Answer:
(a) An element which is
soft and reactive metal is sodium (Na) potassium (K) as alkali metals are soft
and reactive.
(b) Limestone is
calcium carbonate CaCO3. The important constituent of limestone is calcium
(Ca).
(c) Metal
which exists in liquid state at room temperature is mercury (Hg) So the increasing
order of their reactivity
Mercury < Calcium
< Sodium
or Hg
< Ca < Na.
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