9th Class Science Structure of the Atom Question Bank

done Atomic Structure Formative Subjective Problems Total Questions - 43

• question_answer1)
                                                  Assertion: The specific charge of anode ray particles depends on nature of the gas taken in the discharge tube. Reason: The particles in anode rays carry positive charge. (a) Both assertion and reason are correct and reason is the correct explanation of assertion. (b) Both assertion and reason are correct and reason is not the correct explanation of assertion. (c) Assertion is correct and reason is incorrect. (d) Assertion is incorrect and reason is correct.
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• question_answer2)
  What is the ratio of mass of electron to that of proton?
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• question_answer3)
  How many number of electrons make 1 cgs unit of mass?
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• question_answer4)
  What is the mass of one mole (\[\text{6}.0\text{23}\times \text{1}{{0}^{\text{23}}}\]) electrons?
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• question_answer5)
  Faraday is the biggest unit of charge and is equal to 96500 coulomb. Find the number of electrons whose charge equal to the biggest unit of charge.
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• question_answer6)
  What is the ratio of specific charge (e/m) of an electron to that of a hydrogen ion?
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• question_answer7)
  The charge on an electron is\[\text{4}.\text{8}\times \text{1}{{0}^{-\text{1}0}}\]esu. What is the value of the charge on\[L{{i}^{+}}\]ion?
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• question_answer8)
  What is the ratio of specific charge of proton to that of an alpha particle? (Hint: mass of \[\alpha \]- particle\[=\text{4}\times \text{1}.\text{66}\times \text{1}{{0}^{-\text{24}}}\text{g}\])
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• question_answer9)
  The nuclear radius is of the order\[\text{1}{{0}^{-\text{13}}}\]cm while atomic radius is of the order\[\text{1}{{0}^{-\text{8}}}\]cm. Assuming the nucleus and the atom to be spherical, what fraction of atomic volume is occupied by the nucleus?
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• question_answer10)
  A moving particle should radiate energy continuously; likewise a revolving electron should also radiate energy continuously and fall into the nucleus and the atom should collapse. Explain.
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• question_answer11)
  Find the ratio of energies of two radiations, one with a wavelength of 400 nm and the other with that of 800 nm.
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• question_answer12)
  Find the number of photons of light with wavelength 4000pm that provide U of energy.
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• question_answer13)
  \[\text{3}\times \text{1}{{0}^{\text{18}}}\]photons of a certain light radiation are found to produce 1.5 J of energy. Calculate the wavelength of light radiations, (\[\text{h}=\text{6}.\text{63}\times \] \[\text{1}{{0}^{-\text{34}}}\] Js).
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• question_answer14)
  An electron cannot occupy an intermediate orbit between n = 2 and n = 3. Give reason.
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• question_answer15)
  Find the angular momentum of first orbit of hydrogen atom.
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• question_answer16)
  Find the momentum and kinetic energy of an electron revolving in the first orbit of hydrogen atom, whose radius is\[0.\text{529}\overset{{}^\circ }{\mathop{\text{A}}}\,\].
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• question_answer17)
  The radii of first and second orbit of Helium atom are\[{{r}_{1}}\]and\[{{r}_{2}}\]respectively. The ratio of the velocities of the electrons revolving in their orbits is ___.
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• question_answer18)
  1 S.I. unit of 'h' = ________C.GS. units of 'h' .
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• question_answer19)
  Five atoms are labeled as follows:

  Atoms	A	D	C	L	S
  A	40	19	7	16	20
  Z	20	9	3	8	10

  (i) Find the ratio of their no. of neutrons (ii) Identify the atoms in which \[\frac{A}{Z}>2\]   (iii) Identify the atoms in which \[\frac{A}{2Z}=1\]
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• question_answer20)
                                          Except for the symbols of the elements, all the remaining information for the following elements is correct. Fill in the remaining blanks.    
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• question_answer21)
  Find the number of neutrons present in di-positively charged zinc ion with mass number 70.
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• question_answer22)
  What is the ratio of number of neutrons in silicon to phosphorus?
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• question_answer23)
  Find the number of electrons, protons and neutrons present in: (a) Nitrate ion                    (b) Sulphate ion
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• question_answer24)
  Atoms consist of electrons, protons and neutrons. If the mass attributed to neutrons were halved and that attributed to the electrons were doubled, atomic mass of \[_{6}^{12}C\] would be approximately: (a) same                              (b) doubled (c) halved                            (d) reduced by 25%
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• question_answer25)
  The\[H{{D}^{+}}\]ion contains (a) 1 proton, 1 neutron, 1 electron (b) 2 protons, 1 neutron, 2 electrons (c) 2 protons, 2 neutrons, 0 electron (d) 2 protons, I neutron, I electron
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• question_answer26)
  Write the electronic configuration of phosphorus.
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• question_answer27)
  Write the electronic configuration of calcium.
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• question_answer28)
  According to Bohr-Bury rules The electronic configuration of a tripositively charged ion \[({{X}^{+3}})\]is 2, 8. (a) Identify the element and find the number of neutrons in it. (b) Write the formula of the compound that it forms with chlorine and oxygen respectively.
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• question_answer29)
  The electronic configuration of a di-positive metal ion \[{{M}^{2+}}\]is 2, 8, 14 and its mass number is 56. Find the number of neutrons in its nucleus.
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• question_answer30)
  A tripositively charged ion of an element 'X' has the same number of electrons as in trinegatively charged \[{{\text{N}}^{-\text{3}}}\]. Identify 'X'.
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• question_answer31)
  Assume that the formula to calculate the maximum number of electrons has been changed from \[\text{2}{{\text{n}}^{\text{2}}}\] to\[\text{3}{{\text{n}}^{\text{3}}}\]. If an orbit can accommodate a maximum of 81 electrons, then identify the orbit number.
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• question_answer32)
  Match the following:

  Element	Electronic configuration
  (p) Potassium	(a) 2, 5
  (q) Nitrogen	(b) 2, 8, 8, 1
  (r) Chlorine	(c) 2, 8, 7

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• question_answer33)
  Which of the following species has the same number of electrons in the outermost and penultimate shells? (a) \[{{\text{O}}^{\text{2}-}}\]                   (b) \[{{K}^{+}}\] (c) \[A{{l}^{3+}}\]                             (d) \[{{\text{F}}^{-}}\]
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• question_answer34)
  Find the maximum number of electrons that can be accommodated in M-shell.
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• question_answer35)
  Name the shell that can accommodate 32 electrons.
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• question_answer36)
  Find the total number of electrons that can be accommodated in \[{{7}^{th}}\]orbit.
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• question_answer37)
  The total number of electrons in \[NO_{3}^{-}\]ion is (a) 15                                     (b) 32    (c) 31                                     (d) 46
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• question_answer38)
  Select the isotopes, isobars and isotones from the following: (Note: the symbols are hypothetical) \[_{1}{{A}^{1}}{{,}_{3}}{{D}^{7}}{{,}_{1}}{{C}^{3}}{{,}_{6}}{{L}^{12}}{{,}_{5}}{{B}^{12}}{{,}_{4}}{{E}^{8}}{{,}_{6}}{{S}^{14}}{{,}_{2}}{{T}^{4}}\]
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• question_answer39)
  The ion that is iso-electronic with CO is: (a) \[O_{2}^{-}\]                                               (b) \[N_{2}^{+}\] (c) \[C{{N}^{-}}\]                              (d) \[O_{2}^{+}\]
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• question_answer40)
  Which of the following triads represents isotones? (a) \[_{6}^{12}C,_{6}^{13}C,_{6}^{14}C\]                              (b) \[_{18}^{40}Ar,_{20}^{42}Ca,_{21}^{43}Sc\] (c) \[_{18}^{40}Ar,_{20}^{40}Ca,_{21}^{41}Sc\]  (d) \[_{7}^{14}N,_{8}^{60}O,_{9}^{18}F\]
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• question_answer41)
  \[{{X}^{3-}}\]is isoelectronic with argon. It has electrons and neutrons in 1 : 1 ratio. The mass number of 'X' is (a) 30                                     (b) 32 (c) 33                                     (d) 35
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• question_answer42)
  The set of nuclei that are isotonic is (a) \[_{6}{{C}^{12}}{{,}_{7}}{{N}^{14}}{{,}_{8}}{{O}^{16}}\]            (b) \[_{6}{{C}^{14}}{{,}_{7}}{{N}^{15}}{{,}_{8}}{{O}^{16}}\] (c) \[_{6}{{C}^{14}}{{,}_{7}}{{N}^{14}}{{,}_{8}}{{O}^{18}}\]            (d) \[_{6}{{C}^{14}}{{,}_{7}}{{N}^{15}}{{,}_{8}}{{O}^{18}}\]
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• question_answer43)
  Among the following groupings which represents the collection of isoelectronic species? (a) \[N{{O}^{+}},CO_{2}^{2-},O_{2}^{-},CO\]      (b) \[{{N}_{2}},C_{2}^{2-},CO,NO\] (c) \[CO,N{{O}^{+}},C{{N}^{-}},C_{2}^{2-}\]         (d) \[NO,C{{N}^{-}},{{N}_{2}},O_{2}^{-}\]
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