Chemistry Class 10 Quiz

Multiple Choice Questions (Q1-Q5)

• Q1: The electron configuration of potassium is 2, 8, 8, 1. (a)
• Q2: Noble gases are in Group 18. (d)
• Q3: Group 1 elements are highly reactive because they have one electron in their outer shell. (a)
• Q4: The compound formed when chlorine reacts with hydrogen is hydrogen chloride. (b)
• Q5: Calcium is found in Period 4. (c)

Fill in the Gaps (Q6-Q10)

• Q6: The electron configuration of calcium is 2, 8, 8, 2.
• Q7: Elements in the same group have the same number of electrons in their outer shell.
• Q8: Group 1 elements react with water to form alkalis and hydrogen gas.
• Q9: The period number represents the number of occupied electron shells in an element.
• Q10: Noble gases are the least reactive group of elements because they have a full outer shell.

True/False (Q11-Q15)

• Q11: True. Group 7 elements are also known as halogens.
• Q12: False. Noble gases are inert (not reactive) because they have full outer shells
• Q13: False. The reactivity of Group 1 elements increases as you go down the group.
• Q14: True. Elements in the same period have the same number of electron shells.
• Q15: True. Potassium is more reactive than lithium.

Short Answer Questions (Q16-Q20)

• Q16: Elements in the same group have similar chemical properties due to having the same number of electrons in their outer shell, thus leading to similar reactivity patterns.
• Q17: Noble gases are considered inert because their outer electron shells are full, making them stable and unreactive.
• Q18: Group 1 elements are highly reactive, readily losing their single outer electron. Group 7 elements are also reactive, readily gaining an electron to complete their outer shell. Their reactivities differ significantly.
• Q19: The reactivity of halogens decreases as you move down Group 7. This is because the outer electrons are further from the nucleus and experience less attraction.
• Q20: Elements form ions to achieve a stable electron configuration, typically a full outer shell. This stable configuration allows them stability, similar to noble gases.

Test your knowledge of chemistry with this quiz designed for 10th-grade students. It covers topics such as electron configurations, group properties of elements, and reactivity of substances. Answer multiple choice, fill-in-the-gap, and true/false questions to gauge your understanding!