Among the following series of transition metal ions, the one in which all metal ions have 3d2 electronic configuraiton is : (At no : Ti = 22; V = 23; Cr = 24; Mn = 25)
Ti3+, V2+, Cr3+, Mn4+
Ti+, V4+, Cr6+, Mn7+
Ti4+, V3+, Cr2+, Mn3+
Ti2+, V3+, Ci4+, Mn5+
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 one one of the following ionic species will impart colour to an aqueous solution?
Ti4+
Cu+
Zn2+
Cr3+
K2Cr2O7 on heating with aqueous NaOH gives
CrO2-4
Cr(OH)3
Cr2O2-7
Cr(OH)2
Which one of the following forms a colourless solution in aqueous medium?(Atomic number: Sc = 21, Ti = 22, V = 23, cr = 24)
V3+
Ti3+
Sc3+
The oxidation state of Cr in K2Cr2O7 is
+5
+3
+6
+7
The transition elements have a general electronic configuraiton
ns2np6nd1-10
(n-1)d1-10, ns0-2, np0-6
(n-1)d1-10, ns1-2
nd1-10ns2
While extracting element from its ore, the ore is grind and leached with dil KCN solution to form the soluble product potassium argentocyanide. The element is
lead
chromium
manganese
silver
Which of the following may be considered to be an organometallic compound?
Nickel tetracarbonyl
Chlorophyll
K3[Fe(C2O4)3]
[Co(en)3]CI3
Copper sulphate dissolve in excess of KCN to give
CuCN
[Cu(CN)4]3-
[Cu(CN)4]2-
Cu(CN)2