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Shweta Thakur posted an Question
July 13, 2020 • 22:59 pm
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30 points
30 points
- IIT JAM
- Chemistry (CY)
Plz explain thecovelent character of hydrides of alkali metal
plz explain thecovelent character of hydrides of alkali metal
3 Answer(s)
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Priyanshu kumar
https://www.toppr.com/guides/chemistry/hydrogen/hydrides/ for all hydrides questions and concepts
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Dinesh khalmaniya 1
hope this will help you 🙏🙏
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Dinesh khalmaniya 1
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it is reverse of ionic characters Explanation: As the size of the metal cation increases down the group, the lattice energy of the hydrides decreases down the group. Consequently, the reactivity of the alkali towards hydrogen decreases down the group. iii. The ionic character of the alkali metal hydrides increases from Li to Cs. Explanation: Since ionisation enthalpy of alkali metals decreases down the group, tendency to form cations as well as the ionic character of the hydrides increases. so covalent characters decrease
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The covalent character of the alkali metal hydrides decrease from Li to Cs.
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LiH > NaH> KH > RbH > CsH
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got it??
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yes sir plz explain solubility again
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so what is your doubt because it's related to fajan's rule. so if you wanna understand which factors affecting solubility please check fajan's rule
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also solubility related to ioni6or covalent characters
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I've sent to fajan's rule image in previous query please check it
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Priyanshu kumar
Greater the polarizing power of cation or polarizability of an anion, greater are the percentage of covalent characters produced in an ionic compound. Covalent characters in ionic compound depends upon following factors. 1:-Smaller the size of cation, greater is its polarising power,thus greater will be the covalent nature of the bond. 2:-Larger the size of anion, greater is its polarizability thus greater will be the covalent nature of the bond . 3:-As the charge on ion increases, the electrostatic attraction of the cation for the outer electrons of the onion also increases, with the result its ability for forming the covalent bond increases. 4:-For the two ions of the same size and charge,one with pseudo noble gas configuration will be more polarizing than a cation with noble gas configuration. read little bit revision about fajans rule
yes sir this I know...I am only confused on solubility....
yes now your confusion gets clear na😊
no sir
ask??
which is more soluble lih or nah
in water
shweta always keep in mind about like dissolve like pattern...means polarity same solubility same...and you know covalent character is inversely proportional to solubility...and Lih is more covalent than nah
always we are talking about ionic solubility...and comparing covalent solubility with respect to this
covelent compounds are weak
ionic compound are stronger than covalent due to coulombic interactions
we are conparing this things with respect to some thing not individually
sir covalent compound are non polar that's why they donot dissolve in water
because water is polar
yes like dissolve like...and covalent compounds are more soluble in oil and fats
sir
but nah is not a covelent compond
i am telling you previously na this is comparable thing
we are comparing with respect to something
ok
sir
fine
👍😊