Which of the following statements is/are incorrect regarding the s-block elements?
I. Francium is highly radioactive element.
II. Oxides and hydroxides of alkali metals and alkaline alkaline earth metals are not alkaline earth metals are not alkaline in nature.
III. Sodium and potassium are the only two s-block elements which are found in large proprtion in biological fluids.
IV. Biological function of s-block elements is due to maintanance of ion balance and nerve impulse condition.

Options

A. Only I
B. I and III
C. II and III
D. Only III

Answer

c

Explanation

Statements II and III are incorrect because oxides and hydroxides of alkaline earth metals and alkali metals are alkaline in nature. Apart from Na and K, Ca and Mg are also found in biological fluid.