JEE Exam > JEE Videos > Chemistry for JEE Main & Advanced > Alkali Metal Trends (Part- 1)
Alkali Metal Trends (Part- 1) Video Lecture | Chemistry for JEE Main & Advanced
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FAQs on Alkali Metal Trends (Part- 1) Video Lecture - Chemistry for JEE Main & Advanced
| 1. What are alkali metals? |  |
Ans. Alkali metals are a group of chemical elements that belong to Group 1 of the periodic table. These elements include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). They are highly reactive metals and are known for their low melting points and softness.
| 2. What are the trends in the physical properties of alkali metals? | |
Ans. Alkali metals exhibit certain trends in their physical properties as we move down the group. These trends include increasing atomic size, decreasing ionization energy, decreasing electronegativity, and decreasing melting and boiling points. Additionally, the reactivity of alkali metals increases as we move down the group.
| 3. Why do alkali metals have low melting and boiling points? | |
Ans. Alkali metals have low melting and boiling points due to the presence of weak metallic bonds between their atoms. These weak metallic bonds are formed by the delocalized electrons, which are not tightly held by the positive metal ions. As a result, it takes less energy to overcome these weak bonds and convert the solid metal into a liquid or a gas.
| 4. How do alkali metals react with water? | |
Ans. Alkali metals react vigorously with water, releasing hydrogen gas and forming metal hydroxides. The reaction becomes more vigorous as we move down the group. For example, lithium reacts slowly with water, while sodium reacts more violently and potassium reacts explosively. This reaction is highly exothermic and can lead to the formation of alkaline solutions.
| 5. What is the significance of alkali metals in everyday life? | |
Ans. Alkali metals have several significant applications in everyday life. For example, sodium is used in the production of soap, while potassium is an essential nutrient for plants and is commonly found in fertilizers. Lithium is used in batteries, and rubidium and cesium have applications in atomic clocks and GPS systems. Overall, alkali metals play a crucial role in various industries and technological advancements.
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Nov 21, 2024 Last updated |
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