Chapter Exam

Chapter 5: Alkali and Alkaline Earth Metals — Online MCQ Test

Q: Which alkali metal is the most abundant in the Earth's crust?

Answer: A. Sodium — Sodium is the most abundant alkali metal in the Earth's crust. It commonly occurs as sodium chloride, sodium carbonate, and other minerals.

Q: The general electronic configuration of alkali metals is:

Answer: A. ns1 — Group 1 elements have one electron in the outermost s-orbital, so their general configuration is ns1.

Q: Which alkali metal reacts most vigorously with water among the following?

Answer: D. Rubidium — Reactivity increases down Group 1 due to decreasing ionization energy. Hence rubidium reacts more vigorously than lithium, sodium, and potassium.

Q: Which of the following compounds is used to permanently remove hardness of water?

Answer: B. Sodium carbonate — Sodium carbonate precipitates calcium and magnesium ions as insoluble carbonates. This helps in removing permanent hardness of water.

CHEMISTRY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 5: Alkali and Alkaline Earth Metals with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th CHEMISTRY. This chapter covers: Focusing on group 1 and 2 s-block elements this chapter covers physical and chemical trends extraction and biological importance. Students examine compounds of sodium calcium biolo.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 5: Alkali and Alkaline Earth Metals — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th CHEMISTRY — Chapter 5: Alkali and Alkaline Earth Metals, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which alkali metal is the most abundant in the Earth's crust?

A. Sodium ✓
B. Potassium
C. Lithium
D. Cesium

Answer: A. Sodium
Sodium is the most abundant alkali metal in the Earth's crust. It commonly occurs as sodium chloride, sodium carbonate, and other minerals.

The general electronic configuration of alkali metals is:

A. ns1 ✓
B. ns2
C. np1
D. ns2np1

Answer: A. ns1
Group 1 elements have one electron in the outermost s-orbital, so their general configuration is ns1.

Which alkali metal reacts most vigorously with water among the following?

A. Lithium
B. Sodium
C. Potassium
D. Rubidium ✓

Answer: D. Rubidium
Reactivity increases down Group 1 due to decreasing ionization energy. Hence rubidium reacts more vigorously than lithium, sodium, and potassium.

Which of the following compounds is used to permanently remove hardness of water?

A. Sodium chloride
B. Sodium carbonate ✓
C. Sodium hydroxide
D. Sodium nitrate

Answer: B. Sodium carbonate
Sodium carbonate precipitates calcium and magnesium ions as insoluble carbonates. This helps in removing permanent hardness of water.

Which statement about calcium is correct?

A. It is stored mainly in muscles and helps in nerve transmission
B. It is essential for blood clotting and bone formation ✓
C. It is the major intracellular cation in plants
D. It is responsible for the yellow colour in flame tests

Answer: B. It is essential for blood clotting and bone formation
Calcium is essential for bone and teeth formation and also plays an important role in blood clotting. It is one of the most important biologically significant elements.

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