Class 11 Chemistry

1. The modern periodic law was given by:

• A. Henry Moseley
• B. Dmitri Mendeleev
• C. John Newlands
• D. Johann Dobereiner

2. Modern periodic law states that physical and chemical properties of elements are periodic functions of their:

• A. Atomic numbers
• B. Atomic masses
• C. Mass numbers
• D. Densities

3. How many periods and groups are present in the long form of the periodic table?

• A. 7 periods and 18 groups
• B. 6 periods and 16 groups
• C. 7 periods and 8 groups
• D. 8 periods and 18 groups

4. Which of the following element blocks contains metals, non-metals, and metalloids?

• A. p-block
• B. s-block
• C. d-block
• D. f-block

5. Elements present in Group 17 of the periodic table are commonly known as:

• A. Halogens
• B. Alkali metals
• C. Chalcogens
• D. Noble gases

6. General electronic configuration of d-block elements is:

• A. (n-1)d¹⁻¹⁰ ns¹⁻²
• B. (n-1)d¹⁻¹⁰ ns² np⁶
• C. ns¹⁻² np¹⁻⁶
• D. (n-2)f¹⁻¹⁴ ns²

7. Which of the following element has the highest electronegativity?

• A. Fluorine (F)
• B. Chlorine (Cl)
• C. Oxygen (O)
• D. Nitrogen (N)

8. Which element has the maximum negative electron gain enthalpy?

• A. Chlorine (Cl)
• B. Fluorine (F)
• C. Bromine (Br)
• D. Oxygen (O)

9. Moving down a group in the periodic table, atomic radius generally:

• A. Increases
• B. Decreases
• C. Remains constant
• D. First decreases then increases

10. Across a period from left to right, ionization enthalpy generally:

• A. Increases
• B. Decreases
• C. Remains same
• D. First increases then decreases

11. What is the IUPAC official name for the element with atomic number 104?

• A. Rutherfordium
• B. Dubnium
• C. Seaborgium
• D. Bohrium

12. Which element belongs to the 3d transition series?

• A. Iron (Fe)
• B. Silver (Ag)
• C. Gold (Au)
• D. Mercury (Hg)

13. Which of the following is an amphoteric oxide?

• A. Al₂O₃
• B. Na₂O
• C. SO₃
• D. CaO

14. The diagonal relationship is observed between elements of:

• A. 2nd and 3rd period
• B. 1st and 2nd period
• C. 3rd and 4th period
• D. 4th and 5th period

15. Among the following species, which one has the smallest ionic size?

• A. Al³⁺
• B. Mg²⁺
• C. Na⁺
• D. F⁻

16. The screening effect of d-electrons is:

• A. Less than p-electrons
• B. Equal to s-electrons
• C. Greater than s-electrons
• D. Equal to p-electrons

17. Which group elements are called Alkali Metals?

• A. Group 1
• B. Group 2
• C. Group 16
• D. Group 18

18. Lanthanoids and Actinoids are placed in which block of the periodic table?

• A. f-block
• B. d-block
• C. p-block
• D. s-block

19. The IUPAC temporary symbol for element with atomic number 120 is:

• A. Ubn
• B. Unn
• C. Ube
• D. Ubo

20. The first ionization enthalpy of Nitrogen is higher than Oxygen because:

• A. Nitrogen has extra stability due to half-filled p-subshell
• B. Nitrogen is smaller in size than oxygen
• C. Oxygen has more nuclear charge
• D. Nitrogen is a gas

21. Which element has the highest first ionization enthalpy in the periodic table?

• A. Helium (He)
• B. Fluorine (F)
• C. Neon (Ne)
• D. Hydrogen (H)

22. Which of the following oxides is most basic in nature?

• A. Na₂O
• B. MgO
• C. Al₂O₃
• D. SiO₂

23. Dobereiner's Law of Triads was based on:

• A. Atomic mass
• B. Atomic number
• C. Valency
• D. Number of electrons

24. Newlands' Law of Octaves was applicable up to which element?

• A. Calcium
• B. Potassium
• C. Iron
• D. Cobalt

25. Valence electron configuration of alkali metals is:

• A. ns¹
• B. ns²
• C. ns² np¹
• D. ns² np⁵

26. Which element exhibits diagonal relationship with Beryllium (Be)?

• A. Aluminium (Al)
• B. Lithium (Li)
• C. Magnesium (Mg)
• D. Silicon (Si)

27. An element with atomic number 17 belongs to which period and group?

• A. Period 3, Group 17
• B. Period 2, Group 17
• C. Period 3, Group 7
• D. Period 4, Group 17

28. Which of the following properties generally decreases across a period from left to right?

• A. Metallic character
• B. Ionization enthalpy
• C. Electronegativity
• D. Non-metallic character

29. The size of an anion is always:

• A. Larger than its parent atom
• B. Smaller than its parent atom
• C. Equal to its parent atom
• D. Half of its parent atom

30. Noble gases have zero or positive electron gain enthalpy because of their:

• A. Completely filled stable electronic configuration
• B. Small size
• C. Low ionization enthalpy
• D. High electronegativity