p-Block Elements · JEE Main previous year questions

2019 7 questions

1. Q802019 · 10 Apr 2019 · Shift 1

   The oxoacid of sulphur that does not contain bond between sulphur atoms is

   1. A.${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$
   2. B.${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_3$
   3. C.${\mathrm{H}}_2{\mathrm{S}}_4{\mathrm{O}}_6$
   4. D.${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_4$
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   Answer: A

2. Q632019 · 10 Apr 2019 · Shift 2

   The noble gas that does not occur in the atmosphere is :

   1. A.Ne
   2. B.He
   3. C.Kr
   4. D.Rn
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   Answer: D

3. Q862019 · 10 Apr 2019 · Shift 2

   The number of pentagons in ${\mathrm{C}}_{60}$ and trigons (triangles) in white phosphorus, respectively, are :

   1. A.12 and 3
   2. B.20 and 3
   3. C.20 and 4
   4. D.12 and 4
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   Answer: D

4. Q862019 · 9 Apr 2019 · Shift 1

   ${\mathrm{C}}_{60}$ an allotrope of carbon contains :

   1. A.12 hexagons and 20 pentagons.
   2. B.20 hexagons and 12 pentagons.
   3. C.16 hexagons and 16 pentagons
   4. D.18 hexagons and 14 pentagons.
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   Answer: B

5. Q662019 · 9 Apr 2019 · Shift 2

   The correct statements among I to III regarding group 13 element oxides are, (I) Boron trioxide is acidic. (II) Oxides of aluminium and gallium are amphoteric. (III) Oxides of indium and thallium are basic.

   1. A.(II) and (III) only
   2. B.(I), (II) and (III)
   3. C.(I) and (III) only
   4. D.(I) and (II) only
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   Answer: B

6. Q812019 · 9 Apr 2019 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: B

7. Q842019 · 12 Jan 2019 · Shift 2

   The upper stratosphere consisting of the ozone layer protects us from sun's radiation that falls in the wavelength region of -

   1. A.200-315 nm
   2. B.400-550 nm
   3. C.0.8-1.5 nm
   4. D.600-750 nm
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   Answer: A