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Coinage alloy has the composition of:
Ag + Cu + Ni
Au + Ag + Cu
Au + Zn + Ag
Ag + Fe + Cu
Which of the following is used for sterilization of surgical instruments?
Boiling water
Iodine
Dry heat
Autoclaving
Rusting of iron in moist air involves:
Loss of electrons by Fe
Gain of electrons by Fe
Neither gain nor loss of electrons
Hydration of Fe
A chocolate brown coloured compound with acetic acid and potassium ferrocyanide is obtained from a salt solution containing:
Cu
Cd
Sn
Hg
Which lanthanoid compound is used as a most powerful liquid lasers after dissolving it in selenium oxychloride?
Cerium oxide
Neodymium oxide
Promethium sulphate
Ceric sulphate
A transition metal ion exists in its highest oxidation state. It is expected to behave as
A chelating agent
A central metal in a coordination compound
An oxidising agent
A reducing agent
For -block elements the first ionisation potential is of the order
{\rm{Zn\;}} > Fe > \;Cu > Cr
{\rm{Sc\;}} = {\rm{Ti\;}} < V\; = Cr
{\rm{Zn}} < Cu < Ni < Co
{\rm{V}} > \;Cr > Mn > Fe
Automobile engine blocks are made up of:
Stainless steel
Nickel-chromium steel
Cast iron
Wrought iron
