Hydrogen & s-Block · JEE Main previous year questions

2002 2 questions

1. Q2122002 · 27 Apr 2002 · Shift 1

   $\mathrm{K}{\mathrm{O}}_2$ (potassium super oxide) is used in oxygen cylinders in space and submarines because it :

   1. A.absorbs $\mathrm{C}{\mathrm{O}}_2$ and increases ${\mathrm{O}}_2$ content
   2. B.eliminates moisture
   3. C.absorbs $\mathrm{C}{\mathrm{O}}_2$
   4. D.produces ozone
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   Answer: A

2. Q2132002 · 27 Apr 2002 · Shift 1

   The metallic sodium disolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to formation of :

   1. A.solvated electron, $\mathrm{e}(\mathrm{N}{\mathrm{H}}_3{)}_{\mathrm{x}}^{-}$
   2. B.solvated atomic sodium, $\mathrm{Na}(\mathrm{N}{\mathrm{H}}_3{)}_{\mathrm{y}}$
   3. C.$(\mathrm{N}{\mathrm{a}}^{+}+\mathrm{N}{\mathrm{a}}^{-})$
   4. D.$\mathrm{NaN}{\mathrm{H}}_2+{\mathrm{H}}_2$
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   Answer: A