MCQ Questions of Structure of the Atom | Chemistry and Biology

Q1) Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of

(A) electron

(B) proton

(C) nucleus in the atom

(D) atomic mass

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Q2) Which of the following correctly represents the electronic distribution in the Mg atom?

(A) 3, 8, 1

(B) 2, 8, 2

(C) 1, 8, 3

(D) 8, 2, 2

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Q3) The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

(A) 13

(B) 10

(C) 14

(D) 16

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Q4) The first model of an atom was given by

(A) N. Bohr

(B) E. Goldstein

(C) Rutherford

(D) J.J. Thomson

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Q5) Which of the following statement is always correct?

(A) An atom has equal number of electrons and protons.

(B) An atom has equal number of electrons and neutrons.

(C) An atom has equal number of protons and neutrons.

(D) An atom has equal number of electrons, protons and neutrons.

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Q6) Which of the following isotope is used in the treatment of blood cancer?

(A) P-32

(B) I-131

(C) Co-60

(D) any of these

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Q7) An alpha particle is also known as:

(A) subatomic particle

(B) an unionised helium atom

(C) a neutral particle

(D) a doubly-charged helium ion

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Q8) What prevents an atom from being collapsed?

(A) The nuclear forces

(B) Movement of electrons in discrete energy levels

(C) The electron-electron repulsions

(D) All of these

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Q9) Which of the following pairs are isobars?

(A) 17Cl35 & 17Cl37

(B) 18Ar40 & 20Ca40

(C) 6C12 & 6C14

(D) None of these

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Q10) Which radioactive element is used in the treatment of cancer?

(A) Iodine-131

(B) Uranium-234

(C) Plutonium-239

(D) Cobalt-60

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Q11) Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?

(A) Some of the α-particles rebound after hitting the gold foil

(B) Some of the particles deflected from their path

(C) Some of the particles not pass through the gold foil

(D) Most of the particles pass straight through the gold foil

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Q12) Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?

(A) Some of the α-particles rebound after hitting the gold foil

(B) Some of the particles deflected from their path

(C) Some of the particles not pass through the gold foil

(D) Most of the particles pass straight through the gold foil

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Q13) Which scientist gave the concept of fixed energy levels around the nucleus?

(A) Ernest Rutherford

(B) J.J.Thomsan

(C) Neils Bohar

(D) None

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Q14) Which of the two will be chemically more reactive, Sulphur(S) with atomic number 16 or Chlorine (Cl) with atomic number 17?

(A) Chlorine

(B) Sulphur

(C) Both are equally reactive

(D) Can’t say

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Q15) How many electrons are present in M-shell of an element with atomic number 20?

(A) 5

(B) 8

(C) 12

(D) 18

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Q16) What property of an element determines its chemical behaviour?

(A) Size of an element

(B) Valency of an element

(C) Molar mass of the element

(D) None of these

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Q17) What prevents an atom from being collapsed?

(A) The nuclear forces

(B) Movement of electrons in discrete energy levels

(C) The electron-electron repulsions

(D) All of these

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Q18) The charge on an electron is equal to:

(A) 1.6 × 10^-19 C of -ve charge

(B) 2.6 × 10^-19 C of -ve charge

(C) 1.6 × 10^-22 C of -ve charge

(D) 1.6 × 10^-23 C of -ve charge

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Q19) An alpha particle is also known as:

(A) subatomic particle

(B) an unionised helium atom

(C) a neutral particle

(D) a doubly-charged helium ion

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Q20) Isobars do not differ in the number of

(A) protons

(B) electrons

(C) neutrons

(D) nucleons

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9th Class - Chemistry and Biology | Chapter: Structure of the Atom MCQs

Q1) Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of

Q2) Which of the following correctly represents the electronic distribution in the Mg atom?

Q3) The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

Q4) The first model of an atom was given by

Q5) Which of the following statement is always correct?

Q6) Which of the following isotope is used in the treatment of blood cancer?

Q7) An alpha particle is also known as:

Q8) What prevents an atom from being collapsed?

Q9) Which of the following pairs are isobars?

Q10) Which radioactive element is used in the treatment of cancer?

Q11) Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?

Q12) Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?

Q13) Which scientist gave the concept of fixed energy levels around the nucleus?

Q14) Which of the two will be chemically more reactive, Sulphur(S) with atomic number 16 or Chlorine (Cl) with atomic number 17?

Q15) How many electrons are present in M-shell of an element with atomic number 20?

Q16) What property of an element determines its chemical behaviour?

Q17) What prevents an atom from being collapsed?

Q18) The charge on an electron is equal to:

Q19) An alpha particle is also known as:

Q20) Isobars do not differ in the number of

Subjects (9th Class)

Chapters (Chemistry and Biology)