The properties of Zr and Hf are same because :
they have similar radii
they belong to d-block
they have same valence electrons
None of the above
Formation of coloured solution is possible when metal ion in the compound contains :
paired electrons
lone pair of electrons
unpaired electrons
None of the above
In the periodic table metals usually used as catalysts belong to :
f - block
d - block
p - block
s - block
In a neutron induced reaction of , the product obtained is , three neutrons and an element (new nuclide) .The other new nuclide is :
The lanthanide contraction is responsible for the fact that :
Zr and Zn have the same oxidation state
Zr arid Hf have about the same radius
Zr and Nb have similar oxidation state
Zr and Y have about the same radius
The atomic number of Ni and Cu are 28 and 29 respectively .The electronic configuration 1s , 2s2 2p6 , 3s2 3p6 3d10 represents :
Cu+
Cu2+
Ni2+
Ni
Assertion : Transition metals are poor reducing agents.
Reason : Transition metals form numerous alloys
with other metals.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
B.
If both assertion and reason are true but reason is not the correct explanation of assertion.
In actual practice transition metals react with acid very slowly and act as poor reducing agents. This is due to the protection of metal as a result of formation of thin oxide protective film. Further, their poor tendency as reducing agent is due to high ionisation energy, high heat of vapourization and low heat of hydration.
Assertion : The degree of complex formation in actinides decreases in the order .
Reason : Actinides form complexes with p-bonding ligands such as alkyl phosphines and thioethers.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.