1st Year Chemistry Chapter 2 TestAtomic Structure

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Element is typically used to dope silicon to create a p-type semiconductor:

   1. Group 1 element

   2. Group 14 element

   3. Group 13 element

   4. Group 15 element

2. Ionization energy for

   1. 738 kJ mol^-1

   2. 448 kJmol^-1

   3. 238 kJmol^-1

   4. 138 kJmol^-1

3. Incorrect orders with respect to relative energy is:

   1. 2s < 2p

   2. 2p < 3s

   3. 3p < 3d

   4. 4d < 3s

4. The outer electronic configuration of an element is 4s² 3d¹⁰ 4p⁵ .This element belongs to:

   1. Group 15, Period 4

   2. Group 17, Period 4

   3. Group 7, Period 3

   4. Group 16, Period 4

5. Substance that has different resistances to the passage of an electric current under different circumstances is:

   1. Conductor

   2. Liquid crystal

   3. Semi-conductor

   4. Non conductor

6. Arrange the following ions in order of increasing ionic radius:Br^- , Rb⁺ , Se^2- , Sr²⁺, Te^2-

   1. Sr²⁺ < Rb⁺ < Br^- < Se^2- < Te^2-

   2. Br^- < Sr²⁺ < Se^2- < Te^2- < Rb⁺

   3. Rb⁺ < Sr²⁺ < Se^2- < Te^2- < Br^-

   4. Rb⁺ < Br^- < Sr²⁺ < Se^2- < Te^2-

7. Identity of an atom if the number of electrons changes but the protons remain the same:

   1. The atom becomes a different element

   2. The nucleon number changes

   3. The atom becomes an isotope

   4. The atom becomes an ion

8. Which of the following formula is used to determine number of electrons in a sub shell:

   1. 2n²

   2. 

   3. n-l

   4. 

9. According to rule. Which one of the following has the highest energy?

   1. 2s

   2. 3s

   3. 3p

   4. 2p

10. Two atoms have the same atomic number but different nucleon numbers. What can be concluded?

    1. They are different elements

    2. They have different numbers of protons

    3. They are isotopes of the same element

    4. They have the same number of neutrons