Q10 / 160 · TS EAMCET 2023 (13 May Shift 1) · Chemistry

Identify the correct statements about the hydrides. (I) In saline hydrides oxidation state of hydrogen is +1 (II) $\mathrm{La} \mathrm{H}$ is an example of interstitial hydride (III) $\mathrm{NH}_3, \mathrm{H}_2 \mathrm{O}$ have the tendency to form hydrogen bonds (IV)Electrolysis of molten sodium hydride liberates $\mathrm{H}_2$ gas at cathode $\Rightarrow \mathrm{K}_{\mathrm{c}}=\frac{(0.5)(0.5)}{(0.5)(0.5)}=1.0$

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

Solution

Statement (I) is incorrect because saline or ionic hydrides have the hydrogen atom in -1 oxidation state. Statement (IV) is incorrect because at cathode, reduction of $\mathrm{Na}^{+}$to $\mathrm{Na}$ takes place while hydrogen gas is liberated at the anode.

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

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