Blue colour of water in sea is due to :
refraction of blue light by impurities in sea water
refraction of blue sky by water
scattering of light by impurities
All of the above
The rate of a reaction is primarily determined by the slowest step .This step is called :
rate determining step
reaction rate
activation step
None of the above
HCl is a gas but HF is a low boiling liquid .This is because :
H-F bond is strong
H-F bond is weak
molecules aggregate because of hydrogen bonding
HF is a weak acid
C.
molecules aggregate because of hydrogen bonding
HF is a low boiling liquid due to the presence of hydrogen bonding in the molecules .Due to hydrogen bonding in HF molecules it exist as associated molecules (HF)n
or , (HF)n
HCl is a gas due to absence of hydrogen bonding in it's molecules .
Hydrogen bond is formed between H-atom and most electronegative atom (like , N , 0 and F)
Ostwald process is used for the manufacture of :
nitric acid
sulphuric acid
ammonia
bleaching powder
For a dilute solution , Raoult's law states that :
the lowering of vapour pressure is equal to mole fraction of solute
the relative lowering of vapour pressure is equal to mole fraction of solute
the relative lowering of vapour pressure is proportional to the amount of solute in solution
the vapour pressure of the solution is equal to the mole fraction of solvent
A gaseous mixture contains 56 g N2 , 44 g CO2 and 16 g CH4 .The total pressure of the mixture is 720 mm Hg .What is the partial pressure of CH4 ?
142 mm
156 mm
182 mm
180 mm