The colour of the flame of sodium is
deep red
blue
green
golden yellow
D.
golden yellow
In flame test, sodium burns with golden yellow flame.
Formula of hexaaqua manganese (II) phosphate is
[Mn(H2O)]6PO4
[Mn(H2O)6]3PO4
[Mn(H2O)6]3(PO4)2
[Mn(H2O)6](PO4)3
Which transition element of the following outermost electronic configuration shows the highest oxidation state?
3d3, 4s2
3d5, 4s1
3d5, 4s2
3d6, 4s2
Which of the following is not a method of preparation of colloidal solution?
Electrical dispersion
Peptization
Coagulation
Mechanical dispersion
The standard reduction potential E° for half-reactions are
Zn → Zn2+ + 2e- ; E° = +0.76 V
Fe → Fe2+ + 2e- ; E° = +0.41 V
The EMF of the cell reaction
Fe2+ + Zn → Zn2+ + Fe is
+1.28 V
-1.28 V
+0.35 V
-0.35 V
The lanthanoid contraction is responsible for the fact that
Zn and Y have about same radius
Zr and Nb have similar oxidation states
Zr and Hf have about the same radius
Zr and Zn have the same oxidation state