalline variety of
A crystalline solid
Crystalline solids are
With which one of the following elements silicon should be doped so as to give p-type of semiconductor
Pressure of a gas in a vessel can be measured by
The ability of a given substance to assume two or more crystalline structure is called
A volume of 1 m3 is equal to
The substance which does not show sharp melting point is
Which of the following statements is wrong for gases
Kinetic energy of molecules is highest in
Correct gas equation is
Which of the following is ferroelectric compound
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