How does the ionisation energy of 1st group elements vary ?

• Increases down the group

• Decreases down the group

• Remains unchanged

• Variation is not regular

Which among the following elements have lowest value of IE₁ ?

• Pb

• Sn

• Si

• C

The compound insoluble in water is

• mercurous nitrate

• mercuric nitrate

• mercurous chloride

• mercurous perchlorate.

Which of the following element is a metalloid ?

• Bi

• Sn

• Ge

• C

Hydrogen in respect to chlorine, is :

• electropositive

• electronegative

• neutral

• none of the above

The first ionisation potential is maximum for :

• B

• N

• O

• Be

Dominance of strong repulsive forces among the molecules of the gas (Z = compressibility factor)

• depends on Z and indicated by Z = 1

• depends on Z and indicated by Z > 1

• depends on Z and indicated by Z < 1

• is independent of Z.

The liquefied metal expanding on solidification is

• Ga

• Al

• Zn

• Cu.

Which of the follownig elements, is most electronegative ?

• F

• O

• Ne

• Na

Which of the following elements never show positive oxidation number ?

• O

• Fe

• Ga

• F