51.

Water is a

• amphoteric acid

• aprotic solvent

• protophobic solvent

• protophilic solvent

Alum is a water purifier because it

• coagulates the impurities

• softens hard water

• gives taste

• destroys the pathogenic bacteria

A commercial sample of hydrogen peroxide is labelled as is volume. Its percentage strength is nearly

• 1%

• 3%

• 10%

• 90%

The maximum number of hydrogen bonds that a molecule of water can have is

• 1

• 2

• 3

• 4

In the reaction, 2FeSO₄ + H₂SO₄ + H₂O₂ → Fe₂(SO₄)₃ + 2H₂O the oxidising agent is

• FeSO₄

• H₂SO₄

• H₂O₂

• methyl cyclopentane

H₂O₂ cannot oxidise

• PbS

• Na₂SO₃

• O₃

• KI

Water softening by Clark's process uses

• CaHCO₂

• NaHCO₃

• Na₂CO₃

• Ca(OH)₂

Pick the correct statement among the following statement.

• Sodium dodecyl benzene sulphonate used in tooth paste ts a cationic detergent

• Non-ionic detergents is formed when polyethylene glycol reacts with adipic acid

• Cetyl trimethyl ammonium bromide is a popular cationic detergent used in air conditioner

• Sodium lauryl sulphate forms an insoluble scum with hard water

In the manufacture of hydrogen from water gas (CO + H₂), which of the following is correct statement?

• CO and H₂ are separated based on difference in their densities

• H₂ is removed by occlusion with Pd

• CO is oxidised to CO₂ with steam in the presence of a catalyst followed by absorption of CO₂ alkali

• Hydrogen is isolated by diffusion

H₂ cannot he displaced by :

• Li⁺

• Sr²⁺

• Al³⁺

• Ag⁺