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171.
How would you explain that BaO is insoluble but BeSO₄ is soluble in water?

BaO and BaSO₄ are ionic compounds. Further the size of O^2– ion is much smaller as compared to that of SO₄^2– ion. Also, a bigger anion stabilises a bigger cation more than a smaller anion stabilises a bigger cation. As a result lattice enthalpy of BaO is much less than that of BaSO₄ and hence BaO is insoluble in water while BaSO₄ is soluble

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172. Explain why halides of beryllium fume in moist air but other alkaline earth metal halides do not.

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Long Answer Type

173.

What is meant by the diagonal relationship of elements? Discuss the diagonal relationship of beryllium with aluminium.

Or

Beryllium exhibits some similarities with aluminium. Point out three such properties.

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174.

Discuss the diagonal realtionship of Be and Al with regard to:
(i) action of alkali (ii) structure of chlorides.

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Short Answer Type

175.

Give any three points of similarities between beryllium and aluminium and two points of dissimilarities between beryllium and barium ?

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176.

How beryllium chloride is prepared? Give its two important properties

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177.

Name the gases in which magnesium wire continues to burn and write the reactions ?

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Long Answer Type

178.

Draw the structure of: (i) BeCl₂ (vapour) (ii) BeCl₂ (solid).

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179.

How does magnesium occur in nature? How is magnesium obtained by electrolysis method ?

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180.

What happens when:
(i) magnesium is heated with water.
(ii) magnesium is heated in an atmosphere of carbon dioxide,
(iii) magnesium is treated with dilute sulphuric acid and
(iv) magnesium is treated with nitrogen?

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