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Chemistry : The s-Block Elements

Short Answer Type

161.

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

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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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169.

How would you explain that BeO is insoluble but BeSO₄ is soluble in water?

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170.

How would you explain that BaO is insoluble but BeSO₄ is soluble in water?

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