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The entry of electron in degenerate Orbitals (equivalent energy ex; 3-p Orbitals) takes place in such a way that before pairing each orbital is filled with one electron

Answer

When copper sulphate pentahydrate is heated it looses the water molecules (dehydration) takes place which results in the loss of Blue colour of Copper sulphate.

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Hydrogen shows similarities & differences with alkali metals as well as Halogens. * Electronic configuration is similar with alkali metals. * Valence is similar with alkali metals. * Hydrogen exhibits two oxidation states I.e; +1 & -1. *Like Alkali metals it exhibits +1 state and like Halogens it exhibits -1 state. * Ionization energy of Hydrogen is high which is similar to Halogens and dissimilar to Alkali metals.

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Acetylene has two acidic hydrogens this is because in acetylene two carbons bonded by a triple bond. Three electron pairs exactly in middle of two carbon atoms. Being more electronegative Carbon try to gain the electron pair which is shared between hydrogen and carbon by the dissociation of bond which results the elimination of proton.