Work functions of four metals $M_1, M_2, M_3$ and $M_4$ are $4.8,4.3,4.75$ and 3.75 eV respectively. The metals which do not show photoelectric effect when light of wavelength 310 nm falls on the metals are
In second period of the modern periodic table, two elements $X$ and $Y$ have higher first ionisation enthalpy values than the preceding and succeeding elements. $X$ and $Y$ are respectively
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
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