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Alkali Metals Halides - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main
Quick Facts
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Halides of Alkali Metals is considered one of the most asked concept.
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15 Questions around this concept.
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Identify the correct statements about alkali metals.
Identify the correct statements about alkali metals.
A. The order of standard reduction potential $\left(\mathrm{M}^{+} \mid \mathrm{M}\right)_{\text {for alkali metal ions }}$ $N a>R b>L i$.
B. CsI is highly soluble in water.
C. Lithium carbonate is highly stable to heat.
D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.
E. All the alkali metal hydrides are ionic solids.
Choose the correct answer from the options given below :
Concepts Covered - 0
Halides of Alkali Metals
Alkali metals react with halogens to form metal halides, which are ionic in nature.
The reactivity order of alkali metals towards halogens is:
Ionic nature, solubility in H2O increases while lattice energy decreases.
For example:
These halides are colourless, however, on heating, they become coloured due to nonstoichiometry and crystal defects.
NOTE:
- LiF is ionic but insoluble in H2O due to very high lattice energy while LiCl, LiBr, LiI are covalent and hence are less soluble or insoluble as their hydration energy is less than lattice energy.
- Other MX are crystalline solids with high melting and boiling points.
- Halides of K, Rb, Cs can also form polyhalides. For example:
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