Q10 / 160 · TS EAMCET 2023 (12 May Shift 1) · Chemistry

Consider the following statements about the hydrides (I) Sodium hydride with water liberates oxygen gas (II) Methane, silane are examples of electron precise hydrides (III) Ammonia and water molecules are examples of electron deficient hydrides (IV)Hydrides of beryllium and magnesium are polymeric in structure The correct statements are

  • A
    I & II only
  • B
    III & IV only
  • Correct answer
    C
    II & IV only
  • D
    I & IV only

Solution

Statement (I) is incorrect as the reaction between $\mathrm{NaH}$ and $\mathrm{H}_2 \mathrm{O}$ gives sodium hydroxide and hydrogen gas. $\mathrm{NaH}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{H}_2 \uparrow$ Statement (III) is incorrect as $\mathrm{NH}_3$ and $\mathrm{H}_2 \mathrm{O}$ are electronprecise molecules with a set of eight electrons around the central atom.

Hence, the correct answer is option: 'C'.

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