Which of the following metals corrodes readily in moist air?
Gold
Silver
Nickel
Iron
Which one of the following elements shows maximum number of different oxidation states in its compounds?
Eu
La
Gd
Am
Stainless steel contains iron and
Cr + Ni
Cr + Zn
Zn + pb
Fe + Cr + Ni
The lanthanide contraction is responsible for the fact that
Zr and Yt have about the same radius
Zr and Nb have similar oxidation state
Zr and Hf have about the same radius
Zr and Zn have the same oxidation state
Photographic plates and films have an essential ingredient of
Silver nitrate
Silver bromide
Sodium chloride
Oleic acid
K2Cr2O7 on heating with aqueous NaOH gives
CrO42-
Cr(OH)3
Cr2O72-
Cr(OH)2
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
The most durable metal plating on iron to protect against corrosion is
Nickel plating
Tin plating
Copper plating
Zinc plating
Actinides
are all synthetic elements participate.
Include element 104
have any short lived isotopes
have variable valency
Which one of the following is an ore of silver?
Argentite
Stibnite
Haematite
Bauxite
