Cuprous compounds such as CuCI, CuCN and CuSCN are the only salts stable in H2O due to
high hydration energy of Cu+ ions
their inherent tendency not to disproportionate
diamagnetic nature
insolubility in water
Which one of the following forms a colourless solution in aqueous medium?(Atomic number: Sc = 21, Ti = 22, V = 23, cr = 24)
V3+
Cr3+
Ti3+
Sc3+
More number of oxidation states are exhibited by the actinides than by the lanthanides. The main reason for this is
More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
Lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
Greater metallic character of the lanthanides than that of the corresponding actinides
More active nature of the actinides
The common oxidation states of Ti are
+2,+3
+3,+4
3,-4
+2, +3, +4
The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is
lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
larger atomic size of actinides than the lanthanides
more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
greater reactive nature of the actinides than the lanthanides
Photographic plates and films have an essential ingredient of
Silver nitrate
Silver bromide
Sodium chloride
Oleic acid
Identify the incorrect statement among the following.
There is a decrease in the radii of the atoms or ions as one proceeds from La or Lu
Lanthanide contraction is the accumulation of successive shrinkages
As a result of lanthanide contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements
Shielding power of 4 f electrons is quire weak
Which of the following statement is not correct?
La(OH)3 is less basic than Li(OH)3
In lanthanide series ionic radius of Ln3+ ion decreases
La is actually an element of transition series rather lanthanide
Atomic radius of Zr and Hf are same because of lanthanide contraction
Which one of the following elements shows maximum number of different oxidation states in its compounds?
Eu
La
Gd
Am
In which of the following pairs are both the ions coloured in aqueous solution?
CuCN
[Cu(CN)4]3-
[Cu(CN)4]2-
Cu(CN)2
