Mercury is the only metal which is liquid at 0Â°C. this is due to its
The general electronic configuration of transition elements is
A transition element X has a configuration [Ar]3d4 in its + 3 oxidation state. Its atomic number is
The lanthanide conctraction is responsible for the fact that
The aqueous solution containing which one of the following ions will be colourless
The correct order of ionic radii of Y3- , La3+ ,Eu3+ and Lu3+ is
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
Which one of the following characteristic of the transition metals is associated with their catalytic activity
Among the following series of transition metal ions, the one in which all metals ions have 3d2 electronic configuration is
Which of the following ionic species will impart colour to an aqueous solution
A metal gets coated with a green basic carbonate when exposed at atmosphere. Metal is
the outer electron configuration of Gd (At. No. 64) is
Which of the following in Rinmanns green?
The colour of transition metal compound is due to
Which one of these is not known?
Hair dyes contain
Which belongs to the actinides series ?
Which of the following has the maximum number of unpaired d-electrons?
Least paramagnetic property is shown by
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 ?
Brass is an alloy of Cu with
Metal ion responsible for the Minamata disease is
Paramagnetism is exhibited due to which one of the following reason?
The catalytic activity of the transition metals and their compounds is described to
Green vitriol is
Anhydrous ferric chloride is prepared by
The element which forms ions in dimeric state is
Silver, gold, platinum, iron, copper and titanium are part of the
The colour of Cu 2+/2 containing salt is
German silver alloy contains
Why d-block element form complexes?
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?
The colour of light absorbed by an aqueous solution of CuSO4 is
Silver iodide is used for producing artificial rain because AgI
A red solid is insoluble in water. However it becomes soluble if
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