HARDMCQ SINGLENEET ChemistryInorganic Chemistrys- Block 3.0Achiever Section
Which of the following statements(s) is/are incorrect regarding the s-block elements? I. Francium is highly radioactive element. II. Oxides and hydroxides of alkali metals and alkaline earth metals are not alkaline in nature. III. Sodium and potassium are the only two s-block elements are found in large proportion in biological fluids. IV. Biological function of s-block elements is due to maintenance of ion balance and nerve impulse condition.
A.Only I
B.II and III
C.II and III✓ Correct
D.Only III
Explanation
Statement II and II are incorrect, because Oxides and hydroxides of alkaline earth metals and alkali metal are alkaline in nature. Apart from Na and K, Ca and Mg are also found in biological fluid.
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