Under isothermal conditions two soap bubbles of radii a and b coalesce to form a single bubble of radius c. If external pressure is P0, the surface tension is equal to :

For&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>Na</mi><mo>+</mo></msup><mo>,</mo><mo>&nbsp;</mo><msup><mi>Mg</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>,</mo><mo>&nbsp;</mo><msup><mi mathvariant="normal">F</mi><mo>-</mo></msup></math>&nbsp;and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi mathvariant="normal">O</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup></math>; the correct order of increasing ionic radii is&nbsp;&nbsp;

Radius of Cs+ ion is less than that ofA) Fluoride ion&nbsp;B) Chloride ionC) Bromide ion

(A) : The ionic radii follow the order I– &gt; I &gt; I+&nbsp; (R) : I, I– and I+ are not isoelectronic species.

Regarding lanthanide contraction, some statements are given&nbsp;(A) It arises because of the poor shielding effect of 5f-electrons(B) The atomic radii and ionic radii steadily decrease from Ce to Lu&nbsp;(C)&nbsp; The crystal structures and other properties are similar&nbsp;&nbsp;(D) The seperation of lanthanides from one another is difficult from their salt solutions.&nbsp;The correct statements are

Zeff for last electron of 4S sub shell electron of &nbsp;Zn atom (Z = 30) is

Under isothermal conditions two soap bubbles of radii a and b coalesce to form a single bubble of radius c. If external pressure is P₀, the surface tension is equal to :

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