Question

Which of the following is a wrong Combination?
1) 6.022 * 10 molecules of oxygen = 32g of oxygen
2) 6.022 * 10 ions of sodium = 23g of sodium
3) 6.022 * 10 atoms of C = 24g of carbon 4) 6.022 * 10 atoms of H = 1g of hydrogen atoms
Diamond is lustrous because
1) it is colourless 2) it is hard
3) it is pure
4) its refractive index is high
CO can be easily liquified and even solidified because
1) It has weak forces of attraction
2) It has comparatively more force of attraction than other gases
3) It has more intermolecular space
4) It is present in atmosphere.
Which of the following is most suitable for summer?
y Cotton
2) Nylon
3) Polyester
4) Silk
The colour of vapours formed on sublimation of iodine solid is
1) Purple (violet) Colourless 3) Yellow
4) Orange
Which of the following is not endothermic process?
1) Fusion
2) Vapourisation 3) Temperature 4) Insoluble heavy impurities
1 carat of diamond is equal to
1) 200 mg
2) 2009
3) 100 mg
4) 100 g
Which of the following does not affect rate of evaporation?
1) Wind speed 2) Surface area 3) Temperature 4) Insoluble heavy impurities
Kinetic energy of molecules is directly proportional to
1) Temperature 2) Pressure
3) Both 1 and 2 4) Atmospheric pressure
The components of water can be separated by
1)Physical methods 2) Chemical methods 3) Both 1 & 2 4)They can't be separated
Mixture can be
1) homogeneous 2) heterogeneous 3) Both 1 and 2 4) pure substance
Brass is a
2) Element
3) Homogeneous mixture 4) Heterogeneous mixture​

Answer 1

Answer:

ouestion number 4 ka ha elements