The halogens form a series of compounds with each other, which are called interhalogens. examples are bromine chloride (brcl), iodine bromide (ibr), bromine fluoride (brf), and chlorine fluoride (clf). which is expected to have the lowest boiling point?

Chlorine fluoride is expected to have the lowest boiling point.

Explanation:

Interhalogens have covalent bonds, and as such, the higher the difference in electronegativity, the higher the expected boiling point will be.

Looking at the Periodic Table of elements, we can see that in these four examples, the compound with the lowest electronegativity difference -and thus the lowest boiling point-, is chlorine fluoride, ClF.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.