21.

Which one of the following is not a common component of photochemical smog?

• Ozone

• Acrolein

• Peroxyacetyl nitrate

• Peroxyacetyl nitrate

If a is the length of the side of a cube, the distance between the body centred atom and one corner atom in  the cube will be

Which property of colloids is not dependent on the charge on colloidal particles?

• Coagulation

• Electrophoresis

• Electro-osmosis

• Electro-osmosis

Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?

• KCl

• C₆H₁₂O₆

• Al₂(SO₄)₃

• Al₂(SO₄)₃

When 0.1 mol MnO₄^2- is oxidised, the quantity of electricity required to completely oxidise MnO₄^2- to MnO₄^2- is

• 95600C

• 2 x 96500C

• 9650 C

• 9650 C

Using the Gibbs energy change, ΔG⁰ = +63.3 KJ for the following reaction,
Ag₂CO₃ (s) r2Ag⁺ (aq) + CO₃^2- (aq)
the Ksp of Ag₂CO₃ (s) in water at 25⁰ C is (R= 8.314 JK^-1 mol^-1)

• 3.2 x 10^-26

• 8.0 x 10^-12

• 2.9 x 10^-3

• 2.9 x 10^-3

The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O₂ at STP will be

• 5.4 g

• 10.8 g

• 54.0 g

• 54.0 g

Acidity of diprotic acids in aqueous solutions increases in the order

• H₂S < H₂Se< H₂Te

• H₂Se <H₂S <H₂Te

• H₂Te <H₂S < H₂Se

• H₂Te <H₂S < H₂Se

In acidic medium,H₂O₂ changes Cr₂O₇^2- to CrO₅ which has two (-O-O-) bonds. Oxidation state of Cr in CrO₃ is 

• +5

• +3

• +6

• +6

Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is

• [Mn(H₂O)₆]³⁺

• [Fe(H₂O)₆]³⁺

• [Co(H₂O)₆]³⁺

• [Co(H₂O)₆]³⁺