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Describe the theory associated with the radius of an atom as it.
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The first $(\Delta_{1}\text{H}_{1})$ and the second $(\Delta_{1}\text{H}_{1})$ ionization enthalpies (in $\mathrm{kJ} \mathrm{~mol}^{-1}$ ) and the $(\Delta_{1}\text{H}_{1})$ electron gain enthalpy (in $\mathrm{kJ} \mathrm{~mol}^{-1}$ ) of a few elements are given below:
Which of the above elements is likely to be:
The most reactive metal.
→| Elements | $\Delta\text{H}_{1}$ | $\Delta{\text{H}}_{2}$ | $\Delta_{\text{eg}}\text{H}$ |
| I | 520 | 7300 | -60 |
| II | 419 | 3051 | -48 |
| III | 1681 | 3374 | -328 |
| IV | 1008 | 1846 | -295 |
| V | 2372 | 5251 | +48 |
| VI | 738 | 1451 | -40 |
The most reactive metal.
Nitric acid acts only as an oxidising agent while nitrous acid acts both as an oxidising as well as reducing agent. Explain.
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Diamond is covalent, yet it has high melting point.
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Atomic radius of gallium (135 pm) is less than that of aluminium (143 pm).
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Graphite is a good conductor of electricity but diamond is insulator.
30 gm KCl is dissolved in 300 gm water and a solution is obtained. Calculate mass $\%$ of solution.
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Nickel(II) sulphate.
What is the mass percent of carbon in carbon dioxide?
Calculate the velocity of a particle of mass 0.1 mg which is associated with a wavelength of $3.3 \times 10^{-29} \mathrm{~m}\left(\mathrm{~h}=6.6 \times 10^{-34} \mathrm{~kg} / \mathrm{m}^2 \mathrm{~s}^{-1}\right)$.
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