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Atomic Structure and Chemical Bonding

Description: Atomic Structure and Chemical Bonding Test covers chemistry questions for practice
Number of Questions: 15
Created by:
Tags: Chemistry Atomic structure questions Chemical bonding questions engineering exams engineering chemistry Hybridization Hybridisation and Its Types Atomic Structure and Chemical Bonding Chemical Bonding and Molecular Structure Geometry of Molecules,VSEPR Model VSEPR Theory Electronic Configuration and Atoms Electronic Arrangement in Quantum Mechanical Model Atomic Orbitals and Their Shapes Shapes of Orbitals
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Which of the following pairs of molecules have same hybridization?

  1. Methane and carbon dioxide

  2. Methane and ammonia

  3. Carbon dioxide and ammonia

  4. Boron trifluoride and water

  5. Ammonia and boron trichloride

Show answer
Correct Option: B
Explanation:

Correct option: Both methane and ammonia have sp3 hybridization.

Which of the following have tetrahedral geometry?

  1. CCl4
  2. SO4--
  3. SF4
  4. XeF4
  5. NH4+

  1. 1, 2 and 5

  2. 1, 4 and 5

  3. 2, 3 and 4

  4. 1, 3 and 5

  5. 3, 4 and 5

Show answer
Correct Option: A
Explanation:

CCl4, SO4-- and NH4+: All have sp3 hybridization and tetrahedral geometry.

Which of the following molecules does not have sp3 hybridization?

  1. Ammonia

  2. Water

  3. Methane

  4. Boron trihydride

  5. Chloroform

Show answer
Correct Option: D
Explanation:

Correct option. Boron trihydride (BH3) has sp2 hybridization.

C in ethene has which type of hybridization?

  1. sp

  2. sp2

  3. sp3

  4. dsp2

  5. sp3d2

Show answer
Correct Option: B
Explanation:

Correct option. C in ethene has sp2 hybridization.

Which of the following is the correct option about hybridization and shape of BF3?

  1. sp3, Tetrahedral

  2. sp, Linear

  3. sp2, Trigonal planar

  4. sp2, Trigonal pyramidal

  5. sp3, Tetrahedral

Show answer
Correct Option: C
Explanation:

Correct option. BF3 has sp2 hybridization and trigonal planar shape.

Bohr radius in pm (picometer) is _________.

  1. 56.3

  2. 52.9

  3. 25.9

  4. 52.2

  5. 65.3

Show answer
Correct Option: B
Explanation:

Bohr radius is 52.9 pm. 

Charge to mass ratio of electron was discovered for the first time by

  1. J. J. Thomson

  2. R.A. Millikan

  3. Michael Faraday

  4. Chadwick

  5. Henri Becquerel

Show answer
Correct Option: A
Explanation:

Correct option: J. J. Thomson measured charge to mass ratio of electron in 1897 for the first time.

Match entries in Group I with that in Group II and select the correct answer.

Group – I
Group – II
A. Isotope 1. Same number of neutrons
B. Isobar 2. Same number of protons
C. Isotone 3. Same number of neutrons and protons

  1. A - 1, B - 3, C - 2

  2. A - 2, B - 1, C - 3

  3. A - 2, B - 3, C - 1

  4. A - 3, B - 2, C - 1

  5. A - 1, B - 2, C - 3

Show answer
Correct Option: C
Explanation:

Correct option. Two atoms with same atomic number are isotopes. Two atoms same same atomic mass are isobars. Two atoms with same number of neutrons are isotones.

Choose the correct match with hybridization of carbon in these molecules.

Column – I
Column – II
A. sp2 1. Methane
B. sp3 2. Carbon dioxide
C. sp 3. Ethene

  1. A - 1, B - 3, C - 2

  2. A - 2, B - 3, C - 1

  3. A - 3, B - 1, C - 2

  4. A - 3, B - 2, C - 1

  5. A - 1, B - 2, C - 3

Show answer
Correct Option: C
Explanation:

Correct option. Methane has sp3, carbon dioxide sp and ethene has sp2 hybridization of carbon.

“No two electrons in an atom can have the same set of four quantum numbers”. This rule is called as

  1. Hund’s Rule

  2. Aufbau Principle

  3. Pauli Exclusion Principle

  4. Heisenberg’s Uncertainty Principle

  5. Bohr model

Show answer
Correct Option: C
Explanation:

Correct option: According to Pauli Exclusion Principle, no two electrons in an atom can have the same set of four quantum numbers.

Which of the following are isoelectronic species? A: Al+3 B: Cl- C: Mg+2 D: O-2

  1. A, B and C

  2. B, C and D

  3. A, C and D

  4. A, B and D

  5. A, B, C and D

Show answer
Correct Option: C
Explanation:

Yes, .Al+3, Mg+2, and O-2 are isoelectronic species as they all have same number of electrons (10 electrons).

Which of the following have same electronic configuration as Fe+3?

  1. Fe+2

  2. Mn+2

  3. V+2

  4. Cr+3

  5. Co+2

Show answer
Correct Option: B
Explanation:

Correct option. Both Fe+3 and Mn+2 have 5 electrons in d orbital.

Which of the following statements is/are correct? P: s orbitals are spherical in shape. Q: p orbitals are dumbbell shaped. R: d orbitals are spherical in shape.

  1. P and R

  2. Q and R

  3. P and Q

  4. Only P

  5. Only R

Show answer
Correct Option: C
Explanation:

It is correct, s orbitals are spherical and p orbitals are dumbbell shaped.

Electronic configuration in ground state of Cu is

  1. 1s2 2s2 2p6 3s2 3p6 4s2 3d9

  2. 1s2 2s2 2p6 3s2 3p6 4s2 3d8

  3. 1s2 2s2 2p6 3s2 3p6 4s1 3d9

  4. 1s2 2s2 2p6 3s2 3p6 4s1 3d10

  5. 1s2 2s2 2p6 3s2 3p6 4s2 3d10

Show answer
Correct Option: D
Explanation:

Correct option. Completely filled d orbitals are stable. 29Cu: 1s2 2s2 2p6 3s2 3p6 4s1 3d10

Which of the following molecules do not have linear shape?

  1. HCN
  2. C2H2
  3. CO2
  4. SO2 5. H2O

  1. 1 and 2

  2. 2 and 4

  3. 2, 3 and 4

  4. 4 and 5

  5. 3 and 4

Show answer
Correct Option: D
Explanation:

SO2 and H2O: Both have bent shape. CO2: Linear shape SO2: Bent shape

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