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Syllabus

(a) 2 : 1

(b) 1 : 4

(c) 2 : 3

(d) 3 : 4

Kindly explain the above question and its answer

A 28.A capillary of radius r is lowered into a wetting agent with surface tension a and density d.(i) The height h

_{0}_{ }to witch the liquid will rise in the capillary is - (A) $\left[\frac{2a}{dgr}\right]$ (B) $\left[\frac{4a}{dgr}\right]$ (C) $\left[\frac{8a}{dgr}\right]$ (D) $\left[\frac{a}{8dgr}\right]$

(ii) The work done by surface tension is -

(A) $\left[\frac{2{\mathrm{\pi a}}^{2}}{dg}\right]$ (B) $\left[\frac{4{\mathrm{\pi a}}^{2}}{dg}\right]\left(C\right)\left[\frac{8{\mathrm{\pi a}}^{2}}{dg}\right]$ (D) $\left[\frac{12{\mathrm{\pi a}}^{2}}{dg}\right]$

(iii) The potential energy acquired by the liquid in the capillary is equal to -

(A) $\left[\frac{4{\mathrm{\pi a}}^{2}}{dg}\right]$ (B) $\left[\frac{6{\mathrm{\pi a}}^{2}}{dg}\right]$ $\left(C\right)\left[\frac{2{\mathrm{\pi a}}^{2}}{dg}\right]\left(\mathrm{D}\right)\left[\frac{7{\mathrm{\pi a}}^{2}}{dg}\right]$

Among H2, He, CH4 and O2, the gas which can be easily liquefied is

1)K(He)=K(Ar)

2)K(He)>K(Ar)

3)K(He)=1/2K(Ar)

Q5. An orange solid (X) on heating, gives a colourless gas (Y) and a only green residue (Z). Gas (Y) on treatment Mg, produces a white solid substance.....

(A) Mg

_{3}N_{2}(B) MgO (C) Mg_{2}O_{3}(D) MgCl_{2}$\left(A\right)\frac{1}{2}\sqrt{3}\times {10}^{-20}{m}^{2}\phantom{\rule{0ex}{0ex}}\left(B\right)4\sqrt{3}\times {10}^{-20}{m}^{2}\phantom{\rule{0ex}{0ex}}\left(C\right)2\sqrt{3}\times {10}^{-20}{m}^{2}\phantom{\rule{0ex}{0ex}}\left(D\right)8\sqrt{3}\times {10}^{-20}{m}^{2}\phantom{\rule{0ex}{0ex}}$