25 Questions MCQ Test Science Class 10 - NTSE Level Test: Metals & Non-metals
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Nonmetals tend to form anions. With one, two, or three valence electrons metals tend to lose electrons to achieve a noble gas configuration. (It would require more energy to gain the 5 – 7 electrons needed to fill their valence shell.)
Explanation: The least conductor of heat among the given options is lead. Here's why: Conductivity of Heat: Conductivity of heat refers to the ability of a material to conduct heat. Materials with high thermal conductivity allow heat to flow through them easily, while materials with low thermal conductivity resist the flow of heat. Comparing the Options: Let's compare the given options to determine the least conductor of heat: - Gold: Gold is known for its high thermal conductivity, making it an excellent conductor of heat. - Platinum: Platinum also has a high thermal conductivity, similar to gold. - Silver: Silver is one of the best conductors of heat, even better than gold and platinum. - Lead: Lead has a relatively low thermal conductivity compared to the other options. It is a poor conductor of heat. Conclusion: Based on the comparison, we can conclude that the least conductor of heat among the given options is lead (option D). It has a lower thermal conductivity compared to gold, platinum, and silver.
Metals have 1-3 electrons in their outermost orbit. They are present on the extreme left of the periodic table. They tend to donate electrons and obtain the stable electronic configuration of the nearest noble gas. The valency on metals also ranges from 1-3 .
Answer: The metalloid elements are those that have properties of both metals and nonmetals. They are located along the zigzag line on the periodic table. Among the options given, the metalloid element is: A: Si (Silicon) - Silicon is a metalloid element. - It is a solid at room temperature. - It has a shiny luster like metals. - It is a good conductor of electricity like metals. - However, it is brittle and semiconductor in nature like nonmetals. - It is commonly used in the production of computer chips and solar cells. B: Sb (Antimony) - Antimony is not a metalloid element. - It is a metallic element. - It is a solid at room temperature. - It has a metallic luster and is a good conductor of electricity. D: Zn (Zinc) - Zinc is not a metalloid element. - It is a metallic element. - It is a solid at room temperature. - It has a metallic luster and is a good conductor of electricity. Therefore, the correct answer is C: A and B (Si and Sb) as both Silicon and Antimony are metalloid elements.
China Clay is also known as kaolin & white clay. Primary clay formed by natural kaolinisation process. it is formed by decomposition of some part of feldspar mineral.White in color , Used in ceramic slip casting process, Pressing processes and forming process as a body former and filler.
An alloy is a mixture of metals or a mixture of a metal and another element. Explanation: - An alloy is formed when two or more metals are mixed together. It can also be a mixture of a metal and another element. - Alloys are created to improve the properties of the original metals, such as strength, durability, and resistance to corrosion. - Common examples of alloys include bronze (copper and tin), steel (iron and carbon), and brass (copper and zinc). - Alloys can have a wide range of compositions and properties, depending on the specific metals or elements involved. - The different metals in an alloy are typically evenly distributed throughout the mixture, resulting in a homogeneous material. - Alloys can be created through various methods, including melting and mixing the metals together, or by depositing one metal onto another through processes like electroplating. - The properties of an alloy can be different from those of its constituent metals, making it a distinct material with unique characteristics. - Alloys are widely used in various industries, including construction, automotive, aerospace, and electronics, due to their desirable properties and versatility.
Key Points: - The non-metal that is the best conductor of electricity is graphite. - Graphite is a form of carbon that has a unique structure allowing it to conduct electricity. - This is due to the presence of delocalized electrons in its structure. - Delocalized electrons are free to move throughout the material, allowing for the flow of electric current. - Graphite is commonly used as an electrode material in batteries and fuel cells. - It is also used in electrical contacts, such as in switches and relays. - Other non-metals, such as phosphorus, fluorine, and bromine, are not good conductors of electricity. - Phosphorus is a poor conductor because it is a non-metal and does not have delocalized electrons. - Fluorine is a non-metal with a very high electronegativity, making it highly reactive and unlikely to conduct electricity. - Bromine, although it is a liquid at room temperature, is also a poor conductor of electricity due to its non-metallic properties.
Sodium bicarbonate, also commonly known as baking soda, is commonly seen as a white, fine powder and has the chemical formula NaHCO3. It has one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms. It is a very useful chemical that is alkaline in nature.
Sodium is stored under kerosene because of its high chemical reactivity with almost all of other elements (for example oxygen from air which oxidizes it instantly). Kerosene and mineral oil are the only chemicals that make the sodium inert.
The magnesium is used in Flash bulb, Grignard reagent, Electron - alloy. When magnesium burns, it makes very bright white light. Elektron is an alloy containing magnesium (90%) , zinc, aluminum (9%) and other other Metals (1%) .
The most malleable metal is Gold (Au).It must be surprising as most of us have never come across gold foils or gold leaf that often in our lives unlike aluminium,iron,copper foils.One reason for this must be because of the cost of this noble metal,gold.
Cinnabar is a toxic mercury sulfide mineral with a chemical composition of HgS. It is the only important ore of mercury. It has a bright red color that has caused people to use it as a pigment, and carve it into jewelry and ornaments for thousands of years in many parts of the world. Because it is toxic, its pigment and jewelry uses have almost been discontinued.
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