Short Answer TypeWhat are the conditions for hydrogen bonding?
These are:
(i) Hydrogen atom should be bonded to highly electronegative atom (N, O, F). The strength of the hydrogen bond increases with an increase in the electronegativity of the other atom. For example, the electronegativity of N, O, F increases as N < O < F.
Therefore, strength of hydrogen bond also increases as,
N – H ... N < O – H ... O < F – H ... F
(ii) The size of the electronegative atom should be small. Smaller the size of the atom, more the electrostatic force of attraction, stronger will be the hydrogen bond.
Nitrogen and chlorine have the same electronegativity but only former shows intermolecular hydrogen bonding. Discuss.
Long Answer TypeGive reasons for the following:
(i) The density of water is maximum at 277 K (4°C).
(ii) Why glycerol (glycerine) is more viscous than ethyl alcohol?
Short Answer TypeCalcualte the total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of 1 dm3 at 
. R = 0.083 bar dm3 K-1 mol-1.
A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.
Multiple Choice QuestionsIf average velocity of a sample of gas molecules at 300 K is 5 cm s-1, what is RMS velocity of same sample of gas molecules at the same temperature? (Given, α: u: v = 1:1.224: 1.127)
6.112 cm/s
4.605 cm/s
4.085 cm/s
5.430 cm/s
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