Advertisements
Advertisements
Question
Explain why \[\ce{HCl}\] is a gas and \[\ce{HF}\] is a liquid.
Advertisements
Solution
Due to greater electronegativity of \[\ce{F}\] over \[\ce{Cl, F}\] forms stronger \[\ce{H}\] – bonds as compared to \[\ce{Cl}\]. As a result, more energy is needed to break the \[\ce{H}\] – bonds in \[\ce{HF}\] than in \[\ce{HCl}\] and hence the b.p. of \[\ce{HF}\] is higher than that of \[\ce{HCl}\]. Consequently, \[\ce{H - F}\] is liquid while \[\ce{HCl}\] is a gas at room temperature.
APPEARS IN
RELATED QUESTIONS
Arrange the following:
CaH2, BeH2 and TiH2 in order of increasing electrical conductance.
What properties of water make it useful as a solvent? What types of compound can it (i) dissolve, and (ii) hydrolyse?
Explain the picture in your own words.
Why is the density of seawater more than that of rain water?
Define the following.
Boiling point
Which of the following equation depicts reducing nature of \[\ce{H2O2}\]?
Some of the properties of water are described below. Which of them is/are not correct?
(i) Water is known to be a universal solvent.
(ii) Hydrogen bonding is present to a large extent in liquid water.
(iii) There is no hydrogen bonding in the frozen state of water.
(iv) Frozen water is heavier than liquid water.
\[\ce{H2O2}\] is a better oxidising agent than water. Explain.
Melting point, enthalpy of vapourisation and viscosity data of \[\ce{H2O}\] and \[\ce{D2O}\] is given below :
| \[\ce{H, O}\] | \[\ce{D2O}\] | |
| Melting point / K | 373.0 | 374.4 |
| Enthalpy of vapourisation at (373 K)/kJ mol–1 | 40.66 | 41.61 |
| Viscosity/centipoise | 0.8903 | 1.107 |
On the basis of this data explain in which of these liquids intermolecular forces are stronger?
The freezing point of water ______ with an increase in pressure.
Pure water boils at ______ °C at one atmospheric pressure.
______ has the highest latent heat of fusion.
Water is circulated around the car engine using the ______ pump and the heat is absorbed.
What is the taste of distilled water & boiled water?
What are the physical properties of pure water?
Which of the following ion is responsible for the temporary hardness of water?
The water having more dissolved O2 is ______.
