) Which of the below statements is not true? A) The radius of H- ion is greater than that of He atom. B) He has the highest first ionization energy among all the elements. C) F does not show positive oxidation states. D) 𝑂(𝑔)+𝑒−⟶𝑂−(𝑔) is an exothermic process. E) Si has more metallic characteristics than Al.

Which of the following statements are not correct?A. The electron gain enthalpy of FF is more negative than that of Cl.Cl.B. Ionization enthalpy decreases in a group of periodic table.C. The electronegativity of an atom depends upon the atoms bonded to it.D. Al2O3Al2O3 and NONO are examples of amphoteric oxides.Choose the most appropriate answer from the options given below:

Which one of the following is false? Chlorine (Z=17) has a smaller radius than aluminum (Z=13). Carbon (Z=6) has a higher first ionization energy than boron (Z=5). Potassium (Z=19) has a higher electron affinity than sodium (Z=11). Beryllium (Z=4) has a larger radius than carbon (Z= 6). Chlorine (Z=17) is more electronegative than iodine (Z=53).

Three statements about potassium and chlorine and their ions are listed.3The atomic radius of a potassium atom is greater than the atomic radius of a chlorineatom.1The first ionisation energy of potassium is greater than the first ionisation energy ofchlorine.2The ionic radius of a potassium ion is greater than the ionic radius of a chloride ion.3Which statements are correct?

Statement I: The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.Statement II: The d orbitals in Ga are completely filled.In the light of the above statements, choose the most appropriate answer from the options given belowStatement I is incorrect but statement II is correct.Both the statements I and II are correctStatement I is correct but statement II is incorrectBoth the statements I and II are incorrect

Which of the following statements is/are true?(a) Mercury exists as solid at room temperature(b) Metals like gallium and caesium have very high melting points(c) Iodine is a lustrous non-metal(d) Lithium and potassium have low densities and low melting pointsOnly one correct answerA.Only (b)B.Only (b) and (c)C.Only (c) and (d)D.(a), (b) and (c)