The p-Block Elements

Bihar Board Class 12 · Chemistry · 73 past questions

1. Q1 2026 Set A

   The extensive use of $P_4O_{10}$ is done as

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2. Q2 2026 Set A

   Which of the following oxides is the most acidic ?

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3. Q3 2026 Set A2024 Set D

   Which of the following has the highest bond energy ?

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4. Q4 2026 Set A

   Sulphur molecule is

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5. Q5 2026 Set A

   Which of the following exhibits only one oxidation state other than zero ?

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6. Q6 2026 Set A

   Which of the following cannot act as a reducing agent ?

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7. Q7 2026 Set A

   Which of the following noble gases can most easily be liquefied ?

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8. Q8 2026 Set A

   The peroxy acid of sulphur is

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9. Q9 2026 Set A

   In which of the following processes is nitric acid manufactured from ammonia ?

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10. Q10 2026 Set A2019 Set D

    Which of the following gases cannot be collected over water ?

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11. Q11 2026 Set A

    Which of the following is formed by the reaction of Hg with ozone ?

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12. Q12 2026 Set A

    The bleaching property of chlorine is due to

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13. Q13 2026 Set A

    The outermost electronic configuration of inert gases is

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14. Q14 2026 Set A2025 Set D

    Which among the following is the strongest base ?

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15. Q15 2025 Set D

    Which of the following oxides is paramagnetic ?

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16. Q16 2025 Set D

    Ammonia can be dried by

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17. Q17 2025 Set D

    The hybridization of S in SO$_3$ is

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18. Q18 2025 Set D

    The maximum covalency of nitrogen is

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19. Q19 2025 Set D

    The number of unpaired electrons in one molecule of liquid oxygen is

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20. Q20 2025 Set D

    The most abundant noble gas in atmosphere is

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21. Q21 2024 Set D

    Which of the following elements has electronic configuration $1s^2\, 2s^2\, 2p_x^1\, 2p_y^1\, 2p_z^1$ ?

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22. Q22 2024 Set D

    Which of the following oxides of nitrogen is called laughing gas ?

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23. Q23 2024 Set D

    Which of the following is the molecular formula of Orthophosphoric acid ?

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24. Q24 2024 Set D

    The structure of $XeF_4$ is

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25. Q25 2024 Set D

    Which of the following has the smallest bond angle ?

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26. Q26 2023 Set F

    In which of the following oxidation state of oxygen is $+2$ ?

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27. Q27 2023 Set F

    Which of the following is a radioactive noble gas ?

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28. Q28 2023 Set F

    By which of the following noble gases the maximum number of compounds have been formed ?

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29. Q29 2023 Set F

    Which of the following is a polar compound ?

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30. Q30 2022 Set E

    Which of the following is the gas with lowest boiling point ?

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31. Q31 2022 Set E

    Which of the following forms only one oxyacid ?

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32. Q32 2022 Set E

    The oxidation state of S in S$_8$ is

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33. Q33 2022 Set E

    Which of the following is the least volatile ?

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34. Q34 2022 Set E

    Which of the following acts both as oxidising as well as reducing agents ?

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35. Q35 2022 Set E

    Which of the following is coloured ?

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36. Q36 2021 Set A

    Chlorine reacts with excess of ammonia to form

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37. Q37 2021 Set A

    Which of the following bonds is the strongest ?

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38. Q38 2021 Set A

    The strongest acid is

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39. Q39 2021 Set A

    Which of the following has $p\pi-d\pi$ bond?

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40. Q40 2021 Set A

    The elements of group 16 are known as

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41. Q41 2019 Set D

    PCl$_5$ is a -

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42. Q42 2019 Set D

    The formula of Nitric acid is -

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43. Q43 2019 Set D

    H$_2$SO$_4$ is a -

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44. Q44 2019 Set D

    Nitrogen & Oxygen are -

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45. Q45 2019 Set D

    White and yellow phosphorous are -

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46. Q46 2019 Set D

    The hybridisation of N in $NH_3$ is -

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47. Q47 2019 Set D

    Which of the following gas is mono-atomic?

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48. Q48 2019 Set D

    Nitric acid is prepared by -

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49. Q49 2019 Set D

    Oleum is composed of H$_2$SO$_4$ and which constituent?

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50. Q50 2019 Set D

    Ammonia changes the moist red litmus paper into -

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51. Q51 2018

    The product obtained when silica reacts with hydrogen fluoride is-

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52. Q52 2018

    Mercuric chloride reacts with ammonia gas and forms white precipitate. The molecular formula of white…

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53. Q53 2018

    Which of the following gives yellow or brown precipitate with alkaline Nessler's reagent.

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54. Q54 2018

    Most stable oxidation state of Bismuth is-

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55. Q55 2018

    Which metal nitrate gives colorless gas on thermal decomposition?

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56. Q56 2018

    Nitrogen forms only $NCl_3$ but phosphorous forms $PCl_3$ and $PCl_5$ both. Explain.

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57. Q57 2018

    Electrons affinity of Nitrogen is less than Carbon. Why?

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58. Q58 2018

    Silicon shows only +4 oxidation state but it shows both +2 and +4 oxidation states both. Why?

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59. Q59 2018

    Write the chemical reaction of $NH_3$ gas with aqueous $CuSO_4$ and $AgNO_3$ solutions respectively.

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60. Q60 2018

    HI is stronger acid than HF. Explain.

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61. Q61 2017

    Which of the following is Tribasic ?

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62. Q62 2017

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63. Q63 2016

    Which one in the following is the strongest oxidizing agent?

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64. Q64 2016

    Chemical name of borax is

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65. Q65 2016

    Good conductor of electricity and heat is

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66. Q66 2016

    In which of the following allotropes of carbon, percentage of carbon is maximum?

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67. Q67 2016

    The hybridization of carbon in diamond is

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68. Q68 2016

    Catenation property is maximum in

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69. Q69 2015

    The shape of XeF$_4$ is

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70. Q70 2015

    Which one of the following is the strongest Lewis acid?

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71. Q71 2015

    Which one of the following does not form hydrogen bonding?

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72. Q72 2015

    Which one of the following is least basic?

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73. Q73 2015

    $H_2SO_4$ is a/an

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