12th Class Chemistry The p-block Elements-II / p-ब्लॉक तत्व-II Question Bank

done Case Based (MCQs) - The p Block Elements Total Questions - 25

• question_answer1)

  Direction (1 - 5): Neil Bartlett was the first to produce non-transient amounts of a compound of a noble gas. In June 1962, N.Bartlett, announced the discovery of a 1:1 compound between xenon and hexafluoroplatinate,\[XePt{{F}_{6}}\], a mustard yellow solid, whose formula is \[X{{e}^{+}}{{[Pt{{F}_{6}}]}^{-}}\] Bartlett told that nobody else suggested to him to try this particular reaction ; it was his own idea. He did not start thinking about this until he had identified \[{{O}_{2}}\]\[Pt{{F}_{6}}\].

  (Reference:I. Hargittai. Neil Bartlett and the first noble gas compound Struct chem (2009) 20 :953 - 959)

  Which noble gas forms maximum of the noble gas compounds?
  A)
  Helium                          done clear
  B)
  Argon done clear
  C)
  Krypton                         done clear
  D)
  Xenon. done clear
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• question_answer2)
  What was the yellow solid obtained by them?
  A)
  \[{{\left[ Xe{{F}_{2}} \right]}^{+}}{{\left[ Pt{{F}_{6}} \right]}^{-}}\]  done clear
  B)
  \[{{\left[ XeF \right]}^{+}}{{\left[ Pt{{F}_{6}} \right]}^{-}}\] done clear
  C)
  \[X{{e}^{+}}{{\left[ Pt{{F}_{6}} \right]}^{-}}\]     done clear
  D)
  \[\left[ Pt{{F}_{4}} \right]{{\left[ Xe{{F}_{7}} \right]}^{-}}\] done clear
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• question_answer3)
  In what molar ratio must Xe and \[{{F}_{2}}\] combine to give \[Xe{{F}_{4}}\] ?
  A)
  2:1                                done clear
  B)
  1:2 done clear
  C)
  1:5                    done clear
  D)
  1:20. done clear
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• question_answer4)
  The hybridisation state of Xe in \[XeO{{F}_{4}}\] is :
  A)
  \[s{{p}^{3}}\]                                      done clear
  B)
  \[s{{p}^{3}}d\] done clear
  C)
  \[ds{{p}^{2}}\]                                    done clear
  D)
  \[s{{p}^{3}}{{d}^{2}}\] done clear
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• question_answer5)
  What prompted Bartlett to prepare first noble gas compound?
  A)
  High bond energy of Xe - F Bond done clear
  B)
  Low bond energy of F - F in \[{{F}_{2}}\] molecule done clear
  C)
  Oxygen and xenon have almost similar ionization potentials. done clear
  D)
  None of these. done clear
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• question_answer6)

  Direction (6-10): Read the passage given below and answer the following questions:

  Inspite of chlorine importance in the water disinfection and decrease the pathogens in the water, chlorine gas is fatal even if it is at concentrations as low and has important role in the occurrence of several diseases through its participant in the deficiency of immunity, cancer and Abnormalities. The presence of alternatives become important to decrease the effects that has become so widespread. As some countries still use this substance in water sterilization, it is necessary to look for less hazardous and less harmful substances. (Souce : Harjan, Israa and Mohsen, Athraa and Zaidan, Holder. (2019). HEALTH EFFECTS OF CHLORINATED WATER : A REVEIW ARTICLE. Pakistan Journal of Biotechnology. 16. 163-167. 10.34016/pjbt. 2019. 16.3.24)   (Sample Paper 2020)

  In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

  Assertion: Chlorine is used in water disinfection.

  Reason: Chlorine gas is harmful even at its low concentration.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer7)

  Assertion: Chlorine is used in water sterilization.

  Reason: Chlorine kills pathogens in the water.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer8)

  Assertion: Chlorine is also used as bleaching agent in pulp of wood pulp used in the manufacture of paper.

  Reason: Chlorine is very less soluble in water and produces nascent oxygen due to which it has bleaching action.

  \[C{{l}_{2}}+{{H}_{2}}O\to 2HCl+O\]

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer9)

  Assertion: Chlorine water on standing loses its colour.

  Reason: Chlorine water on standing forms HCI and HOCI.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer10)

  Assertion: Chlorine gas is about 2-5 times heavier than air.

  Reason: Chlorine can be liquified easily into greenish yellow liquid.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer11)

  Direction (11 - 13): The hydrides of oxygen family are : \[{{H}_{2}}O\], \[{{H}_{2}}S\], \[{{H}_{2}}Se\], \[{{H}_{2}}Te\] and \[{{H}_{2}}Po\]. The acidic nature, thermal stability and reducing character of these hydrides depend on the strength of M-H bond. Smaller the size of central atom (M), greater is the strength of M-H bond. These hydrides are angular, involves \[s{{p}^{3}}\] hybridisation and their comparative bond angle depends upon the repulsions between the bond pairs.

  Which of the following hydrides is the most acidic?
  A)
  \[{{H}_{2}}Te\]                        done clear
  B)
  \[{{H}_{2}}Se\] done clear
  C)
  \[{{H}_{2}}O\]                         done clear
  D)
  \[{{H}_{2}}S\] done clear
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• question_answer12)
  The boiling points of hydrides of group 16 are in the order
  A)
  \[{{H}_{2}}O>{{H}_{2}}Te>{{H}_{2}}S>{{H}_{2}}Se\] done clear
  B)
  \[{{H}_{2}}O>{{H}_{2}}S>{{H}_{2}}Se>{{H}_{2}}Te\] done clear
  C)
  \[{{H}_{2}}O>{{H}_{2}}Te>{{H}_{2}}Se>{{H}_{2}}S\] done clear
  D)
  None of these. done clear
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• question_answer13)
  Bond angle in \[{{H}_{2}}S\] and \[{{H}_{2}}Te\] are respectively :
  A)
  \[92{}^\circ \], \[94{}^\circ \]                done clear
  B)
  \[104.5{}^\circ \], \[92{}^\circ \] done clear
  C)
  \[90{}^\circ \], \[92{}^\circ \]                done clear
  D)
  \[92{}^\circ \], \[90{}^\circ \] done clear
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• question_answer14)

  Direction (14-17): The hydrides of chlorine, bromine and iodine can be made by direct reaction with hydrogen under suitable conditions. They are all strongly fuming gases and in water they form strongly acidic solutions. Reducing character, thermal stability and acidic nature of hydrides depends on the strength of H—X bond. HF has some unusual properties.

  Hydrogen halide which cannot act as reducing agent is
  A)
  HI                                 done clear
  B)
  HBr done clear
  C)
  HP                                done clear
  D)
  HCI. done clear
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• question_answer15)
  HF is a weaker acid than HI, because
  A)
  H-F bond is stronger than HI bond done clear
  B)
  fluorine is more electronegative than iodine done clear
  C)
  of the presence of hydrogen bonds in HF done clear
  D)
  fluorine is a stronger base as compared to iodine. done clear
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• question_answer16)
  The correct order of the thermal stability of hydrogen halides (H-—X) is
  A)
  HI > HBr > HCI > HF done clear
  B)
  HF > HCI > HBr > HI done clear
  C)
  HCI > HF > HBr > HI done clear
  D)
  HI > HCI > HF > HBr. done clear
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• question_answer17)
  Which of the following halides forms salt like \[KH{{X}_{2}}\]( where X is a halogen atom) ?
  A)
  HF        done clear
  B)
  HCI done clear
  C)
  HBr                              done clear
  D)
  HI done clear
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• question_answer18)

  Direction (18-21): Halogens form a number of oxides with different oxidation states of halogens. Fluorine forms only two oxides \[O{{F}_{2}}\] and \[{{O}_{2}}{{F}_{2}}\]. Oxides are generally covalent, decompose on heating and act as strong oxidising agents. Their acidic strength and stability is determined by the oxidation state of the halogen.

  Which of the following is paramagnetic?
  A)
  \[C{{l}_{2}}O\]                         done clear
  B)
  \[Cl{{O}_{2}}\] done clear
  C)
  \[C{{l}_{2}}{{O}_{7}}\]                       done clear
  D)
  \[C{{l}_{2}}{{O}_{6}}\] done clear
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• question_answer19)
  Most acidic oxide among following is
  A)
  \[C{{l}_{2}}{{O}_{5}}\]                       done clear
  B)
  \[C{{l}_{2}}O\] done clear
  C)
  \[C{{l}_{2}}{{O}_{3}}\]                       done clear
  D)
  \[C{{l}_{2}}{{O}_{7}}\] done clear
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• question_answer20)
  \[C{{l}_{2}}O\] is anhydride of
  A)
  HOCI      done clear
  B)
  \[HCI{{O}_{2}}\] done clear
  C)
  \[HCI{{O}_{3}}\] and \[HCI{{O}_{4}}\] done clear
  D)
  \[HCI{{O}_{2}}\] and \[HCI{{O}_{3}}\]. done clear
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• question_answer21)
  The bond angle in \[C{{l}_{2}}O\] is greater as compared to that of \[O{{F}_{2}}\] because
  A)
  of greater repulsions between the larger chlorine atoms. done clear
  B)
  in case of \[C{{l}_{2}}O\], there are more bondpair- bond pair repulsions than in case \[O{{F}_{2}}\] done clear
  C)
  in case of \[C{{l}_{2}}O\], electrons are nearer to oxygen while in case of \[O{{F}_{2}}\] electrons are nearer to fluorine done clear
  D)
  all the above done clear
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• question_answer22)

  Direction (22 - 25): Sulphur has a number of oxyacids which are known either in free state or in the form of salts or both. Acids ending in -ous have S in the oxidation state '+4' and form salts ending in -ite. Acids ending in -ic have S in the oxidation state '+6' and form salt ending in -ate. In peroxyacids, there is a peroxy linkage hence oxidation number of sulphur is '+6'. Oxyacids with S-S links are called thioacids.

  A salt of \[{{H}_{2}}S{{O}_{3}}\] acid is called
  A)
  Sulphate            done clear
  B)
  Sulphurate done clear
  C)
  Sulphite         done clear
  D)
  Sulphide. done clear
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• question_answer23)
  Peroxy linkage is present in
  A)
  \[{{H}_{2}}S{{O}_{5}}\]        done clear
  B)
  \[{{H}_{2}}S{{O}_{3}}\] done clear
  C)
  \[{{H}_{2}}S{{O}_{4}}\]                     done clear
  D)
  \[{{H}_{2}}{{S}_{2}}{{O}_{7}}\] done clear
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• question_answer24)
  Oxidation number of S in Marshall's acid and dithionic acid are respectively.
  A)
  + 6, + 6           done clear
  B)
  + 6, + 5 done clear
  C)
  + 4, + 6           done clear
  D)
  + 5, + 6. done clear
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• question_answer25)

  In which of the following S-S linkage is present?

  I. Marshall's acid, II. Dithionic acid. III. Thiosulphuric acid, IV. Caro's acid

  A)
  I and II        done clear
  B)
  II and IV done clear
  C)
  II and III       done clear
  D)
  I and III done clear
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