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DAY - 01 TOPICD 1. The outer electronic configuration of group-13 elements Group 13Elements is;...

DAY - 01 TOPICD 1. The outer electronic configuration of group-13 elements Group 13Elements is; () ns² np Physical Properties (3) ns² np (2) ns² np! (4) ns² np Chemical Properties 2. What is the atomic number of thallium? Group 13 Elements (1) 81 (3) 66 (2) 77 (4) 49 Elements belonging to groups 13 to 18 of the periodic table are called p-block elements. 3. Outermost electronic configuration of agroup-13 element Main Group E is 4s² 4p'. The electronic configuration of an element of He p-block period-five placed diagonally to element, E is; Transition Metals p-block *10 (1) (Krj6d048°4p? (2) (Ar]3d'°48°4p² d-block S 16 C A. (3) [Xe Al < Ga< In Al > TI> In > Ga Density of the elements increases down the group from boron 13. Identify the correct order among the to thallium. following; (1) Size: Ga TI (4) I.E.: In > TI (1) B (2) Al (3) Ga (4) TI 14. In group 13, electronegativity first decreases from B to Aland then increases marginally down the group. This is 19. Amongst the following, which metal exist in liquid state because of; during summer ? (1) non-metallic nature of B. (1) In (2) Ga (2) discrepancies in the atomic size of the element. (3) B (4) TI (3) the ability of Band Altoform pr-pr multiple bonds. 20. A soft heavymetal with melting point 30°C and is used in (4) irregular trend in electronegativity throughout the making heat sensitive thermometers, the metal is; periodic table. (1) Caesium (2) Potassium (3) Sodium (4) Gallium 15. Statement I: Electronegativity ofB is highest among the group 13th element. Statement II: Of all the group 13th elements, the element 21. Which of the following statement is incorrect about boron? with lowest electronegativity is Thallium. (1) It is metallic in nature. (1) Both Statement-I and Statement-II are correct. (2) It is extremely hard and black coloured solid. (2) Both Statement-I and Statement-II are incorrect. (3) Statement-I is correct and Statement-II is incorrect. (3) Ithas unusually high melting point. (4) Statement-I is incorrect and Statement-II is correct. (4) It exists in many allotropic forms. 22. Boron has an exceptionally high melting point in the 16. Electronegativity of group 13 elements follow the order; group 13th elements, because; (1) B> Ga > Al> TI> In (1) boron has the smallest size in the group. (2) B> TI> Ga > Al > In (2) boron atoms are joined together by vanderwaals force. (3) B > TI > In > Ga > AI (3) boron is covalent solid. (4) B> Al > TI> In> Ga (4) boron has higher ionization energy.  23. Oxidation The considerations, increases bonding., The bonding. involved nuclear In in inert to However,enthalpies As force enthalpies Due Properties Chemical TI. (4) (3) Statement-II: (1) than (2) Statement-I: Ga, form we compounds relative pair it to Statement-I Both Both Statement-I In A* move small and to for effect) Ascharge down Statement-I Statement-I ions. of form is State heavier T1, a from very size Al Due TI* arein+l stability both result and holds considerably the only is is more B high. ofand incorrect correct acts elements: +1 thereby, of group, covalentto boron to oxidation of ns AI, and and inert as ionic and this, This Trends +1 electrons the the Statement-I Statement-II and an +3 due prevents and pair than oxidation only restricting compounds. decreases, sum sum oxidising state, oxidations Al in Statement-II :NH, trifluoride the covalent TII, BE, BBr, BI,< BE,correct called delocalised trihalides, d-orbitals to one < H,0 because BF, of like state < < > ’ ’octetcovalency boron the of BI,< BCI, BBr, BCI, acidic formed tability he "Back is in HCI + to BF, orderH,B0, F{B- aroundcasily absencetetrahedral nature bromides Trends bythe ’ overlap less behaveof are is the BCI, of except in tollOWing , BF,