Let's match the elements with their uses: A. Li (Lithium): Lithium is a highly reactive alkali metal widely used in batteries, particularly rechargeable lithium-ion batteries that power portable electronic devices, electric vehicles, etc. This matches characteristic 2. (A-2) B. Na (Sodium): Sodium ions (Na+) are essential electrolytes in the body. They play a critical role in regulating blood pressure and the control of water balance in the blood and body tissues through osmosis. This matches characteristic
Match List I with List II and select the correct answer using the code given below the Lists: List I List II (Ele‐ (Use) ment)
Asked in UPSC NDA 2 2015 · Topic: Metals, Minerals, Ores: Properties, Uses (Uses of common metals and their compounds in industries and daily life)
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Answer: C. K 3. Transfer of nerve impulses 4. Control of the water content in the
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- (B-4) C. K (Potassium): Potassium ions (K+) are also essential electrolytes involved in various bodily functions, including the transmission of nerve impulses and muscle contractions (along with sodium ions). This matches characteristic 3. (C-3) D. Cs (Cesium): Cesium is an alkali metal, and the isotope Cesium-133 is famously used in atomic clocks due to the highly stable frequency of radiation emitted during electron transitions in its atom, which defines the length of a second. This matches characteristic 1. (D-1) Thus, the correct matching is A-2, B-4, C-3, D-1, which corresponds to option C (2 4 3 1). 142. Batteries used in mobile and smart phones are:
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