☰
The s-Block Elements
Explain the significance of magnesium and calcium in biological fluids.
Significance of magnesium and calcium:
(i) Magnesium is an important constituent of chlorophyll which initiates the process of photosynthesis in green plants.
(ii) Magnesium ions are concentrated more in intracellular than in extracellular fluids in animal bodies. Their presence is also necessary for the activation of phosphate-transfer enzymes. These enzymes take part in the biochemical process (exothermic) occurring in animal body. Mg2+ ions are also involved in carbohydrates metabolism.
(iii) Ca2+ ions are essential for the formation of bones and teeth. The enamel on teeth is a double salt 3Ca3(PO4)2.CaF2.
(iv) Mg2+ and Ca2+ ions are also involved in the transmission of electrical impulses along the nerve fibre and for the contraction of muscles.
Sponsor Area
Why caesium can be used in photoelectric cell while lithium can not be?
In aqueous solution, Li+ ion has lowest mobility. Why?
Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.
The softness of group 1 elements increases down the group with increasing atomic number. Give reason.
Which is the most reactive alkali metal and why?
Why alkali metals do not form M2+ ions?
Name the radio active element in group 1. How does it resemble with the remaining elements of the group?
Why alkali metals are normally kept in kerosene oil?
Why lithium cannot be stored in kerosene?
Why does lithium form complexes?
Sponsor Area
Sponsor Area