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NEET Exam > Chemistry Class 11 > Flashcard: s-block Elements
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129 videos|238 docs|88 tests
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FAQs on Flashcard: s-block Elements Video Lecture - Chemistry Class 11 - NEET
| 1. What are s-block elements? |  |
Ans. S-block elements refer to the elements in the periodic table belonging to groups 1 and 2, which include the alkali metals and alkaline earth metals, respectively. These elements are placed in the s-block because they have their outermost electron(s) in the s orbital.
| 2. Why are s-block elements important? | |
Ans. S-block elements have significant importance in various aspects. Alkali metals (group 1) are highly reactive and commonly used in chemical reactions, such as the formation of salts and water reactions. Alkaline earth metals (group 2) are essential for many biological processes, including muscle function and nerve transmission. Additionally, s-block elements play a vital role in industrial applications, such as metal extraction and alloy production.
| 3. What are the general characteristics of s-block elements? | |
Ans. S-block elements share some common characteristics. They have low ionization energies, making them prone to losing electrons and forming positive ions. These elements are typically soft, have low melting and boiling points, and exhibit metallic properties. Alkali metals are known for their high reactivity and tendency to form ionic compounds, while alkaline earth metals have slightly lower reactivity compared to alkali metals.
| 4. How do s-block elements react with water? | |
Ans. Alkali metals (group 1) react vigorously with water, producing hydrogen gas and metal hydroxides. For example, sodium reacts with water to form sodium hydroxide and hydrogen gas. Alkaline earth metals (group 2) also react with water, but their reactivity is lower compared to alkali metals. They form metal hydroxides and release hydrogen gas, similar to alkali metals.
| 5. Are all s-block elements found naturally? | |
Ans. Yes, all s-block elements are found naturally. Alkali metals and alkaline earth metals are abundant in the Earth's crust and are commonly found in minerals. For example, sodium is present in table salt (sodium chloride), and calcium is found in limestone and gypsum. However, some alkali metals, such as francium, are extremely rare and radioactive, making them difficult to find in significant quantities.
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