The element having highest electron affinity is :

• bromine

• iodine

• fluorine

• chlorine

The correct order according to size is :

• O > O^- > O^2-

• O^- > O^2- >O

• O^2- >O^- > O

• O > O^2- >O^-

pH of a 0.0001M HCl solution is

• 4.0

• 2.0

• 6.0

• 7.0

Pb reacts with dilute HNO₃ produces:

• NO

• NH₄NO₃

• N₂O₅

• NO₂

End-product of the hydrolysis of XeF₆ is:

• XeF₄O

• XeF₂O₂

• XeO₃

• XeO${}_3^{-}$

Aqueous solution of ferric chloride is acidic due to

• ionization

• polarization

• dissociation

• hydrolysis

1087.

The correct order of heat of formation of halogen acids is

• HI > HBr > HCl > HF

• HF > HCl > HBr > HI

• HCl > HF > HBr > HI

• HCl > HBr > HF > HI

The hydroxide insoluble in NH₄OH + NH₄Cl is

• Al(OH)₃

• Ca(OH)₃

• Zn(OH)₂

• Mg(OH)₂

Precipitate of AgCl is soluble in liquid NH₃ the compound forms

• Ag(NH₄)₂OH

• Ag(NH₄)₂Cl

• Ag(NH₃)₂OH

• Ag(NH₃)₂Cl

In qualitative analysis, in III group NH₄Cl is added before NH₄OH because

• to increase the concentration of NH${}_4^{+}$ ions

• to increase the concentration of Cl^- ions

• to reduce the concentration of OH^- ions

• to increase the concentration of OH^- ions