UPSC Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank

done Elements Classification and Chemical Bonding Total Questions - 40

• question_answer1)
  The early attempt to classify elements as metals and non-metals was made by
  A)
  Mendeleev              done clear
  B)
  Lother Meyer done clear
  C)
  Lavoisier                done clear
  D)
         Henry Moseley done clear
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• question_answer2)
        The long form of periodic table consists of
  A)
  seven periods and eight groups done clear
  B)
  seven periods and eighteen groups done clear
  C)
  eight periods and eighteen groups done clear
  D)
  eighteen periods and eight groups done clear
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• question_answer3)
        Which one of the following is most electropositive element?
  A)
  Sodium     done clear
  B)
         Calcium done clear
  C)
  Aluminium             done clear
  D)
         Silicon done clear
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• question_answer4)
        Which of the following is not isoelectronic with \[{{O}^{2-}}\]?
  A)
  \[{{N}^{3-}}\]    done clear
  B)
                            \[N{{a}^{+}}\] done clear
  C)
  \[{{F}^{-}}\]                           done clear
  D)
         \[T{{i}^{+}}\] done clear
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• question_answer5)
  On the basis of following features identify correct option

  A. Gaps were left for undiscovered elements

  B. No correct position of hydrogen

  C. The isotopes of same element will be given different position

   
  A)
  Mendeleev's periodic table done clear
  B)
  Modem periodic table done clear
  C)
  Newland's arrangement of elements done clear
  D)
  Both [a] and [b] done clear
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• question_answer6)
        According to Newland's law of octaves, which element is the repetition of the first element in the periodic table?
  A)
  Oxygen     done clear
  B)
                   Nitrogen done clear
  C)
  Chlorine                           done clear
  D)
  Sulphur done clear
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• question_answer7)
        Which one of the following is a diagonally related pair?
  A)
  H, Be                  done clear
  B)
         Na, Mg done clear
  C)
  B, Si            done clear
  D)
  K, Ca done clear
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• question_answer8)
        Which element is more electronegative among halogens?
  A)
  Br                         done clear
  B)
         CI done clear
  C)
  F                done clear
  D)
         I done clear
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• question_answer9)
        Which of the following is correct set of Dobereiner Triads?
  A)
  Na, Si, CI          done clear
  B)
                   Be, Mg, Ca done clear
  C)
  F, CI, I                   done clear
  D)
         Li, Na, Be done clear
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• question_answer10)
        On moving horizontally across a period, the number of electrons in the outermost shell increases from ...... to.......
  A)
  2, 8                       done clear
  B)
         2, 18 done clear
  C)
  1, 8            done clear
  D)
         1, 18 done clear
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• question_answer11)
        Which of the following elements A, B, C, D and E with atomic number 3, 11, 15, 18 and 19 respectively belong to the same group?
  A)
  A, B, C                  done clear
  B)
         B, C, D done clear
  C)
  A, D, E                  done clear
  D)
         A, B, E done clear
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• question_answer12)
        Which of the following statement is not true about noble gases?
  A)
  They are non-metallic in nature done clear
  B)
  They exist in atomic form done clear
  C)
  They are radioactive in nature done clear
  D)
  Xenon is the most reactive among them done clear
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• question_answer13)
        Which among the following atoms has high atomic radi?
  A)
  Na                         done clear
  B)
         Rb done clear
  C)
  K                                    done clear
  D)
  Cs done clear
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• question_answer14)
        Which of the following is an actinide?
  A)
  Plutonium          done clear
  B)
         Polonium done clear
  C)
  Promethium        done clear
  D)
         Palladium done clear
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• question_answer15)
        Which one of these group of elements is also called the halogen family?
  A)
  Group 16          done clear
  B)
         Group 18 done clear
  C)
  Group 10          done clear
  D)
         Group 17 done clear
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• question_answer16)
        The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all -
  A)
  halogens            done clear
  B)
         noble gases done clear
  C)
  noble metals        done clear
  D)
        light metals done clear
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• question_answer17)
        Which one of the following properties changes with valency? [CDS]
  A)
  Atomic weight     done clear
  B)
         Equivalent weight done clear
  C)
  Molecular weight done clear
  D)
         Density done clear
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• question_answer18)
        The elements of a group in the periodic tabic [CDS]
  A)
  have similar chemical properties done clear
  B)
  have consecutive atomic numbers done clear
  C)
  are isobars done clear
  D)
  are isotopes done clear
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• question_answer19)
        Which element forms the highest number of compounds in the periodic table? [CDS]
  A)
  Carbon      done clear
  B)
         Oxygen done clear
  C)
  Silicon                   done clear
  D)
         Sulphur done clear
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• question_answer20)
        Which one of the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the periodic table? [CDS]
  A)
  Atomic size        done clear
  B)
         Valency done clear
  C)
  Radioactivity       done clear
  D)
         Electronegativity done clear
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• question_answer21)
        Which one of the following elements is a metalloid? [NDA]
  A)
  P                           done clear
  B)
         Al done clear
  C)
  As              done clear
  D)
         Po done clear
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• question_answer22)
        What is the correct increasing order of electronegativity for the most common oxidation states among the following elements? [NDA]
  A)
  F<O<N<C            done clear
  B)
  C<N<C<F done clear
  C)
  C<N<F<O        done clear
  D)
        C<N<O<F done clear
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• question_answer23)
        Consider the following statements with reference to the periodic table of chemical elements: [IAS Prelim]

  1. Ionisation potential gradually decreases along a period

  2. In a group of elements, electron affinity decreases as the atomic weight increases

  3. In a given period, electronegativity decreases as the atomic number increases

  Which of these statement (s) is/are correct?
  A)
  1 only                    done clear
  B)
         2 only done clear
  C)
  1 and 3            done clear
  D)
         2 and 3 done clear
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• question_answer24)
        The octet rule is not valid for which one of the following molecules? [NDA]
  A)
  \[C{{O}_{2}}\]                done clear
  B)
                   \[{{H}_{2}}S\] done clear
  C)
  \[N{{H}_{3}}\]                done clear
  D)
                   \[B{{F}_{3}}\] done clear
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• question_answer25)
        The rusting of iron nail [CDS]
  A)
  decreases its weight done clear
  B)
  increases its weight done clear
  C)
  does not affect weight but iron is oxidised done clear
  D)
  does not affect weight but iron is reduced done clear
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• question_answer26)
        Which one of the following when dissolved in \[{{H}_{2}}O\] gives hissing sound? [CDS]
  A)
  Limestone         done clear
  B)
                   Slaked lime done clear
  C)
  Soda lime          done clear
  D)
                   Quicklime done clear
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• question_answer27)
  Consider the following statements: [NDA]

  1. Maximum covalency of carbon is 4, whereas maximum covalency of silicon is 6.

  2. The maximum covalency of an element is limited to 6.

  Which of the statements given above is/are correct?

                                       
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  Both 1 and 2       done clear
  D)
  Neither 1 nor 2 done clear
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• question_answer28)
        An ionic compound when dissolved in water has produced \[m\,{{A}^{n-}},n\,{{B}^{m-}}\] ions. What is the formula of the compound? [NDA]
  A)
  \[{{A}_{m}}{{B}_{n}}\]         done clear
  B)
         \[{{A}_{n}}{{B}_{m}}\] done clear
  C)
  \[{{A}_{m}}{{B}_{m}}\]                   done clear
  D)
         \[{{A}_{n}}{{B}_{n}}\] done clear
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• question_answer29)
        What are the types of bonds present in\[CuS{{O}_{4}}.5{{H}_{2}}O\]? [NDA]
  A)
  Electrovalent and covalent done clear
  B)
  Electrovalent and coordinate covalent done clear
  C)
  Electrovalent, covalent, coordinate covalent and hydrogen bonds done clear
  D)
  Covalent and coordinate covalent done clear
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• question_answer30)
  Consider the following equation for the formation of ammonia from nitrogen and hydrogen: [NDA]  

  \[{{N}_{2}}+3{{H}_{2}}=2N{{H}_{3}}\]

  How many hydrogen molecules are required to react with 100 molecules of nitrogen?

   
  A)
  100                       done clear
  B)
  200 done clear
  C)
  300            done clear
  D)
  400 done clear
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• question_answer31)
        As compared to covalent compounds, electro valent compounds, generally have [NDA]
  A)
  low melting point and low boiling point done clear
  B)
  low melting point and high boiling point done clear
  C)
  high melting point and low boiling point done clear
  D)
  high melting point and high boiling point done clear
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• question_answer32)
        Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation? [NDA]
  A)
  Law of conservation of mass done clear
  B)
  Law of definite proportion done clear
  C)
  Law of multiple proportion done clear
  D)
  Avogadro?s law done clear
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• question_answer33)
        This question consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answer to these items using the codes given below. [NDA]

  Statement I: Conversion of blue copper sulphate to black cupric oxide on heating is a physical change.

  Statement II: A change in which chemical composition does not change is called physical change.

                                                       
  A)
  Both the statements individually true and Statement II is the correct explanation of Statement I. done clear
  B)
  Both the statements are individually true but Statement II is not correct explanation of Statement I. done clear
  C)
  Statement I is true but Statement II is false. done clear
  D)
  Statement I is false but Statement II is true. done clear
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• question_answer34)
        In \[KMn{{O}_{4}}\]molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively [NDA]
  A)
  +1, + 5, - 2        done clear
  B)
         +1, + 7, - 2 done clear
  C)
  0, 0, 0                done clear
  D)
                   +1, + 7, 0 done clear
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• question_answer35)
       

  In the reaction \[4Fe+3{{O}_{2}}\to 4F{{e}^{3+}}+6{{O}^{2-}}\] [NDA]

  Which of the following statements is incorrect?

  A)
  It is a redox reaction done clear
  B)
  Metallic iron acts as a reducing agent done clear
  C)
  \[{{O}_{2}}\]acts as an oxidising agent done clear
  D)
  Metallic iron is reduced to \[F{{e}^{3+}}\] done clear
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• question_answer36)
        Most of the explosions in mines occur due to the mixing of [IAS Prelim]
  A)
  hydrogen with oxygen done clear
  B)
  oxygen with acetylene done clear
  C)
  methane with air done clear
  D)
  carbon dioxide with ethane done clear
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• question_answer37)
  Match List-I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists : [IAS Prelim]

  List-I (Oxidation number)	List-II (The elements)
  A. 2 Mn in \[Mn{{O}_{2}}\]	1. Oxidation number of
  B. 3 S in \[{{H}_{2}}{{S}_{2}}{{O}_{7}}\]	2. Oxidation number of
  C. 4 Ca in CaO	3. Oxidation number of
  D. 6 AI in \[NaAI{{H}_{4}}\]	4. Oxidation number of

               
  A)
  A-3;   B-4;   C-1;   D-2      done clear
  B)
  A-4;   B-3;   C-1;   D-2 done clear
  C)
  A-3;   B-4;   C-2;   D-1      done clear
  D)
  A-4;   B-3;   C-2;   D-1 done clear
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• question_answer38)
        If a limestone piece is dipped in water, a bubble evolves. The bubbling is due to [CDS]
  A)
  hydrogen          done clear
  B)
                   oxygen done clear
  C)
  water vapour       done clear
  D)
         carbon dioxide done clear
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• question_answer39)
        Which one of the following reducing agents can also act as an oxidising agent? [CDS]
  A)
  \[{{H}_{2}}\]                  done clear
  B)
         \[{{H}_{2}}S\] done clear
  C)
  \[S{{O}_{2}}\]                done clear
  D)
         HI done clear
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• question_answer40)
        A woman desires to clean the surface of her gold ornaments by a chemical approach. For this she requires to use [CDS]
  A)
  aqua-regia done clear
  B)
  concentrated \[{{H}_{2}}S{{O}_{4}}\] done clear
  C)
  concentrated NaOH done clear
  D)
  sodium thiosulphate solution done clear
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