Which of the following elements is responsible for oxidation of water to O2 in biological processes?
Fe
Cu
Mn
Mo
The aqueous solution containing which one of the following ions will be colourless?
(At no: sc = 21, Fe = 26, Ti = 22, Mn = 25)
Sc3+
Fe2+
Ti3+
Mn2+
____________ is a blend of metals prepared by mixing the components.
Alloy
Metals
Non metal
Metalloid
In which of the following compounds transition metal has zero oxidation state?
[Fe(CO)5]
NH2.NH2
NOCIO4
CrO5
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+
Mn3+
Among the lanthanides the one obtained by synthetic method is
Lu
Pm
Pr
Gd
Photographic plates and films have an essential ingredient of
Silver nitrate
Silver bromide
Sodium chloride
Oleic acid
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
Which of the following metals corrodes readily in moist air?
Gold
Silver
Nickel
Iron
________ compounds are those which are formed when small atoms like H,C, or N are trapped inside the crystal lattices of metals.
metallic
ionic
co-ordinate
interstitial