l Sprint 6:56 PM * 53% 1311 Practice test -4.docx 30) Determine the element that

Question

l Sprint 6:56 PM * 53% 1311 Practice test -4.docx 30) Determine the element that is not correctly described A) Sc is a d-block element that has one 3d electron B) Ar is a third-period noble diatomic gas C) O is a p-block element with four 2p electrons D) Na is a s-block element that has a low first ionization energy E) All of the above statements are incorrect 31) Which of the following is true regarding van der Waals radius and covalent radius of an atom? A) van der Waals and covalent radii for an atom is identical B) van der Waals radius>covalent radius C) van der Waals radius Si Si>Na D) CISi Na E) None of above 34) The first ionization of P and S are1063 kJ/mol and 1000 kJ/mol respectively. This is due to A) P lies to the left of S B) P has a half-filled 3p-shell C) There are no unpaired electrons in S D) P has odd number of electrons E) None of above Open with Print

Explanation / Answer

Solution :-

#30) The incorrectly described element is the Argon (Ar) because it is not diatomic gas therefore correct answer is option B.

#31) Answer is option C because the Van der waals radius is the less than covalent radius becaue it half of the distance between the closest approach between the two non bonded atoms of the element.

#32) The answer is option B that is increased number of electrons.

#33) The ionization energy of the elements increases from left to right in the period therefore the correct answer is option C that is Cl > Si > Na

#34) The first ionization of the P is higher than S because the P has half filled 3p orbital which is more stable therefore it have higher first ionization than S

Hence the correct answer is option B

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