p-Block Elements · JEE Main previous year questions

2017 2 questions

1. Q842017 · 9 Apr 2017 · Shift 1

   At 300 K, the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen (${\mathrm{N}}_2$ ) at 4 bar. The molar mass of gaseous molecule is :

   1. A.$28\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$
   2. B.$56\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$
   3. C.$112\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$
   4. D.$224\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$
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   Answer: C

2. Q742017 · 8 Apr 2017 · Shift 1

   A metal ‘M’ reacts with nitrogen gas to afford ‘${\mathrm{M}}_3\mathrm{N}$’. ‘${\mathrm{M}}_3\mathrm{N}$’ on heating at high temperature gives back ‘M’ and on reaction with water produces a gas ‘B’. Gas ‘B’ reacts with aqueous solution of $\mathrm{CuS}{\mathrm{O}}_4$ to form a deep blue compound. ‘M’ and ‘B’ respectively are :

   1. A.$\mathrm{Li}$ and $\mathrm{N}{\mathrm{H}}_3$
   2. B.$\mathrm{Ba}$ and ${\mathrm{N}}_2$
   3. C.$\mathrm{Na}$ and $\mathrm{N}{\mathrm{H}}_3$
   4. D.$\mathrm{Al}$ and ${\mathrm{N}}_2$
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   Answer: A