Entry Test 2021 Chemistry Chemical Bonding MCQS Online Preparation Sample Paper 1 Questions with Answer

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Chemical Bonding, Ionic Bond, Bond Characteristics, Resonance in Chemical Bonding, Lewis Theory.

Various types of chemical bonds, such as ionic bonds, where electrons are transferred between atoms, resulting in charged ions being attracted to each other, are included in chemical bonds, which bind atoms together in molecules and compounds. Visit the Nokryan.com website for comprehensive information on chemistry bonding and associated topics, in order to learn more about these bonds typical of elements with a wide variety of electronegativities.

Chemical Bonding By Nokryan.com

1. Aluminum is in group III. Its oxide will have the formula?

  • AL₃O₂
  • AlO₂
  • AL₂O₃
    correct
  • ALO

2. Which one of the following correctly describes the trend in electro negativity?

  • Decrease across a period and decrease down a group
  • Increases across a period and decrease down a group
    correct
  • Decrease across a period and Increases down a group
  • Increases across a period and increases down a group

3. Molecular orbital picture of O₂ indicates:

  • One unpaired electron
  • No unpaired electron
  • Two unpaired electron
    correct
  • None of these

4. The atomic radius of hydrogen is 37 _____ choose the correct unit among the followings:

  • Micrometer
  • Picometer
    correct
  • Manometer
  • Angstrom

5. When two hydrogen atoms approach to form a chemical bond

  • The energy of atoms increases
  • The repulsive forces dominate the attractive forces
  • The attractive forces dominate the repulsive forces
    correct
  • The two atoms start ionization

6. Which of the following statements about positive ions is incorrect?

  • They are also known as cations
  • They are smaller than the atoms from which they were formed
  • They are larger than the atoms from which they were formed
    correct
  • They are formed when electrons are removed from atoms

7. A chemist poured lemon juice on soil. Which idea may he have in his mind?

  • Water should be preferred over lemon juice for drinking
  • There many be a possibility of a chemical reaction
    correct
  • Lemon juice is dangerous for health
  • There may note be a possibility of chemical reaction

8. Covalent bonds are least likely to be formed

  • Between atoms of the same element
  • Between atoms of different element on the right of the periodic table
  • Between an element in group I and an element in group VII
    correct
  • By head of the group elements with high ionization energies

9. Keeping in view the bonding molecular orbital, find the incorrect statement

  • Bonding molecular orbitals are formed when the electrons waves are undergo constructive interference
  • Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed
  • Bonding molecular orbitals have low electron density between the two nucleicorrect
  • Every electron in the bonding molecular orbital contributes to the attraction between atoms

10. Which one of the following statements about negative ions is incorrect?

  • They are also known as
  • They are larger than the atoms from which they were formed
  • They are smaller than the atoms from which they were formedcorrect
  • They are formed atoms gain electrons

11. In which one of the following does the central atom not possess an octet in its outer shell?

  • CH₄
  • NH₃
  • H₂O
  • BH₃
    correct

12. The elector negativity of elements in a period from left to right:

  • Decreases
  • First increases then decreases
  • First decreases then increases
  • Increases
    correct

13. Which of the bonds, shown by the _____ has the greatest polarity?

  • H – CI
  • H – OH
    correct
  • H – NH₂
  • H – SH

14. Which one of the following pairs of atoms is most likely to form an ionic bond?

  • C and F
  • O and F
  • Na and F
    correct
  • N and F

15. Which of the following has the greatest covalent character?

  • LiCIcorrect
  • KCI
  • RbCI
  • NaCI

16. The driving force for making a bond is to

  • Make solid compounds
  • Attain electronic configuration of noble gas
    correct
  • Make gascous substances
  • Make different compounds

17. All of the following statements are incorrect except

  • None of these
    correct
  • Scientific work must accurate, precision is not essential
  • Precision and accuracy should go side by side in a scientific work
  • Scientific work must be precise, accuracy is not essential

18. Formation of chemical bond between atoms of elements is based on

  • Electronegative character of elements
  • Electropositive character of elements
  • Pauli exclusion principle
  • Octet rulecorrect

19. Noble gases are:

  • Heavy substances
  • Light substances
  • Stable substances
    correct
  • Reactive substances

20. Chemical reactivity of element depends upon upon the number of

  • Valence shell electronscorrect
  • Protons is an atom of the element
  • Neutrons in an atom of the element
  • Electrons in all shells

21. Which of the following successive ionization energies belong to Group II elements?

  • 577,1820,2740,11600,14800
  • 736,1451,7740,10500,13600
    correct
  • 320,600,1110,1700,5650
  • 428,3070,4600,5860,7990

22. A students subtracted 0.00055 from 10.2345678 and reported the result as 10.23401. But his friend told him that result was wrong What is the correct result?

  • 10.234
  • 10.2340178
  • 10.234017
  • 10.23
    correct

23. Ionic radius in a period from left on right

  • First decreases then increases
    correct
  • Decreases
  • Increases
  • First increases then decreases

24. The twelve outer most electrons in O₂ molecule are distributed according to MOT as under. Find the correct one.

  • 12 in bonding molecular orbital and zero in anti bonding molecular orbital
  • 10 in bonding molecular orbital and 2 in anti bonding molecular orbital
  • 9 in bonding molecular orbital and 3 in anti bonding molecular orbital
  • 8 in bonding molecular orbital, 4 in anti bonding molecular orbitalcorrect

25. Molecular orbital picture of N₂ indicates

  • Two unpaired electron
  • One unpaired electron
  • None of these
  • No unpaired electron
    correct

Chemistry

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