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161.
Alkaline earth metals are less electropositive than the alkali metals. Explain.

Alkaline earth metals are less electropositive because of the smaller size and higher ionisation enthalpies of alkaline earth metals as compared to alkali metals.

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162.

Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?

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163.

How will you explain the reducing character of alkaline earth metals?

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164.

Comment on each of the following observations:
$straight E to the power of circled dash space for space straight M to the power of 2 plus end exponent left parenthesis aq right parenthesis space plus 2 straight e to the power of minus space space rightwards arrow space space straight M left parenthesis straight s right parenthesis.$
(where M = Ca, Sr or Ba) is nearly constant.

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165.

Explain why alkaline earth metals are poor reducing agents as compared to alkali metals.

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Long Answer Type

166.

Explain the trend of solubility of carbonate, sulphates and hydroxides of alkaline earth metals ?

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Short Answer Type

167.

Account for the following:
(i) Be(OH)₂ is amphoteric while Mg(OH)₂is basic.

(ii) Be(OH)₂ is insoluble but Ba(OH)₂ is fairly soluble in water.

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168. The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain ?

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