Chemistry - Atomic Structure

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Question - 1

Which of the following is a correct statement about proton?

  • A It is nucleus of deuterium
  • B It is an ionised hydrogen atom
  • C It is an ionised hydrogen molecule
  • D It is a particle

Question - 2

The discovery of neutron became very late because

  • A it is present in nucleus
  • B it is a fundamental particle
  • C it does not move
  • D it does not carry any charge

Question - 3

The absolute value of charge on electron was determined by

  • A JJ Thomson
  • B Rutherford
  • C Priestly
  • D RA Millikan

Question - 4

Match the Column I with Column II.

Column I Column II
A. Proton 1. Rutherford
B. Electron 2. Chadwick
C. Neutron 3. Thomson
D. Nucleus 4. Goldstein
  • A A B C D 4 3 2 1
  • B A B C D 3 2 1 4
  • C A B C D 2 1 4 3
  • D A B C D 1 4 3 2

Question - 5

Match the column I and Column II and select the correct answer using the codes given below the columns.

Column I

(Characteristic)

Column II

(Particle)
A. Zero mass 1. Positron
B. Fractional charge 2. Neutrino
C. Fractioal spin 3. Quark
D. Integral spin 4. Photon
  • A A B C D 2 3 1 4
  • B A B C D 3 2 4 1
  • C A B C D 2 3 4 1
  • D A B C D 3 2 1 4

Question - 6

Consider the following statements in respect of hydrogen atom

It can attain the stability

1. by losing an electron

2. by gaining an electron

3. by forming an electron pair with other atom

Which of the statements given above are correct?

  • A 1 and 3 only
  • B 1 and 2 only
  • C 2 and 3 only
  • D 1,2 and 3

Question - 7

Which of the following p[air(s) is /are correctly matched?

1. Isotopes Atoms with same atomic number but different atomic mass.

2. Isobars  Atoms with same number of neutrons but different atomic number.

3. Isotones  Atoms with same mass number but different atomic number.

Select the correct answer using the codes given below.

  • A 1,2 and 3
  • B Only 1
  • C 1 and 2
  • D Only 2

Question - 8

Two atoms are said to be isotopes if

  • A they have the same atomic number, but different mass number
  • B they have the same number of neutrons, but different mass number
  • C the sum of the number of protons and neutrons is the same but the number of protons is different
  • D they have the same number of neutrons, but different modes of radoactive decay

Question - 9

Which of the recent developments has proved the existence of atoms?

  • A Scanning tunneling microscopy
  • B X-ray diffraction
  • C Infrared spetroscopy
  • D Mass spectroscopy

Question - 10

The number of unpaired electrons in Mn2+ is

  • A 1
  • B 3
  • C 4
  • D 5
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