The order in which the following oxides ...

The order in which the following oxides are arranged according to decreasing basic nature is

`Na_(2)O,MgO,Al_(2)O_(3),CuO`

`CuO,Al_(2)O_(3),MgO,Na_(2)O`

`Al_(2)O_(3),CuP,MgO,Na_(2)O`

`CuO,MgO,Na_(2)O_(3)

Text Solution

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The correct Answer is:

Applying Fajans' rule,the lower the charge,the more is ionic and the more is basic and vice versa.Moreover,small cation,large anion,high charge and presence of d electrons mean more covalant and more acidic. Therefore,decreasing order of basic nature is `{:(,+1,,+2,,+3,,+2),(,Na_(2)O, gt , MgO, gt,Al_(2)O_(3),gt,CuO),("Group-",1,,2,,13,,11),("Period-",3rd,,3rd,,3rd,,4th):} `

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`CaO lt MgO lt lt SrO lt BaO lt BeO`

`BaO ltSrO lt CaO lt MgO lt BeO`

`BeO lt MgO lt CaO lt BaO lt SrO`

`BeO lt MgO lt CaO lt SrO lt BaO`

Which of the following is arranged in order of decreasing melting point?

`S gt P gt Si gt Al`

`Al gt Si gt P gt S`

`Si gt Al gt S gt Al`

`P gt S Al gt Si`

Which of the following is arranged in decreasing order of size?

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`O^(2-) gt Mg^(2+) gt Al^(3+)`

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`Al^(3+) gt O^(2-) gt Mg^(2+)`