Which of the following metal is the main constituents of haemoglobin?
Fe (Iron) is the main constituent of haemoglobin. It helps in carrying oxygen to the cells.
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg (b) Hg and Mg (c) Na and Mg (d) Cu and Fe
Which metal is considered best for protecting the other metal?