The freezing point depression of 0.001 m Kx[Fe(CN)6] is 7.1x 10-3 K. The value of x will be [Given, Kf = 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 I Br
Potential Ev = 1.19 V Ev = 1.741
Potential Ev / V
Cl > I < Br
I > Br < Cl
Br < I < Cl
Br < Cl < I
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
C.
monocentric complex is converted into dicentric complex
On acidification of potassium chromate solution, yellow colour changes to orange colour due to reformation of dichromate. This suggests that monocentric complex i.e., potassium monochromate converted into dicentric complex i.e potassium dichromate solution.
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
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