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(a). Mention the most abundant and least...

(a). Mention the most abundant and least abudant alkaline earth
metal in the earth's crust.
b. Arrange alkaline earth metals in order of decreasing hydration enthalpy.
c. `Ca, Sr` and `Ba` generally form ionic compounds. why?
d. Mention colours of `Ca,Ba` and `Sr` in flame test.

Text Solution

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(a). Amongst the alkaline earth metals, the most abundant is calcium and the least abundant is radium in the earth's crust.
(b). Five imortant properties of alkaline earth metals which increas from `Be` to `Ba` are:
i. size,
ii. Metallic property,
iii. reducing nature,
vi. tendency to form peroxide,
v. reactiveity
c. Hydration enthalpy: `Be^(2+)gtMg^(2+)gtCa^(2+) gt Sr^(2+)gtBa^(2+)`
d. `Ca,Sr` and `Ba` generally form ionic compounds due to their low ionisation enthalpy. e. `{:("Elements",Ca,Sr,Ba),(Flame,Brick,Crimson,"Apple"),(colour,red,red,green):}`
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