Tiêu đề 011) P-Block DPP 01(Extra DPP) Varun JEE Advanced 2024.pdf ✅

1 ADVANCED BATCH P-Block Single Correct Question 1. Which is not the property of diamond? (1) It is insoluble in all solvents (2) It is oxidised with a mixture of K2Cr2O7 and H2SO4 at 200°C (3) Being hardest, it is used as an abrasive for sharpening hard tools. (4) Δf H– value of diamond is 1.90 kJ mol –1 . 2. The decrease in stability oi higher oxidation state in p-block with increasing atomic number is due to: (1) Increase In bond energy as going down the group. (2) the reluctance of s-sub shell electrons to participate in the chemical bonding. (3) both are correct. (4) Noble gas configuration achieved by lower oxidat ion state. 3. Carbon and silicon belong to (IV) group. The maximum coordination number of carbon in commonly occurring compounds is 4. whereas that of silicon is 6. This is due to: (1) Large size oi silicon (2) More electropositive nature of silicon (3) Availability of low lying d-orbitals in silicon (4) Both (1) and (2) 4. In diborane the two H–B–H angles are nearly: (1) 60°, 120° (2) 97°, 120° (3) 95°, 150° (4) 120°, 180° 5. Select the correct option regarding the bond strength of C14O16, C12O16, C14O18 (1) C 14O18 > C 14O16 > C 12O16 (2) C 14O18 < C 14O16 < C 12O16 (3) C 14O18 > C 14O16 < C 12O16 (4) C 14O18 < C 14O16 > C 12O16 6. When borax is dissolved in water: (1) B(OH)3 is formed only (2) [B(OH)4] – is formed only (3) Both B(OH)3 and [B(OH4)] – are formed (4) [B3O3(OH)4] – is formed only 7. Sum of the lone pair of electron on central atom of following species is: BF3, CF4, SiF4 8. How many of the following statements are correct regarding allotropes of carbon: (A) Graphite is not a good conductor of electricity in perpendicular direction of layers at ordinary temperatures. (B) Coke is the impure form of carbon. (C) Anthracite is the purest form of Carbon. (D) Buckminister fullerene contains 12 five membered rings and 20 six-membered rings. (E) Diamond is a good conductor of Heat. (F) Graphite is diamagnetic in nature. (G) Graphite is thermodynamically more stable than diamond 9. The number of oxygen atoms in borax which do not form pπ- pπ back bond is: 10. Which of the following salts are amphoteric in nature. (A) PbO (B) PbO (C) SnO (D) SnO2 (E) Al2O3 (F) ZnO (G) BeO (H) Ga2O3 (I) B2O3 More than One Correct 11. Select the correct statement(s). (1) The graphite is diamagnetic and diamond is paramagnetic in nature. (2) Graphite acts as a metallic conductor along the layers of carbon atoms (3) Graphite is less denser than diamond (4) C60 is called as Buckminster fullerene 12. One of the most fascinating developments in Modern chemistry has been the synthesis oi Buckminister fullerene, C60. Identify the correct options about C60. (1) It consists of fused 5 and 6 membered carbon rings. (2) All atoms are not-equivalent. (3) All bonds are not-equivalent (4) C-C bond lengths at the fusion of two 6-membered rings are shorter with the C–C bond length at the fusion of 5 and 6-membered rings. DPP - 01
2 13. Which statement(s) is/are correct? (1) Al acts as a reducing agent (2) Al does not significantly react with steam even at high temperatures. (3) Al forms a number of alloys with other metals (4) Al is ionic in all its compounds 14. Carbon monoxide is prepared by: (1) heating formic acid with cone. H2SO4 (2) heating potassium ferrocyanide with cone H2SO4 (3) heating malonic acid with P4O10 (4) hydrolysis of Mg2C3 15. Select the correct statement (s) (1) CH3 SiCl3 undergoes hydrolysis followed by inter molecular elimination of water to form a complex cross - linked polymer (i.e. silicone) (2) Silicone fluids are thermally stable. (3) In sheet silicate. three oxygen atoms of each tetrahedral are snared with adjacent SiO4 4– tetrahedrals. (4) Silica is attacked by HF and NaOH. 16. Choose the correct option regarding bond enthalpy of following: Column-A Column-B [bond] [bond enthalpy (KJ/mol)] (a) C–C (p) 240 (b) Si–Si (q) 260 (c) Ge–Ge (r) 297 (d) Sn–Sn (s) 348 (1) (a - p); (b - q); (C - r); (d - s) (2) (a - s); (b - r); (c - q); (d - p) (3) (a - p); (b - r); (c - q); (d - s) (4) (a - r); (b - s); (c - q); (d - p) 17. Match the reactions listed in column-I with characteristic(s) / type of reactions listed in column-II. Column-I Column-II (1) BBr3 + H2 → B (p) Borax bead test (2) Na2B4O7.10H2O + CuSO4 → Cu(BO2)2 (q) Reduction (3) AlCl3 + H2O → HCl (r) White fumes (4) Cr2O3 + Al → Cr (s) Hydrolysis Comprehension 01 All the boron trihalides except BI3 may be prepared by direct reaction between the elements. Boron trihalides consist of trigonal - planar BX3 molecules. Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and solid states, BF3 and BCl3 are gases, BBr3 is a volatile liquid and BI3 is a solid. Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction: BF3(g) + :NH3(g) → F3B–NH3(S) However, boron chlorides, bromides and iodides are susceptible (sensitive) to protolysis by mild proton sources such as water, alcohols and even amines; for example BCl3 undergoes rapid hydrolysis: BCl3(g) + 3H2O(l) → B(OH)3(aq) + 3HCl(aq) It is supposed that the first step in the above reaction is the formation of the complex Cl3B ← OH2 which then eliminates HCI and reacts further with water. 18. Which of the following is the best order of Lewis acid strength of BF3, BCl3 and BBr3? (1) BF3 > BC3 > BBr3 (2) BF3 = BCl3 = BBr3 (3) BF3 < BCl3 < BBr3 (4) BBr3 > BF3 > BCl3 19. Which of the following is the correct prediction about observed B-X bond length, in BX3 molecules? (1) B–F bond length in BF3 is found to be less than theoretical value because the electronegativity values of B(2.04) and F(4.0) suggest the bond to be ionic and hence the attraction between oppositely charged ions must decrease the bond length (2) BF3 and [BF4] – have equal B–F bond length (3) The decrease in the B–F bond length in BF3 is due to delocalised pπ-pπ bonding between vacant '2p' orbital of Band filled '2p' orbital of F (4) The correct B–X bond length order is B–F > B–CI > B–Br > B–I 20. Which is correct about the hydrolysis of BX3? (1) All BX3 undergo hydrolysis to produce B(OH)3 (aq) and HX(aq). (2) BF3 does not undergo complete hydrolysis due to formation of HBF4. (3) BBr3 does not undergo hydrolysis at all because it cannot form H-bonds with water. (4) All the above are correct
3 Answer Key 1. (2) 2. (2) 3. (3) 4. (2) 5. (1) 6. (3) 7. ( 0 ) 8. ( 6 ) 9. ( 3 ) 10. ( 8 ) 11 . ( 2, 3, 4 ) 12 . ( 1, 3, 4 ) 13 . ( 1, 2, 3 ) 14 . ( 1, 3 ) 15. ( 1, 2, 3, 4 ) 16. (2) 17. (A - q); (B - p); (C - r, s); (D - q) 18. (3) 19. (3) 20. (2)