H₂O₂ cannot oxidise

• PbS

• Na₂SO₃

• O₃

• KI

Water softening by Clark's process uses

• CaHCO₂

• NaHCO₃

• Na₂CO₃

• Ca(OH)₂

223.

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⁺

Water possesses a high dielectric constant, therefore:

• it always contains ions

• it is a universal solvent

• can dissolve covalent compounds

• can conduct electricity

The value of the ionic product of water depends:

• on volume of water

• on temperature

• changes by adding acid or alkali

• always remain constant

Heavy water is:

• water containing Fe, Cr, Mn

• water at 0°C

• D₂O

• water obtained after distillation

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

• generate heat

• create potential difference between the two electrodes

• produce high purity water

• remove adsorbed oxygen from electrode surfaces

Which one of the following will dissolve in water most readily?

• I₂

• BaCO₃

• KF

• PbI₂