Aqueous solution of ferric chloride is acidic due to

• ionization

• polarization

• dissociation

• hydrolysis

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

503.

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

Which of the following is the weakest acid?

• HCl

• HF

• H₂SO₄

• HNO₃

Which of the following contains greatest number of oxygen atoms ?

• 1 g of O

• 1 g of O₂

• 1 g of O₃

• All have the same number of atoms

Bleaching powder is obtained by the interaction of chlorine with

• concentrated solution of calcium hydroxide

• dilute solution of calcium hydroxide

• dry calcium oxide

• dry slaked lime

The formula of haematite is

• Fe₃O₄

• Fe₂O₃

• FeCO₃

• FeS₂

Hypo is used in photography due to its

• reaction with light

• reducing property

• oxidising property

• complex forming nature