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        <div id="content-top1">Page 15 - index</div>
        <div id="content-top2">P. 15</div>
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    <pre style="white-space:pre-line"><code>2. s-Block Elements                                         eLearn.Punjab

           Mg(s) + H2 (g)   ï£§ï£§ï£§â†’Pr essure  MgH2 (g)
                                 (MgI2 )

similarly            Ca(s) + H2 (g) ï£§ï£§â†’ CaH2 (g)

3. All Group II-A elements react with nitrogen on heating giving nitrides.
For example, magnesium reacts with nitrogen to give magnesium nitride.

           3Mg(s) + N2 (g)  ï£§ï£§â†’ Mg3N2 (g)

                            Magnesium nitride

The nitrides hydrolyse vigorously when treated with
water, giving ammonia and the respective hydroxides.

           Mg3N2 (s) + 6H2O(ï¬) ï£§ï£§â†’ 2NH3 (g) + 3Mg(OH)2 (s)

4. With sulphur, magnesium gives magnesium sulphide, MgS. The other
Group II-A metals also react similarly.

                     Mg + S ï£§ï£§â†’ MgS

                                Magnesium sulphide

5. All     group     II-A elements react directly           with
halogens   giving    halides of the type MX2                 e.g.

                     Ca(s) + Cl2 (g) ï£§ï£§â†’ CaCl2 (g)

                            15</code></pre>
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