Tiêu đề 03. CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES.pdf ✅

(3) Na Mg Be Si P     (4) P     Be Si Mg Na (9.) Which of the following elements is considered as a non metal : (1) Sc (2) Pb (3) Bi (4) Se (10.) Correct electronic configuration of all f-block element : (1) ( ) 1 14 0 1 2 n f nd ns 1 − − − (2) ( ) ( ) 1 14 0 1 2 n f n d ns 2 1 − − − − (3) ( ) 1 14 2 1 5 n f ns np 2 − − − (4) ( ) ( ) 1 14 1 10 2 n f n d ns 2 1 − − − − (11.) The correct order of electron gain enthalpy is : (1) Te Se S O    (2) S Se Te O    (3) O S Se Te    (4) S O Se Te    (12.) Given below are two statements : Statement I: Metallic character decreases and non metallic character increases on moving from left to right in a period. Statement II : Electronegativity generally increase across a period from left to right and decrease down a group in a periodic table. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both Statement I and Statement II are incorrect (2) Statement I is correct but Statement II is incorrect (3) Statement I is incorrect but Statement II is correct (4) Both Statement I and Statement II are correct. (13.) The first ionization enthalpies of Be,B, N and O follow the order : (1) O N B Be    (2) Be B O N    (3) B Be N O    (4) B  B e  O  N (14.) Given below are two statements : Statement I: The ionization enthalpy is expressed in unit of 1 KJmol− and always positive. Statement II : When an electron is added to a neutral gaseous atom ( X ) to convert into a negative ion, the enthalpy change accompanying the process is defined as the electron gain enthalpy. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both Statement I and Statement II are incorrect (2) Statement I is correct but Statement II is incorrect (3) Statement I is incorrect but Statement II is correct
(4) Both Statement I and Statement II are correct. (15.) The IUPAC nomenclature of an element with electronic configuration [Rn] 14 1 2 5 6 7 f d s is : (1) Unnilbium (2) Unnilunium (3) Unnilquadium (4) Unniltrium (16.) On going right to left in a period ionisation energy generally : (1) Increases (2) Decreases (3) st 1 increases then decreases (4) None of these (17.) For which of the following pair Newland octave rule is not applicable : (1) Li, Na (2) C,Si (3) Mg,Ca (4) Cl, Br (18.) Which of the following element was present in Mendeleev's periodic table : (1) Ga (2) Ge (3) Both (4) None of these (19.) Which of the following set of atomic number represents representative element : (1) 5,13,30,53 (2) 11,33,58,84 (3) 5,17,31,58 (4) 9,31,53,87 (20.) The electronic configuration of an element is 2 1s , 2 6 2 6 10 2 2 ,2 ,3 ,3 ,3 ,4 s p s p d s . What is the atomic number of next element of the same group : (1) 38 (2) 48 (3) 58 (4) 82 (21.) Given below are two statements : Statement I: A plot of v against atomic weight gave a straight line. Statement II : The sixth period (n = 6) contains 32 elements and successive electrons enter 6 , 4 ,5 s f d and 6 p orbitals, in the order filling up of the 4 f orbitals begins with cerium (Z = 58) and ends with lutetium (Z 71 = ) to give the 4f inner transition series. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both Statement I and Statement II are incorrect (2) Statement I is correct but Statement II is incorrect (3) Statement I is incorrect but Statement II is correct (4) Both Statement I and Statement II are correct. (22.) The characteristics of elements X Y, and Z with atomic numbers respectively 33,53 and 83 are : (1) X is metalloid, Y is a non-metal and Z is a metal (2) X is metals, Y is a non-metal and Z is a metalloids