For which element [IP_2 -IP_1 < 11 , eV] is found

[At $45^{\circ} \mathrm{C}$ vapour pressure of benzene is $280\, \mathrm{~mm} \,\mathrm{Hg}$ and that of octane is $420\, \mathrm{~mm} \,\mathrm{Hg}$. Assume Ideal gas]

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$Cu ( s )+ Sn ^{2+}(0.001 M ) \rightarrow Cu ^{2+}(0.01 M )+ Sn ( s )$

The Gibbs free energy change for the above reaction at $298\, K$ is $x \times 10^{-1} \,k\,J\, mol ^{-1}$;

The value of $x$ is ..... [nearest integer]$\left [\text { Given : } E _{ Cu ^{2} / / Cu }=0.34\, V ; E _{ Sn ^{2} / Sn }^{\ominus}=-0.14 \,V ; F=96500\, C\, mol ^{-1}\right]$

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The number of unpaired electrons in Gadolinium $[Z = 64]$ is

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In the mixture of conc. ${H_2}S{O_4}$ and $HN{O_3}$the nitrating species is

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The rate of first order reaction is $0.04 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ at $10$ minutes and $0.03 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ at $20$ minutes after initiation. Half life of the reaction is ____________minutes. (Given $\log 2=0.3010, \log 3=0.4771)$

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Which of the following acid possesses oxidising, reducing and complex forming properties

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A $20\, litre$ container at $400\, K$ contains $CO_{2(g)}$ at pressure $0.4\, atm$ and an excess of $SrO$ (neglect the volume of solid $SrO$). The volume of the container is now decreased by movingthe movable piston fitted in the container. The maximum volume of the container, when pressure of $CO_2$ attains its maximum value, will be........$litre$

(Given that : $SrCO_{3(s)} \rightleftharpoons SrO_{(s)}+ CO_{2(g)} \,, K_p=1.6\,atm$)

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