Consider the following pairs of elements and identify the pairs of elements which have nearly same atomic radius.
I. Y, La
II. Zr, Hf
III. Mo, W
IV. Cr, Mo
If the sum of bond orders of $\mathrm{O}_2^{-}$and $\mathrm{O}_2^{2-}$ is $x$, then bond order of $\mathrm{O}_2^{2+}$ will be
Identify the molecule / ion in which the ratio of $\sigma$ to $\pi$-bonds is $3: 2$
At 298 K , a flask ' $A$ ' of unknown volume $(V)$ contains oxygen at 5 atm . Another flask ' $B$ ' of volume 2 L contains helium at 3 atm . Two flasks are connected together by a small tube of zero volume. After the two gases are completely mixed, if the resulting mixture is found to have the mole fraction of oxygen as 0.2 , the volume of flask ' $A$ ' (in L ) is
(Assume oxygen and helium as ideal gases)
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