p-Block Elements · JEE Main previous year questions

2012 4 questions

1. Q852012 · 26 May 2012 · Shift 1

   Which one of the following depletes ozone layer?

   1. A.$\mathrm{CO}$
   2. B.$\mathrm{NO}$ and freons
   3. C.$\mathrm{S}{\mathrm{O}}_2$
   4. D.$\mathrm{C}{\mathrm{O}}_2$
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   Answer: B

2. Q842012 · 12 May 2012 · Shift 1

   A metal $M$ on heating in nitrogen gas gives $Y$. $Y$ on treatment with ${\mathrm{H}}_2\mathrm{O}$ gives a colourless gas which when passed through $\mathrm{CuS}{\mathrm{O}}_4$ solution gives a blue colour. $Y$ is

   1. A.$\mathrm{N}{\mathrm{H}}_3$
   2. B.$\mathrm{Mg}(\mathrm{N}{\mathrm{O}}_3{)}_2$
   3. C.$\mathrm{M}{\mathrm{g}}_3{\mathrm{N}}_2$
   4. D.$\mathrm{MgO}$
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   Answer: C

3. Q622012 · 7 May 2012 · Shift 1

   The ratio of number of oxygen atoms (O) in 16.0 g ozone (${\mathrm{O}}_3$), 28.0 g carbon monoxide (CO) and 16.0 g oxygen (${\mathrm{O}}_2$) is (Atomic mass : C = 12, O = 16 and Avogadro's constant ${\mathrm{N}}_{\mathrm{A}}=6.0\times 10^{23}\mathrm{mo}{\mathrm{l}}^{-1}$)

   1. A.3 : 1 : 2
   2. B.1 : 1 : 2
   3. C.3 : 1 : 1
   4. D.1 : 1 : 1
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   Answer: D

4. Q692012 · 7 May 2012 · Shift 1

   Copper wire test for halogens is known as

   1. A.Dumas' Test
   2. B.Beilstein's Test
   3. C.Liebig's Test
   4. D.Lassaigne's Test
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   Answer: B