JEE Main & Advanced Chemistry The p-block Elements-II / p-ब्लॉक तत्व-II Question Bank

done Mock Test - The p-Block Elements (Groups 13, 14) Total Questions - 25

• question_answer1)
  Aluminum vessels should not be washed with materials containing washing soda since
  A)
  Washing soda is expensive done clear
  B)
   Washing soda is easily decomposed done clear
  C)
   Washing soda reacts with Al to form insoluble aluminum oxide. done clear
  D)
   Washing soda reacts with Al to form soluble aluminate done clear
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• question_answer2)
  Among the halides

  (I) \[BC{{l}_{3}}\]

  (II) \[AlC{{l}_{3}}\]

  (III) \[GaC{{l}_{3}}\]

  (IV) \[InC{{l}_{3}}\]

  The order of decreasing Lewis acid character is:
  A)
  I, II, III, IV         done clear
  B)
  II, III, IV, I done clear
  C)
  III, IV, II, I        done clear
  D)
  IV, III, II, I done clear
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• question_answer3)
  \[BC{{l}_{3}}\]does not exist as dimer but \[B{{H}_{3}}\]exist as dimer (\[{{B}_{2}}{{H}_{6}}\]) because
  A)
  Chlorine is more electronegative than hydrogen done clear
  B)
   There is \[p\pi \]-\[p\pi \]back bonding in \[BC{{l}_{3}}\] but \[B{{H}_{3}}\]does not contain such multiple bonding done clear
  C)
   Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms done clear
  D)
   None of the above done clear
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• question_answer4)
  A mixture of boric acid with ethy1 alcohol burns with green edged flame due to the formation of
  A)
  Ethy 1 borax      done clear
  B)
  Ethy1 borate done clear
  C)
  Methy1 Borax done clear
  D)
  Methy1 borate done clear
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• question_answer5)
  How the reaction below can be made to proceed in forward direction? \[B{{(OH)}_{3}}+NaOH\to [NaB{{(OH)}_{4}}]\,or\,[NaB{{O}_{2}}+{{H}_{2}}O]\]
  A)
  Addition of borax done clear
  B)
   Addition of cis-1, 2-diol done clear
  C)
   Addition of trans-1, 2-diol done clear
  D)
   Addition of \[N{{a}_{2}}HP{{O}_{4}}\] done clear
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• question_answer6)
  Correct order of stability of hydrides of carbon family is
  A)
   \[C{{H}_{4}}>Si{{H}_{4}}>Ge{{H}_{4}}>Sn{{H}_{4}}>Pb{{H}_{4}}\] done clear
  B)
   \[C{{H}_{4}}<Si{{H}_{4}},<Ge{{H}_{4}}<Sn{{H}_{4}}<Pb{{H}_{4}}\] done clear
  C)
   \[C{{H}_{4}}.>Sn{{H}_{4}},>Ge{{H}_{4}}>Sn{{H}_{4}}>Pb{{H}_{4}}\] done clear
  D)
   None of the above done clear
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• question_answer7)
  An oxide of carbon (X) reacts with ammonia to produce urea an important fertilizer. Which of the following combinations will not Yield (X).
  A)
   \[C{{O}^{2-}}_{3}+HCl\xrightarrow{\Delta }\] done clear
  B)
   \[CaO+C\xrightarrow{\Delta }\] done clear
  C)
   \[C+Excess{{O}_{2}}\xrightarrow{\Delta }\] done clear
  D)
   \[HC{{O}^{-}}_{3}+HCl\xrightarrow{\Delta }\] done clear
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• question_answer8)
  Select the incorrect statement.
  A)
  Silicones are hydrophobic in nature. done clear
  B)
   Si-O-Si linkages are moisture sensitive. done clear
  C)
   \[Sn{{I}_{4}}\]is an orange solid on account of charge transfer. done clear
  D)
   Silicones are resistant to most chemicals due to high strength of the Si-C bond and stable silica like structure of Si-O-Si-O-Si. done clear
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• question_answer9)
  A gas does not turn lime water milky, supports the combustion of burning magnesium. It has no smell and is colourless. It extinguishes a glowing splint but under some circumstances reacts with oxygen and hydrogen. It is not poisonous. The gas is likely to be:
  A)
  Nitrogen             done clear
  B)
  Water vapour done clear
  C)
  Carbon disoxide done clear
  D)
  Helium done clear
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• question_answer10)
  Aluminum is more reactive than iron because its standard reduction potential is higher, still aluminum is less easily corroded than iron because:
  A)
  It has higher reducing power and forms self-protective layer of \[A{{l}_{2}}{{O}_{3}}\] done clear
  B)
   It has higher reducing power and does not react with oxygen so easily done clear
  C)
   Al reacts with atmospheric carbon dioxide to form a self-protective layer of \[A{{l}_{2}}{{O}_{3}}+A{{l}_{4}}{{C}_{3}}\] done clear
  D)
   all of the above done clear
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• question_answer11)
  A certain salt (X) gives the following tests:

  (i) Its aqueous solution is alkaline to litmus.

  (ii) On strongly heating it swells to give a glassy bead

  (iii) When concentrated sulphuric acid is added to hot concentrated solution of (x), crystals of \[{{H}_{3}}B{{O}_{3}}\]separate out. Identify the colour of these crystals.

  A)
  Violet    done clear
  B)
  Blue done clear
  C)
  Brown              done clear
  D)
  White done clear
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• question_answer12)
  Which of the following statements is correct?
  A)
  \[BC{{l}_{3}}\] and \[AlC{{I}_{3}}\]are both Lewis acids and \[BC{{l}_{3}}\]is stronger than \[AlC{{l}_{3}}\] done clear
  B)
   \[BC{{l}_{3}}\]and \[AlC{{l}_{3}}\]both Lew is acids and \[AlC{{l}_{3}}\]is stronger that \[BC{{l}_{3}}\] done clear
  C)
   \[BC{{l}_{3}}\] and \[AlC{{I}_{3}}\]are both equally strong Lewis acids done clear
  D)
   Both \[BC{{l}_{3}}\]and \[AlC{{l}_{3}}\] are not Lewis acids. done clear
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• question_answer13)
  Precipitation of \[A{{l}^{3+}}\](aq) \[Al{{(OH)}_{3}}\]by \[C{{O}_{2}}\] shows that
  A)
  The acidic property is very weak done clear
  B)
   The acidic property is very strong done clear
  C)
   The basic property is very strong done clear
  D)
   The basic property is very weak done clear
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• question_answer14)
  Boron of highest purity (~99.9%)is obtained by
  A)
  Reduction of \[{{B}_{2}}{{O}_{3}}\]by mg. done clear
  B)
   Electrolysis of fused tetrafluoroborates (\[KB{{F}_{4}}\]) in molten KF. done clear
  C)
   Reduction of \[BC{{l}_{3}}\]with \[{{H}_{2}}\]at 1270 K. done clear
  D)
   thermal decomposition of boranes at 1173 K. done clear
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• question_answer15)
  \[C{{a}_{2}}{{B}_{6}}{{O}_{11}}+2N{{a}_{2}}C{{O}_{3}}\to X-2CaC{{O}_{3}}+2NaB{{O}_{2}}.\] The compound X in the above reaction is
  A)
  \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\]    done clear
  B)
  \[HB{{O}_{2}}\] done clear
  C)
  \[{{H}_{3}}B{{O}_{3}}\]        done clear
  D)
  \[{{H}_{2}}{{B}_{4}}{{O}_{7}}\] done clear
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• question_answer16)
  Which of the statement is true for the above sequence of reactions?
  A)
  Z is hydrogen done clear
  B)
   Y is \[LiB{{F}_{4}}\] done clear
  C)
   Z and Y are \[{{F}_{2}}\]and \[{{B}_{2}}{{H}_{6}}\] respectively done clear
  D)
   Z is potassium hydroxide done clear
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• question_answer17)
  A compound of boron X reacts at \[200{}^\circ C\]temperature with \[N{{H}_{3}}\]to give another compound Y which is called as inorganic benzene. The compound Y is a colourless liquid and is highly light sensitive. Its melting point is \[-57{}^\circ C\]. The compound X with excess of \[N{{H}_{3}}\] and at a still higher temperature gives boron nitride (\[{{(BN)}_{n}}\]). The compounds X and Y are respectively:
  A)
  \[B{{H}_{3}}\] and \[{{B}_{2}}{{H}_{6}}\] done clear
  B)
  \[NaB{{H}_{4}}\]and\[{{C}_{6}}{{H}_{6}}\] done clear
  C)
  \[{{B}_{2}}{{H}_{6}}\]and \[{{B}_{3}}{{N}_{3}}{{H}_{6}}\]           done clear
  D)
   \[{{B}_{4}}{{C}_{3}}\]and \[{{C}_{6}}{{H}_{6}}\] done clear
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• question_answer18)
  Consider following statements:

  I: In diamond, each carbon atom is linked tetratedrally to four other carbon atoms by \[s{{p}^{3}}\]bonds.

  II: Graphite has planar hexagonal layers of carbn atoms held together by planar hexagonal layers of carbon atoms held together by weak van der Waals forces.

  III: Silicon exists only in diamond structure due to its tendency to form \[p\pi \]-\[p\pi \]bonds to itself.

  A)
  Only I and II are correct done clear
  B)
   Only I is Correct done clear
  C)
   Only II and III are correct done clear
  D)
   All are correct statement done clear
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• question_answer19)
  Prussic acid \[+{{O}_{2}}\xrightarrow{Ag}\] The products of the above reaction are:
  A)
  \[{{C}_{2}}{{N}_{2}},{{H}_{2}}O\]   done clear
  B)
  \[C{{O}_{2}},{{H}_{2}}O\] done clear
  C)
  \[CO,C{{o}_{2}},{{H}_{2}}O\] done clear
  D)
  \[C{{O}_{2}},{{N}_{2}},{{H}_{2}}O\]  done clear
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• question_answer20)
  The number and types of bonds between two carbon atoms in calcium carbide are
  A)
  One sigma, one pi done clear
  B)
   One sigma, two pi done clear
  C)
   Two sigma, one pi done clear
  D)
   Two sigma, two pi done clear
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• question_answer21)
  The coordination number of A1 in the crystalline state of \[AlC{{l}_{3}}\] is _______.
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• question_answer22)
  Total no. of substance which contain hexagonal planer rings in their structures graphite, \[{{(BN)}_{x}},\]\[{{B}_{3}}{{N}_{3}}{{H}_{6}},\,{{C}_{6}}{{H}_{6}},\]\[{{B}_{2}}{{H}_{6}},{{H}_{3}}{{P}_{3}}{{O}_{9}}\]:
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• question_answer23)
  In borax (\[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.\,10{{H}_{2}}O\]) the number\[B-O-B\]bonds is?
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• question_answer24)
  Total number of oxygen atoms(s) which act (s) as bridge between any two silicon atoms in a mineral with composition MM? \[S{{i}_{3}}{{P}_{x}}\](M=divalent metal ion and M?=tetravalent metal ion).
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• question_answer25)
  In the compound \[N{{a}_{2}}[{{B}_{4}}{{O}_{5}}{{(OH)}_{4}}].8{{H}_{2}}O,\]if the

  (i) Number of \[B-O-B\]bonds is 'x'

  (ii) Number of \[B-B\]bonds is 'Y'

  (iii) Number of \[s{{p}^{2}}\]hybridized B atoms is 'Z' Calculate the value of \[x+y+z.\]

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