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Alkali metals are usually stored in hydr...

Alkali metals are usually stored in hydrocarbon solvents to protect them from air and moisture but lithium cannot . Why ?

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**Step-by-Step Solution:** 1. **Understanding Alkali Metals Storage**: Alkali metals are highly reactive and can easily react with air (oxygen) and moisture (water). To prevent these reactions, they are typically stored in hydrocarbon solvents like kerosene. 2. **Identifying Lithium's Unique Property**: Among the alkali metals, lithium has a very low density compared to other alkali metals. This property affects how it interacts with hydrocarbon solvents. 3. **Behavior of Lithium in Hydrocarbon Solvents**: Due to its low density, lithium tends to float on the surface of hydrocarbon solvents such as kerosene. This floating behavior makes it ineffective for storage because it is not submerged in the solvent, leaving it exposed to air and moisture. ...
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Both alkali metals and alkaline earth metals are s- block elements. They resemble each other in many respects but still there are certain dissimilarities in their properties due to different number of electrons in the valence shell, different atomic radii, ionisation enthalpy, electronegativity, etc. Like lithium, Be also differs from rest of the alkaline earth metals on account of its small atomic size and high electronetativity. Be^(2+) ion is very small and exerts a high polarising effect on any anion associated with it. The correct sequence of increasing covalent character is

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Solar pond is a device for collecting solar heat. The pond is about one metre deep, filled with saturated salt solution and protected from air current and other disturbances. When exposed to sun, the temperature at the bottom can go as high as 80^(@)C or more. why is this possible?

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PRADEEP-S-BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) -Assertion -Reason Type Question (Type 2)
  1. Alkali metals are usually stored in hydrocarbon solvents to protect th...

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  2. Assertion (A): Alkali metals impart colour to the flame. Reason (R )...

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  3. Assertion (A): Sodium reacts with oxygen to form Na(2)O(2) whereas pot...

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  4. Assertion . K , Rb and Cs form superoxides . Reason . The stability ...

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  5. Statement I LiCl is predomionantly a covalent compound. Statement II...

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  6. Assertion (A): The mobility of Na^(o+) is lower than that of K^(o+) io...

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  7. Assertion . Among the alkali metals , lithium salts exhibit the least ...

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  8. Assertion . Li resembles Mg. Reason . Li^(+) has approximately the s...

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  9. Assertion (A): Na(2)CO(3) and Li(2)CO(3) are thermally stable. Reaso...

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  10. Assertion . Potassium carbonate cannot be manufactured by a process s...

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  11. Assertion (A): In rainy season, common salt becomes damp after sometim...

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  12. Assertion . In the electrolysis of aqueous NaCl , Na is preferentially...

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  13. Assertion (A): magnesium keeps on burning in CO(2). Reason (R ): Mag...

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  14. Assertion (A): Calcium and magnesium oxides are not reduced by carbon....

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  15. Assertion . CaF(2) has been given the name fluorspar . Reason. Soli...

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  16. Assertion (A): Na(2)SO(4) is soluble in water while BaSO(4) is insolub...

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  17. Assertion (A): Sulphur is estimates as BaSO(4) and not as MgSO(4). R...

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  18. Assertion Bleaching powder is a mixed salt. Reason In the presence o...

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  19. Assertion (A): Magnesium can be obtained by the electronlysis of aqueo...

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  20. Assertion (A): magnesium is not present in enamel of human teeth. Re...

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