Unit 2: S-Block Elements

What are S-Block Elements?

S-Block Elements refer to the group of elements found in the first two columns of the periodic table, which include the alkali metals (Group 1) and alkaline earth metals (Group 2). This unit covers the distinctive properties, reactivity, and uses of these elements. Students will explore the electronic configuration of s-block elements, their physical and chemical properties, and their role in various chemical reactions and applications.

Key Topics in S-Block Elements:

• Alkali Metals: Examining the characteristics of alkali metals (Li, Na, K, Rb, Cs, Fr), including their high reactivity, softness, and unique reactions with water.
• Alkaline Earth Metals: Understanding the properties of alkaline earth metals (Be, Mg, Ca, Sr, Ba, Ra), such as their reactivity, density, and use in various compounds.
• Electronic Configuration: Analyzing the electron arrangement in s-block elements and how it affects their chemical behavior.
• Reactivity and Compounds: Exploring the reactivity of s-block elements with other substances and the formation of their typical compounds, including oxides, halides, and hydroxides.
• Applications: Learning about the practical uses of s-block elements in industries, medicine, and daily life.

Benefits of Studying S-Block Elements:

• Foundational Knowledge: Provides essential insights into the chemistry of some of the most reactive and widely used elements.
• Practical Applications: Enhances understanding of the practical uses of s-block elements in various fields, including manufacturing and healthcare.
• Academic Preparation: Builds a strong foundation for advanced study in Chemistry and related sciences.

This unit is crucial for understanding the basic properties and applications of s-block elements, offering foundational knowledge that supports further learning in Chemistry.

1. Which one of the following does not belong to alkaline earth metals?

a. Be
b. Ra
c. Ba
d. Rn

2. The oxide of beryllium is:

a. Acidic
b. Basic
c. Amphoteric
d. None of these

3. Which ion will have the maximum value of heat of hydration?

a. Na⁺
b. Cs²⁺
c. Ba²⁺
d. Mg²⁺

4. Which one of the following is not an alkali metal?

a. Francium
b. Cesium
c. Rubidium
d. Radium

5. Which of the following sulphates is not soluble in water?

a. Sodium sulphate
b. Potassium sulphate
c. Zinc sulphate
d. Barium sulphate

6. The element cesium bears resemblance with

a. Ca
b. Cr
c. Both of these metals
d. None of these metals

7. Chile saltpeter has the chemical formula

a. NaNO₃
b. KNO₂
c. Na₂B₄O₇
d. Na₂CO₃.H₂O

8. The mineral (CaSO₄.2H₂O) has the general name:

a. Gypsum
b. Dolomite
c. Calcite
d. Epsom salt

9. Down’s cell is used to prepare

a. Sodium carbonate
b. Sodium bicarbonate
c. Sodium metal
d. Sodium hydroxide

10. Which element is deposited at cathode during the electrolysis of brine in diaphragm cell?

a. H₂
b. Na
c. Cl₂
d. O₂