p-Block Elements · JEE Main previous year questions

2018 6 questions

1. Q852018 · 16 Apr 2018 · Shift 1

   Among the oxides of nitrogen : ${\mathrm{N}}_2{\mathrm{O}}_3$, ${\mathrm{N}}_2{\mathrm{O}}_4$ and ${\mathrm{N}}_2{\mathrm{O}}_5$; the molecule(s) having nitrogen-nitrogen bond is / are :

   1. A.Only ${\mathrm{N}}_2{\mathrm{O}}_5$
   2. B.${\mathrm{N}}_2{\mathrm{O}}_3$ and ${\mathrm{N}}_2{\mathrm{O}}_5$
   3. C.${\mathrm{N}}_2{\mathrm{O}}_4$ and ${\mathrm{N}}_2{\mathrm{O}}_5$
   4. D.${\mathrm{N}}_2{\mathrm{O}}_3$ and ${\mathrm{N}}_2{\mathrm{O}}_4$
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   Answer: D

2. Q612018 · 15 Apr 2018 · Shift 1

   A sample of $NaCl{O}_3$ is converted by heat to $NaCl$ with a loss of $0.16g$ of oxygen. The residue is dissolved in water and precipitated as $AgCl$. The mass of $AgCl$ (in $g$) obtained will be : (Given : Molar mass of $AgCl=143.5gmo{l}^{-1}$)

   1. A.0.35
   2. B.0.41
   3. C.0.48
   4. D.0.54
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   Answer: C

3. Q822018 · 15 Apr 2018 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: D

4. Q722018 · 8 Apr 2018 · Shift 1

   How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane? (Atomic weight of B = 10.8 u)

   1. A.1.6 hours
   2. B.6.4 hours
   3. C.0.8 hours
   4. D.3.2 hours
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   Answer: D

5. Q742018 · 8 Apr 2018 · Shift 1

   The compound that does not produce nitrogen gas by the thermal decomposition is :

   1. A.$({\text{NH}}_4{)}_2{\text{SO}}_4$
   2. B.$\text{Ba}({\text{N}}_3{)}_2$
   3. C.$({\text{NH}}_4{)}_2{\text{Cr}}_2{\text{O}}_7$
   4. D.${\text{NH}}_4{\text{NO}}_2$
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   Answer: A

6. Q772018 · 8 Apr 2018 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: C