Tiêu đề 11. THE P-BLOCK ELEMENTS.pdf ✅

(1.) The p-block elements are found______________ in periodic table. [Page: 315] (a) left side (b) right side (c) centre (d) None of these. (2.) What is the name of p-block elements? [Page: 315] (a) Representative Elements (b) Transition (c) Inner transition (d) Any of these. (3.) What is the valence shell electronic configuration of p-block elements? [Page: 315] (a) 2 1 6 ns np − (except for He) (b) 2 6 ns np (c) 2 1 10 ns np − (d) 2 1 6 ns np − (4.) What is the common oxidation state of p-block elements? [Page: 315] (a) −2, +3 and +5 (b) −3, +3 and +5 (c) −3, +4 and +5 (d) −3, +3 and −5 (5.) Inert pair effect plays an important role in case of [Page: 315] (a) F. (b) Al. (c) Si. (d) Tl. (6.) Which of the following elements is known as halogens? [Page: 316] (a) Group 1 (b) Group 2 (c) Group 7 (d) Group 8
(7.) Match the species given in Column I with properties given in Column II. [Page: 327] ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 4 2 6 0 2 3 6 3 3 Column I Column II P Borazole i CaSO .1 / 2H O Q Plaster of Paris ii C R Boric acid iii SiO S Quartz iv B NEH T Buckminsterfullerene v H BO (a) (P)→(i), (Q)→(ii), (R)→(iii), (S)→(iv), (T)→(ii) (b) (P)→(ii), (Q)→(i), (R)→(iv), (S) →(iii), (T)→(iii) (c) (P)→(ii), (Q)→(iii), (R)→(i), (S)→(ii), (T)→(iv) (d) (P)→(iv), (Q)→(i), (R)→(v), (S)→(iii), (T)→(ii) (8.) Consider the following statements. [Page: 324] (i) The p-block is the area of the periodic table containing column 3A to column 8A (columns 13−18), not including helium. (ii) There are 35 p-block elements, all of which have valence electrons in the p-orbital. Select the correct option. (a) (i) is true, (ii) is false (b) Both (i) and (ii) are false (c) (i) is false, (ii) is true (d) Both (i) and (ii) are true (9.) Assertion: The element of 2 2 ns np configuration is of Group 14. Reason: The valency of Group 14 is four. [Pages: 316–318] (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) Both A and R are false. (10.) Assertion: Most of the compounds of p-block elements are covalent. Reason: p-block elements, in general, have high electron affinities. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) Both A and R are false. (11.) Assertion: Elements of p-block always form coloured ions in the aqueous solution. Reason: p-block elements are also called transfermium elements. [Page: 315] (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false.
(d) Both A and R are false. (12.) Assertion: The heavier p-block elements form storng p−bonds. Reasons: The heavier elements of p-block form d p  −  or d d  −  bonds. [Page: 315] (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) Both A and R are false. (13.) Which of the following is not a member of group III A?[Page: 317] (a) Ge (b) Ga (c) In (d) Tl (14.) Which of the following elements is non-metal belonging to p-block?[Page: 317] (a) Boron (b) Aluminium (c) Thallium (d) Indium (15.) The most abundant metal in the earth crust is[Page: 317] (a) Al (b) Ca (c) Fe (d) Na (16.) Bauxite has the composition (a) Al O2 3 (b) Al O , H O 2 3 2 (c) Al O · 2H O 2 3 2 (d) None of above. (17.) Which of the following minerals does not contain aluminium?[Page: 317] (a) Corundum (b) Gibbsite (c) Feldspar (d) Magnetite (18.) Boron forms covalent compounds due to[Page: 317] (a) higher ionisation enthalpy (b) lower ionisation enthalpy (c) small size (d) Both (a) and (c) (19.) Ionisation enthalpy ( 1 H kJ mol−  ) for the elements of group 13 follows the order [NCERT Exemplar, Page: 317] (a) B Al Ga In Tl     (b) B Al Ga In Tl    
(c) B Al Ga In Tl     (d) B Al Ga In Tl     (20.) Covalent radii for the group-13 elements follow which of the following order?[Page: 317] (a) Tl In Ga   (b) Ga Al B   (c) B GaAl In   (d) B Al In   (21.) Consider the following statement.[Page: 317] (i) Aluminium acts as an oxidising agent. (ii) Aluminium has a strong affinity for oxygen. Select the correct option. (a) (i) is true, (ii) is false. (b) Both (i) and (ii) are false. (c) (i) is false, (ii) is true. (d) Both (i) and (ii) are true. (22.) The liquid field metal expanding on solidification is[Page: 318] (a) Ga (b) Al (c) Zn (d) Cu (23.) Moissan boron is[Page: 318] (a) amorphous boron of ultra-purity. (b) crystalline boron of ultra-purity. (c) amorphous boron of low purity. (d) crystalline boron of low purity. (24.) The element that exists in liquid state for a wide range of temperature and can be used for measuring high temperature is[NCERT Exemplar, Page: 318] (a) B (b) Al (c) Ga (d) In (25.) Soft heavy metal melts at 30 C and is used in making heat-sensitive thermometers. The metal is [Page: 318] (a) gallium (b) sodium (c) potassium (d) caesium (26.) Which of the following metals burns in air at high temperature with the evolution of much heat?[Page: 318] (a) Cu (b) Hg (c) Pb (d) Al