The correct order of ionic radii of Y3- , La3+ ,Eu3+ and Lu3+ is
A transition element X has a configuration [Ar]3d4 in its + 3 oxidation state. Its atomic number is
The aqueous solution containing which one of the following ions will be colourless
The general electronic configuration of transition elements is
The lanthanide conctraction is responsible for the fact that
Which of the following has the maximum number of unpaired d-electrons
The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding Lanthanoids
Among the following series of transition metal ions, the one in which all metals ions have 3d2 electronic configuration is
A metal gets coated with a green basic carbonate when exposed at atmosphere. Metal is
Which one of the following characteristic of the transition metals is associated with their catalytic activity
Which of the following ionic species will impart colour to an aqueous solution
the outer electron configuration of Gd (At. No. 64) is
The colour of transition metal compound is due to
Which of the following in Rinmanns green?
Hair dyes contain
Which one of these is not known?
Which belongs to the actinides series ?
Green vitriol is
Anhydrous ferric chloride is prepared by
A red solid is insoluble in water. However it becomes soluble if
Brass is an alloy of Cu with
Least paramagnetic property is shown by
Metal ion responsible for the Minamata disease is
The catalytic activity of the transition metals and their compounds is described to
In chromite ore, the oxidation number of iron and chromium are respectively
The spin only magnetic moment of Fe^2+ ion (in BM) is approximately
Copper exhibits only + 2 oxidation state in its stable compounds. Why ?
The colour of light absorbed by an aqueous solution of CuSO4 is
German silver alloy contains
The element which forms ions in dimeric state is
Which of the following has the maximum number of unpaired d-electrons?
Paramagnetism is exhibited due to which one of the following reason?
Silver, gold, platinum, iron, copper and titanium are part of the
The colour of Cu 2+/2 containing salt is
Which one of the following transition element has the lowest value of enthalpy of atomisation?
What is the ground state electron configuration of the Mn ^2+ ion?
Why d-block element form complexes?
Silver iodide is used for producing artificial rain because AgI
the colour of KMno4 is due to
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