Identify the correct statements from the following. (i) The number of hydrogen bonded water molecules in…

Identify the correct statements from the following. (i) The number of hydrogen bonded water molecules in copper sulphate pentahydrate is one. (ii) Lanthanum and zirconium form non-stoichiometric hydrides. (iii) In solid form of $\mathrm{H}_2 \mathrm{O}$, each oxygen is surrounded by six oxygen in octahedral positions at a distance of $276 \mathrm{pm}$.
  1. i, ii, iii
  2. i, ii
  3. ii, iii
  4. i, iii

Solution

Both (i) and (ii) statements are correct. The number of hydrogen bonded water molecules in copper sulphate pentahydrate is one
Water of crystallisation $\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right] \mathrm{SO}_4 \cdot \mathrm{H}_2 \mathrm{O}$ lanthanum and zirconium form non-stoichiometric hydrides. Some hydrides are $\mathrm{LaH}_2, \mathrm{LaH}_3, \mathrm{ZrH}_2$. All hydrides are non-stoichiometric with variable composition, e.g. $\mathrm{ZrH}_x(1.30 \leq x \leq 1.75)$. Most of these hydrides are good conductors of electricity in solid state. In solid form of $\mathrm{H}_2 \mathrm{O}$, each oxygen atom is bonded to four hydrogen atoms, two by hydrogen atoms and two by normal covalent bonds in a near tetrahedral configuration.

Asked in: AP EAMCET 2018 (24 Apr Shift 1)

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