9th Class Science Structure of the Atom Question Bank

done Structure of Atom Total Questions - 20

• question_answer1)
  There are three isotopes of carbon which are named as C-12, C-13 and C-14 out of which C-12 is the most abundant isotope. In the given structures of three isotopes, what will be the composition of the nucleus?
  A)
  C -12 : 6p + 6n, C - 13 : 7p + 6n, C - 14 : 8p + 6n done clear
  B)
  C - 12 : 6p + 6n, C -13 : 6p + 7n, C - 14 : 6p + 8n done clear
  C)
  C - 12 : 6p + 6n, C - 13 : 5p + 8n, C - 14 : 7p + 7n done clear
  D)
  C - 12 : 6p + 6n, C - 13 : 12p +1n, C - 14 : 5p + 9n done clear
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• question_answer2)
  A thin sheet of gold foil is bombarded with \[\alpha \text{-particles}\]as in Rutherford's experiment. Which of the given descriptions most accurately represents the path of\[\alpha \text{-particles}\]?

  	Undeflected	No. of particles deflected through a small angle	No. of Particles deflected through a large angle
  I.	All	None	None
  II.	Most	A few	None
  III.	Most	A few	A few
  IV.	A few	Most	A few

  A)
  I                                   done clear
  B)
  II          done clear
  C)
  III                     done clear
  D)
         IV done clear
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• question_answer3)
  Three invisible radiations X, Y and Z are passed through an electric field. X goes straight, Y deviates towards the positive end while Z deviates towards the negative end. The particles present in X, Y and Z and the elm ratio for X are e/m ratio for X are
  A)

  X	Y	Z	e/m ratio for X
  \[\alpha \text{-particles}\]	\[\beta \text{-particles}\]	\[\gamma \text{-Rays}\]	0

                  done clear
  B)

  X	Y	Z	e/m ratio for X
  Neutrons	Electrons	Protons	0

                  done clear
  C)

  X	Y	Z	e/m ratio for X
  \[\alpha -Particles\]	\[\beta -Particles\]	\[\gamma -Rays\]	1

                  done clear
  D)

  X	Y	Z	e/m ratio for X
  Neutrons	Electrons	Protons	1

  done clear
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• question_answer4)
  Identify the \[A{{l}^{3+}}ion\] from the given structures.
  A)
  I                       done clear
  B)
         II          done clear
  C)
  III                     done clear
  D)
         IV done clear
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• question_answer5)
  There are two atomic species X and Y, such that

  Atomic species	X	Y
  Protons	8	8
  Neutrons	8	10

  Which of the following statements is true about X and Y?
  A)
  X and Y are isobars. done clear
  B)
  X and Y have different chemical properties. done clear
  C)
  X and Y have different physical properties. done clear
  D)
  All are correct. done clear
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• question_answer6)
  Match column I with column II and select the correct option from the codes given below.

  Column I	Column II
  (a) Ions	(i) Same mass number, different atomic numbers
  (b) Isobars	(ii) Same number of neutrons, different atomic numbers, different mass numbers
  (c) Isotopes	(iii) Formed by loss or gain of electrons
  (d) Isotones	(iv) Combining capacity of an atom
  (e) Valency	(v) Same atomic number, different mass numbers.

  A)
  (a)-(i), (b)-(iii), (c)-(v), (d)-(ii), (e)-(iv) done clear
  B)
  (a)-(iii), (b)-(i), (c)-(v), (d)-(ii), (e)-(iv) done clear
  C)
  (a)-(iii), (b)-(v), (c)-(i), (d)-(ii), (e)-(iv) done clear
  D)
  (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(v) done clear
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• question_answer7)
  A brief information about two atoms

  X and Y is given: X: Atomic number = 7, Mass number = 14

  Y: Atomic number = 7, Mass number = 15

  Which of the following is correct about these two atoms?
  A)
  Electronic configuration of X is 2, 8, 4 while that of Y is 2, 8, 5. done clear
  B)
  Both X and Y contain 7 neutrons. done clear
  C)
  X has 2 electron shells while Y has 3 electron shells. done clear
  D)
  Both X and Y have 5 valence electrons. done clear
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• question_answer8)

  An electron jumps from an orbit P to Q and loses energy. The same electron when jumps from R to Q, gains energy.

  The increasing order of distance of these orbits from the nucleus is

   
  A)
  P < Q < R                  done clear
  B)
  R < P < Q      done clear
  C)
  R < Q < P      done clear
  D)
  P < R < Q done clear
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• question_answer9)

  Few statements regarding the distribution of electrons in the energy shells are given.

  Which of the following statements is not correct?

   
  A)
  For fourth energy shell (N), the maximum number of electrons is 32 according to \[2{{n}^{2}}\] rule. done clear
  B)
  When N is the outermost shell of an atom, it can accommodate a maximum of 8 electrons only. done clear
  C)
  The filling of the fourth shell begins even before the third shell is completely filled. done clear
  D)
  Fifth shell can accommodate 50 electrons according to \[2{{n}^{2}}\] rule. done clear
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• question_answer10)
  Which of the following are isobars?
  A)
  I and II             done clear
  B)
  II and III           done clear
  C)
         I, II, IV and V done clear
  D)
         II, III, IV and V done clear
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• question_answer11)
  Read the given statements and mark the correct option.

  Statement 1: Bohr's orbits are called stationary orbits.

  Statement 2: Electrons remain stationary in these orbits for some time.

  A)
  Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
  Statement 1 is true and statement 2 is false. done clear
  D)
  Both statements 1 and 2 are false. done clear
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• question_answer12)
  In nature, the element boron occurs 19.9% as \[^{\text{10}}\text{B}\] and 80.1% as\[^{\text{11}}\text{B}\]. If the isotopic mass of \[^{\text{10}}\text{B}\] is 10.013 amu and that of \[^{11}\text{B}\] is 11.009 amu, the atomic mass of boron is
  A)
  10                                done clear
  B)
  11                    done clear
  C)
  10.8     done clear
  D)
         11.8 done clear
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• question_answer13)
  Which of the following statements are correct regarding the elements given below?

  \[_{\text{19}}^{\text{39}}\text{K, }_{\text{53}}^{\text{127}}\text{I,}\,\,_{\text{17}}^{\text{35}}\text{Cl,}\,\,_{\text{35}}^{\text{80}}\text{Br,}\,\,_{\text{18}}^{\text{40}}\text{Ar}\]

   

  I. The correct order of increasing proton number is \[\text{KClBrIAr}\]

  II. The correct order of increasing relative atomic mass is \[\text{ClKArBrI}\]

  III. There is difference in the orders of proton number and relative atomic mass.

  IV. The number of protons is equal to number of neutrons in all the given elements

   
  A)
  I and IV only    done clear
  B)
  II and IV only done clear
  C)
  I and III only done clear
  D)
  II and III only done clear
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• question_answer14)
  Hydrogen exists in three isotopic forms, \[_{\text{1}}^{\text{1}}\text{H,}\,\,_{\text{1}}^{\text{2}}\text{H,}\,\,_{\text{1}}^{\text{3}}\text{H}\] respectively known as protium, deuterium and tritium. Why are all the isotopes neutral in nature?
  A)
  Since neutrons are neutral in nature hence, isotopes are electrically neutral. done clear
  B)
  All the isotopes have one electron and one proton, hence they are neutral. done clear
  C)
  All the isotopes have one proton and one neutron, hence they are neutral. done clear
  D)
  Increasing number of protons in the isotopes make them neutral. done clear
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• question_answer15)
  Identify the difference between particles of each given pair.

  I. \[^{\text{6}}\text{Li}\] and \[^{7}\text{Li}\]

  II. \[^{\text{32}}\text{S}\] and \[^{\text{32}}{{\text{S}}^{2-}}\]

  III. \[^{\text{39}}{{\text{K}}^{\text{+}}}\] and \[^{\text{40}}\text{C}{{\text{a}}^{\text{2+}}}\]

   
  A)

  I	II	III
  No. of Protons	No. of electrons	No. of Neutrons

  done clear
  B)

  I	II	III
  No. of electrons	No. of Protons	No. of neutrons

                  done clear
  C)

  I	II	III
  No. of neutrons	No. of electrons	No. of protons

  done clear
  D)

  I	II	III
  No. of protons	No. of neutrons	No. of electrons

  done clear
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• question_answer16)
  A compound of carbon, hydrogen and nitrogen contains these elements in the ratio 9 : 1 : 3.5. If its molecular mass is 108, what is the molecular formula?
  A)
  \[{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\text{N}\]                       done clear
  B)
  \[{{\text{C}}_{\text{3}}}{{\text{H}}_{\text{4}}}\text{N}\]           done clear
  C)
         \[{{\text{C}}_{\text{2}}}\text{H}{{\text{N}}_{\text{2}}}\]           done clear
  D)
         \[{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{8}}}{{\text{N}}_{\text{2}}}\]                    done clear
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• question_answer17)
  Which of the given pairs of atoms contain(s) the same number of neutrons?

  I.  \[_{\text{48}}^{\text{114}}\text{Cd}\] and \[_{50}^{\text{119}}\text{Sn}\]

  II. \[_{\text{27}}^{\text{59}}\text{Co}\] and \[_{\text{28}}^{\text{59}}\text{Ni}\]

  III.  \[_{\text{55}}^{\text{133}}\text{Cs}\] and \[_{\text{54}}^{\text{132}}\text{Xe}\]

  IV. \[_{\text{29}}^{\text{63}}\text{Cu}\] and \[_{\text{29}}^{\text{65}}\text{Cu}\]

  A)
  I and IV only    done clear
  B)
  I and III only done clear
  C)
         III only  done clear
  D)
         IV only done clear
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• question_answer18)
  Description of a few atoms is given in the table.

  Atom	P	Q	R	S
  No. of protons	17	11	17	9
  No. of neutrons	18	12	20	10
  No. of electrons	17	10	17	10

  Identify a cation, an anion and a pair of isotopes from the given table.
  A)

  Cation	Anion	Pair of isotopes
  P	Q	P, Q

  done clear
  B)

  Cation	Anion	Pair of isotopes
  Q	S	P, R

  done clear
  C)

  Cation	Anion	Pair of isotopes
  R	P	R, S

  done clear
  D)

  Cation	Anion	Pair of isotopes
  Q	S	Q, S

  done clear
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• question_answer19)

  Study the given mass spectrum of magnesium carefully.

  The number of protons in \[^{\text{26}}\text{Mg}\], number of neutrons in \[^{\text{25}}\text{Mg}\], and the relative atomic mass of Mg are respectively

     
  A)
  12, 13 and 25 done clear
  B)
  16, 12 and 24 done clear
  C)
  14, 13 and 25 done clear
  D)
  12, 13 and 24.32 done clear
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• question_answer20)

  Electron distribution of two elements P and Q in their outermost shell is shown below.

  Atomic numbers of P and Q are respectively

     
  A)
  9, 17                done clear
  B)
  15, 17  done clear
  C)
  24, 17  done clear
  D)
  17, 24 done clear
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