Title 11.P- BLOCK(13, 14).pdf ✅

7. Which of the following does not form M3+ ion? (a) Boron (b) Aluminium (c) Indium (d) Gallium 8. Thallium shows different oxidation states because (a) it is transition element NCERT/ Page-318 (b) of inert pair effect (c) of its amphoteric character (d) of its higher reactivity 9. The metal that has very low melting point and its periodic position is closer to a metalloid is : (a) Al NCERT/ Page-318 (b) Ga (c) Se (d) In 10. Aluminium vessels should not be washed with materials containing washing soda becauseNCERT/ Page-319 (a) washing soda is expensive (b) washing soda is easily decomposed (c) washing soda reacts with aluminium to form soluble aluminate (d) washing soda reacts with aluminium to form insoluble aluminium oxide 11. Amphoteric oxide among the following is NCERT Page-319 (a) B2O3 (c) In2O3 (b) Ga2O3 (d) Tl2O3 12. The electronegativity of aluminium is similar to: NCERT/ Page-318 (a) Carbon (b) Beryllium (c) Boron (d) Lithium 13. Choose the correct stability order of group 13 elements in their +1 oxidation state. NCERT/ Page-318 (a) Al < Ga < In < Tl (b) Tl < In < Ga < Al (c) Al < Ga < Tl < In (d) Al < Tl < Ga < In 14. Which metal is protected by a layer of its own oxide? NCERT/ Page-319 (a) Al (b) Ag (c) Au (d) Fe 15. Which of the following does not react with aqueous NaOH ? NCERT Page-319 (a) B (b) Al
(c) Ga (d) Tl 16. Which of the following hydroxide is acidic? (a) Al(OH)3 (b) Ca(OH)3 (c) Tl(OH)3 (d) B(OH)3 17. Which among the following oxides react with alkali? B2O3, Al2O3 and Tl2O (a) B2O3 and Al2O3 (c) Only B2O3 (b) Al2O3 and Tl2O (d) B2O3 and Tl2O 18. What is x in the following reaction? NCERT/ Page-319 Al(s) + NaOH(aq) + H2O(l) → x + H2(g) (a) Na2 [Al(OH)4 ] − (b) Na+[Al(OH)4 ] − (c) Na2 [Al(OH)6 ] (d) Na+[Al(OH)6 ] 8.2 IMPORTANT TRENDS AND ANOMALOUS PROPERTIES OF BORON 19. The strongest Lewis acid is NCERT/ Page-320 (a) BF3 (c) BBr3 (b) BCl3 (d) BI3 20. NH3 and BF3 form an adduct readily because they form NCERT/ Page-320 (a) a coordinate bond (b) a hydrogen bond (c) an ionic bond (d) a covalent bond 21. The factor responsible for weak acidic nature of B − F bonds in BF3 is NCERT Page-320 (a) large electronegativity of fluorine (b) three centred two electron bonds in BF3 (c) pπ − dπ back bonding (d) pπ − pπ back bonding 22. What is the oxidation state and hybridisation of boron in compound formed when BCl3 undergoes reaction with the water? (a) 3, sp 2d (b) 3, sp 3 (c) 4, sp 3 (d) 3, sp 2d