p-Block Elements PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions JEE Main Chemistry · p-Block Elements · Set 1 (Q1-30)
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1. $Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite$ (1) $is an allotropic form of carbon$ (2) $is a non-crystalline substance$ (3) $has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds$ (4) $has molecules of variable molecular masses like polymers.$ 2. $Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?$ (1) $F < Cl < O < S$ (2) $S < O < Cl < F$ (3) $O < S < F < Cl$ (4) $Cl < F < S < O$ 3. $Given below are the statements about diborane (A) Diborane is prepared by the oxidation of N a B H_{4} with I_{2} (B) Each boron atom is in s p^{2} hybridized state (C) Diborane has one bridged 3 centre-2-electron bond (D) Diborane is a planar molecule The option with correct statement(s) is -$ (1) $(C) and (D) only$ (2) $(A) only$ (3) $(C) only$ (4) $(A) and (B) only$ 4. $A. Ammonium salts produce haze in atmosphere. B. Ozone gets produced when atmospheric oxygen reacts with chlorine radicals. C. Poly chlorinated biphenyls act as cleansing solvents. D. 'Blue baby' syndrome occurs due to the presence of excess of sulphate ions in water. Choose the correct answer from the options given below :-$ (1) $A, Band C only$ (2) $B and C only$ (3) $A and D only$ (4) $A and C only$ 5. $Which one of the following reactions does not come under hydrolysis type reaction?$ (1) $Li_{3} N (s) + 3 H_{2} O (l) \to NH_{3} (s) + 3 LiOH (aq)$ (2) $2 F_{2} (g) + 2 H_{2} O (l) \to 4 HF (aq) + O_{2} (g)$ (3) $P_{4} O_{10} (s) + 6 H_{2} O (l) \to 4 H_{3} PO_{4} (aq)$ (4) $SiCl_{4} (l) + 2 H_{2} O (l) \to SiO_{2} (s) + 4 HCl (aq)$ 6. $Match List - I with List - II. List - I Compound (A) Carbon tetrachloride (B) Methylene chloride (C) DDT (D) Freons List - II Use (I) Paint remover (II) Refrigerators and air conditioners (III) Fire extinguisher (IV) Non Biodegradable Insecticide Choose the correct answer from the options given below$ (1) $(A)-(I), (B), (II), (C)-(III), (D)-(IV)$ (2) $(A)-(III), (B)-(I), (C)-(IV), (D)-(II)$ (3) $(A)-(IV), (B)-(III), (C)-(II), (D)-(I)$ (4) $(A)-(II), (B)-(III), (C)-(I), (D)-(IV)$ 7. $Among the following reactions of hydrogen with halogens, the one that requires a catalyst is:$ (1) $H_{2} + I_{2} \to 2 HI$ (2) $H_{2} + Cl_{2} \to 2 HCl$ (3) $H_{2} + Br_{2} \to 2 HBr$ (4) $H_{2} + F_{2} \to 2 HF$ 8. $Which is the correct thermal stability order for H_{2} E (E=O, S, Se, Te and Po) ?$ (1) $H_{2} Se < H_{2} Te < H_{2} Po < H_{2} O < H_{2} S$ (2) $H_{2} S < H_{2} O < H_{2} Se < H_{2} Te < H_{2} Po$ (3) $H_{2} O < H_{2} S < H_{2} Se < H_{2} Te < H_{2} Po$ (4) $H_{2} Po < H_{2} Te < H_{2} Se < H_{2} S < H_{2} O$ 9. $Which of the following oxides is most acidic?$ (1) $A s_{2} O_{5}$ (2) $P_{2} O_{5}$ (3) $N_{2} O_{5}$ (4) $S b_{2} O_{5}$ 10. $Given below are two statements: Statement (I) : Oxygen being the first member of group 16 exhibits only -2 oxidation state. Statement (II) : Down the group 16 stability of +4 oxidation state decreases and +6 oxidation state increases. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Statement I is correct but Statement II is incorrect$ (2) $Both Statement I and Statement II are correct$ (3) $Both Statement I and Statement II are incorrect$ (4) $Statement I is incorrect but Statement II is correct$ 11. $Which among the following group 16 elements exists in more than two allotropic states?$ (1) $Polonium$ (2) $Tellurium$ (3) $Selenium$ (4) $Oxygen$ 12. $Given below are the oxides: N a_{2} O, A s_{2} O_{3}, N_{2} O, NO and C l_{2} O_{7} Number of amphoteric oxides is:$ (1) $0$ (2) $1$ (3) $2$ (4) $3$ 13. $Diborane (B_{2} H_{6}) reacts independently with O_{2} and H_{2} O to produce, respectively;$ (1) $B_{2} O_{3} and H_{3} BO_{3}$ (2) $B_{2} O_{3} and (BH_{4})^{-}$ (3) $H_{3} BO_{3} and B_{2} O_{3}$ (4) $HBO_{2} and H_{3} BO_{3}$ 14. $Match List-I with List-II List-I (Si-Compounds) (A) (C H_{3})_{4} Si (B) (C H_{3})Si (O H)_{3} (C) (C H_{3})_{2} Si (O H)_{2} (D) (C H_{3})_{3} Si(OH) List-II (Si-Polymeric/other products) (I) Chain silicone (II) Dimeric silicone (III) Silane (IV) 2D - Silicone Choose the correct answer from the options given below:$ (1) $(A) - (III), (B) - (II), (C) - (I), (D) - (IV)$ (2) $(A) - (IV), (B) - (I), (C) - (II), (D) - (III)$ (3) $(A) - (II), (B) - (I), (C) - (IV), (D) - (III)$ (4) $(A) - (III), (B) - (IV), (C) - (I), (D) - (II)$ 15. $Polar stratospheric clouds facilitate the formation of:$ (1) $C I O N O_{2}$ (2) $HOC1$ (3) $CIO$ (4) $C H_{4}$ 16. $Given below are two statements: Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga. Statement II : The d orbitals in Ga are completely filled. choose the most appropriate answer from the options given below$ (1) $Statement I is incorrect but statement II is correct.$ (2) $Both the statements I and II are correct$ (3) $Statement I is correct but statement II is incorrect$ (4) $Both the statements I and II are incorrect$ 17. $Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?$ (1) $Pyrophosphorous acid$ (2) $Hypophosphoric acid$ (3) $Phosphoric acid$ (4) $Pyrophosphoric acid$ 18. $The correct statement about B_{2} H_{6} is:$ (1) $All B-H-B angles are of 120°.$ (2) $Its fragment, BH_{3}, behaves as a Lewis base.$ (3) $Terminal B-H bonds have less p-character when compared to bridging bonds.$ (4) $The two B-H-B bonds are not of same length.$ 19. $Chlorine on reaction with hot and concentrated sodium hydroxide gives :$ (1) $Cl^{-} and ClO_{3}^{-}$ (2) $Cl and ClO^{-}$ (3) $ClO_{3}^{-} and ClO_{2}^{-}$ (4) $Cl^{-} and ClO_{2}^{-}$ 20. $The structure of PC l_{5} in the solid state is:$ (1) $tetrahedralPCl4+and octahedral (PC l_{6})^{-}$ (2) $square pyramidal$ (3) $trigonalbipyramidal$ (4) $square planar (PC l_{4})^{+} and octahedral (PC l_{6})^{-}$ 21. $The correct decreasing order of basicity of hydrides of Group-15 elements is$ (1) $SbH_{3} > AsH_{3} > PH_{3} > NH_{3}$ (2) $PH_{3} > AsH_{3} > SbH_{3} > NH_{3}$ (3) $AsH_{3} > SbH_{3} > NH_{3} > PH_{3}$ (4) $NH_{3} > PH_{3} > AsH_{3} > SbH_{3}$ 22. $Which of the following is not oxidised by O_{3} ?$ (1) $KΙ$ (2) $K M n O_{4}$ (3) $K_{2} M n O_{4}$ (4) $F e S O_{4}$ 23. $Match the List-I with List- II. List-I (Metal) (A) Cs (B)Ga (C)B (D)Si List-II Application (I) High temperature thermometer (II) Water repellent sprays (III) Photoelectric cells (IV) Bullet proof vest Choose the most appropriate answer from the option given below:$ (1) $(A)-(III), (B)-(I), (C)-(IV), (D)-(II)$ (2) $(A)-(IV), (B)-(III), (C)-(II), (D)-(I)$ (3) $(A)-(II), (B)-(III), (C)-(IV), (D)-(I)$ (4) $(A)-(I), (B)-(IV), (C)-(II), (D)-(III)$ 24. $Given below are two statements: Statement I: The increasing order of boiling point of hydrogen halides is HCl < HBr < HI < HF . Statement II: The increasing order of melting point of hydrogen halides is HCl < HBr < HF < HI . In the light of the above statements, choose the correct answer from the options given below :$ (1) $Statement I is true but Statement II is false$ (2) $Both Statement I and Statement II are true$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is false but Statement II is true$ 25. $The number of neutrons present in the more abundant isotope of boron is ' x'. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is ' y'. The value of x + y is _______$ (1) $3$ (2) $9$ (3) $4$ (4) $6$ 26. $Which of the following electrolyte can be used to obtain H_{2} S_{2} O_{8} by the process of electrolysis?$ (1) $Dilute solution of sodium sulphate.$ (2) $Acidified dilute solution of sodium sulphate.$ (3) $Dilute solution of sulphuric acid$ (4) $Concentrated solution of sulphuric acid$ 27. $Choose the correct stability order of group 13 elements in their +1 oxidation state.$ (1) $Al< Ga < In < Tl$ (2) $Tl< In < Ga < Al$ (3) $Al< Ga < Tl< In$ (4) $Al< Tl< Ga < In$ 28. $What is the highest oxidation state exhibited by group 17 elements?$ (1) $+1$ (2) $+3$ (3) $+5$ (4) $+7$ 29. $The element that shows greater ability to form pπ - pπ multiple bonds, is :$ (1) $Sn$ (2) $C$ (3) $Ge$ (4) $Si$ 30. $In which of the following arrangements the given sequence is not strictly according to the property indicated against it ?$ (1) $HF < HCl < HBr < HΙ : increasing acidic strength$ (2) $H2O < H2S < H2Se < H2Te : increasing pKa values$ (3) $NH3 < PH3 < AsH3 < SbH3 : increasing acidic character$ (4) $CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power$