Brass is an alloy of copper and
tin
lead
zinc
mercury
F- block elements are also known as ___________ elements
transition
inner transition
alkali
alkaline earth
Ions with _________ configuration are colourless in nature.
d1
d3
d5
d10
Which one of the following elements shows maximum number of different oxidation states in its compounds?
Eu
La
Gd
Am
Lanthanides are
14 elements in the sixth period (at no = 90 to 103) that are fillings 4 f sub-level
14 elements in the seventh period (at no = 90 to 103) that are filling 5f sub level
14 elements in the sixth period (at no = 58 to 71) that are filling 4f sub-level
14 elements in the seventh period (at no = 58 to 71) that are filing 4f sub- level
The transition elements have a general electronic configuration
ns2np6nd1-10
(n-1)d1-10, ns0-2, np0-6
(n-1)d1-10, ns1-2
nd1-10ns2
________ is used as a catalyst in Haber process.
finely divided iron
vanadium (v) oxide
nickel
copper chloride
When (NH4)2Cr2O7 is heated, the gas evolved is
N2
NO2
O2
N2O
Of the following transition metals, the maximum number of oxidation states are exhibited by
chromium (Z = 24)
manganese (Z = 25)
iron (Z = 26)
titanium (Z = 22)
Which one of the following ions is the most stable in aqueous solution?
(At no Ti = 22, V = 23, Cr = 24, Mn = 25)
Cr3+
V3+
Ti3+
Mn3+
