The freezing point depression of 0.001 m K_x[Fe(CN)₆] is 7.1x 10^-3 K. The value of x will be [Given, K_f = 1.86 KKg mol^-1 for water].

• 2

• 4

• 3

• 1

Three ampere currernt was passed through an aqueous solution of an unknown salt of Pd for 1 h 2.977 g of Pdⁿ⁺ was deposited at cathode.The value of n is:

(given at wf of Pd= 106.4)

• 6

• 5

• 4

• 3

The variation of adsorption of N, on charcoal with pressure at different constant temperature can be represented by :

The correct increasing order of temperature
T₁ , T₂ and T₃ is :

• T₁ < T₂ < T₃

• T₂ < T₃ < T₁

• T₃ < T₂ < T₁

• T₂ < T₁ < T₃

Reduction potential of some ions are given below:

Arrange them in decreasing order of oxidising power.

Ions Reduction : Cl${\mathrm{O}}_4^{-}$ I${\mathrm{O}}_4^{-}$ Br${\mathrm{O}}_4^{-}$

Potential E^v = 1.19 V   E^v = 1.741

Potential E^v / V

• Cl${\mathrm{O}}_4^{-}$ > I${\mathrm{O}}_4^{-}$ < Br${\mathrm{O}}_4^{-}$

• I${\mathrm{O}}_4^{-}$ > Br${\mathrm{O}}_4^{-}$ < Cl${\mathrm{O}}_4^{-}$

• Br${\mathrm{O}}_4^{-}$ < I${\mathrm{O}}_4^{-}$ < Cl${\mathrm{O}}_4^{-}$

• Br${\mathrm{O}}_4^{-}$ < Cl${\mathrm{O}}_4^{-}$ < I${\mathrm{O}}_4^{-}$

The coordination number of Fe[Fe(CN)₆]^4- , [Fe(CN)₆]^3- and [FeCl₄]^- respectively:

• 6 , 3 , 3

• 6 , 4 , 6

• 6 , 6 , 4

• 2 , 3 , 3

The metal which can displace all other metals from their salt solution among the following is:

• Al

• Zn

• Cu

• Fe

Yellow colour of aqueous solution of potassium chromate changes to orange if dil. H₂SO₄ is added. It indicates:

• chromate ions are reduced

• chromate ions are oxidised

• monocentric complex is converted into dicentric complex

• oxygen gets removed from chromate ions

There is a steam of neutrons with a kinetic energy of 0.0327 eV. If the half life of neutrons s 700 s, what fraction of neutrons will decay before they travel a distance of 10 km?

• 0.001

• 0.004

• 0.006

• 0.009

49.

One of the hazardous explosion is the generation of ⁹⁰Sr and its subsequent incorporation in bones. This nuclide has a half life of 28.1 years. Suppose one microgram was absorbed by a new born child. How much ⁹⁰Sr will remain in his bones after 20 years?

• 0.061 µg

• 0.080µg

• 0.050µg

• 0.030µg

Identify the correct decreasing order of acidity of the given carboxylic acid.