Assertion : Effusion rate of oxygen is smaller than nitrogen.
Reason : Molecular size of nitrogen is smaller than oxygen.
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 : All molecules in a gas have same speed.
Reason : Gas contains of different size and shape
Molecules/ions and their magnetic properties are given below
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..
Assertion : We air is heavier than dry air.
Reason : The density of a dry air is more than density of water.
A pure crystalline substance, on being heated gradually, first forms a turbid looking liquid and then the turbidity completely dis..
Which one of the following Statements is not correct about the three states of matter i.e. solid, liquid and gaseous
The root mean square speeds at STP for the gases H2 , N2 ,O2 and HBr are in the order
The characteristic features of solid are
The 8 : 8 type of packing is present in
Which one of the following is good conductor of electricity
Davy and Faraday proved that
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..
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..
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
For orthombic system axial ratios are a#b#c and the axial angles are
In the solid state, MgO has the same structure as that of sodium chloride. The number of oxygens surrounding each magnesium in MgO..
If the pressure and absolute temperature of 2 litres of CO2 are doubled, the volume of CO2 would become
Dulong and Petits law is valid only for
With which one of the following elements silicon should be doped so as to give p-type of semiconductor
The number of carbon atoms per unit cell of diamond is
A solid has a structure in which, atoms of W, O and Na are located respectively at the corners, centre of edge and at the centre o..
The temperature and pressure at which ice, liquid water and water vapour can exist together are
Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centigrade rise in temperature ..
Quartz is are crystalline variety of
The substance which does not show sharp melting point is
A crystalline solid
Which one of the following metal oxides is antiferromagnetic in nature
Which type of solid crystals will conduct heat and electricity
Which of the following is ferroelectric compound
The ability of a given substance to assume two or more crystalline structure is called
Crystalline solids are
Among solids the highest melting point is established by
A volume of 1 m3 is equal to
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