The highest magneticmoment is shown by the transition metal ion with the configuration :
3d2
3d5
3d7
3d9
In which of the following complex ion, the central metal ion is in a state of sp3d2 hybridisation?
[CoF6]3-
[Co(NH3)6]3+
[Fe(CN)6]3-
[Cr(NH3)6]3+
The concentration of a reactant X decreases from 0.1 M to 0.005 Min 40 minute. If the reaction follows 1 order kinetics, the rate of the reaction when the concentration of X is 0.01 M will be :
1.73 × 10-4 M min-1
3.47 × 10-4 M min-1
3.47 × 10-5 M min-1
7.5 × 10-5 M min-1
When a quantity of electricity is passed through CuSO4 solution, 0.16 g of copper gets deposited. If the same quantity of electricity is passed through acidulated water, then the volume of H2 liberated at STP will be : [given : atomic weight of Cu = 64]
4.0 cm3
56 cm3
604 cm3
8.0 cm3
Which one of the following condition will increase the voltage of the cell represented by the equation?
Cu(s) + 2Ag+(aq) Cu2+(aq) + 2Ag(s)
Increase inthe dimension of Cu electrode
Increase in the dimension of Ag electrode
Increase inthe concentration of Cu2+ ion.
Increase in the concentration of Ag+ ions.
The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is:
1g
3g
6g
18g
Which of the following electrolyte will have maximum flocculation value for Fe(OH)3 sol?
NaCl
Na2S
(NH4)3PO4
K2SO4
The radii of Na+ and Cl- ions are 95 pm and 181 pm respectively. The edge length of NaCl unit cell is :
276 pm
138 pm
552 pm
415 pm
C.
552 pm
NaCl has Fcc structure.
In fcc lattice r+ + r- = a/2
where a= edge length
r+ = 95pm r-= 181pm
Edge length =2r+ + 2r-= (2 × 95+2 × 181)pm
=190 + 362= 552 pm
The formula mass of Mohr's salt is 392. The iron present in it is oxidised by KMnO4 in acid medium. The equivalent mass of Mohr's salt is :
392
31.6
278
156