Question

Give reason for each of the following: [3]
A. i. Noble gases do not combine with other elements to form molecules.
ii. Metals form positive ions.
iii. Anhydrous calcium chloride turns into a colourless solution when exposed to air.

Answer 1

Answer:

1)Noble gases do not combine with other elements to form molecules. Ans : Because noble gases are stable .. their Valence shell have 8 electrons expect helium (He). They are following octet rule ...so, they do not combine..

Explanation:

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Answer 2

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1) The full valence electron shells of these atoms make noble gases extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons.

2) Metals form positive ions because metals are very electropositive, and their outer electrons are very loosely bunded on them. so, that they lose electrons and gain a positive charge and hence from positive ions.

3) As calcium carbide is a deliquescent substance it absorb water from the atmosphere when exposed to air. If anhydrous calcium chloride is exposed in the air it will also water from the atmosphere and turns into a colourless solution.

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