Other Chemistry · JEE Main previous year questions

2006 9 questions

1. Q1022006 · 29 Apr 2006 · Shift 1

   Which of the following molecules/ions does not contain unpaired electrons?

   1. A.${\mathrm{O}}_2^{2-}$
   2. B.${\mathrm{B}}_2$
   3. C.$N_2^{+}$
   4. D.${\mathrm{O}}_2$
   Show answer

   Answer: A

2. Q1032006 · 29 Apr 2006 · Shift 1

   In which of the following molecules/ions are all the bonds not equal?

   1. A.$\mathrm{Xe}{\mathrm{F}}_4$
   2. B.$B{F}_4^{-}$
   3. C.$\mathrm{S}{\mathrm{F}}_4$
   4. D.$\mathrm{Si}{\mathrm{F}}_4$
   Show answer

   Answer: C

3. Q1152006 · 29 Apr 2006 · Shift 1

   Among the following mixtures, dipole-dipole as the major interaction, is present in

   1. A.benzene and ethanol
   2. B.acetonitrile and acetone
   3. C.KCl and water
   4. D.benzene and carbon tetrachloride
   Show answer

   Answer: B

4. Q1172006 · 29 Apr 2006 · Shift 1

   Which of the following chemical reactions depicts the oxidizing behaviour of ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$?

   1. A.$\mathrm{NaCl}+{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4\to \mathrm{NaHS}{\mathrm{O}}_4+\mathrm{HCl}$
   2. B.$2PC{\mathrm{l}}_5+{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4\to 2POC{\mathrm{l}}_3+2HCl+\mathrm{S}{\mathrm{O}}_2\mathrm{C}{\mathrm{l}}_2$
   3. C.$2HI+{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4\to {\mathrm{I}}_2+\mathrm{S}{\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}$
   4. D.$\mathrm{Ca}(\mathrm{OH}{)}_2+{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4\to \mathrm{CaS}{\mathrm{O}}_4+2{\mathrm{H}}_2\mathrm{O}$
   Show answer

   Answer: C

5. Q1182006 · 29 Apr 2006 · Shift 1

   The molar conductivities ${\wedge }_{NaOAc}^{\circ }$ and ${\wedge }_{HCl}^{\circ }$ and at infinite dilution in water at $25^{\circ }\mathrm{C}$ are 91.0 and $426.2\mathrm{Sc}{\mathrm{m}}^2/mol$ respectively. To calculate ${\wedge }_{HOAc}^{\circ }$, the additional value required is

   1. A.${\wedge }_{H_{2}O}^{\circ }$
   2. B.${\wedge }_{KCl}^{\circ }$
   3. C.${\wedge }_{NaOH}^{\circ }$
   4. D.${\wedge }_{NaCl}^{\circ }$
   Show answer

   Answer: D

6. Q1242006 · 29 Apr 2006 · Shift 1

   Which of the following statements is true?

   1. A.${\mathrm{H}}_3\mathrm{P}{\mathrm{O}}_3$ is a stronger acid than ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_3$
   2. B.In aqueous medium HF is a stronger acid than HCl
   3. C.$\mathrm{HCl}{\mathrm{O}}_4$ is a weaker acid than $\mathrm{HCl}{\mathrm{O}}_3$
   4. D.$\mathrm{HN}{\mathrm{O}}_3$ is a stronger acid than $\mathrm{HN}{\mathrm{O}}_2$
   Show answer

   Answer: D

7. Q1302006 · 29 Apr 2006 · Shift 1

   In $\mathrm{Fe}(\mathrm{CO}{)}_5$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses :

   1. A.$\pi$-character only
   2. B.both $\sigma$ and $\pi$ characters
   3. C.ionic character
   4. D.$\sigma$-character
   Show answer

   Answer: B

8. Q1352006 · 29 Apr 2006 · Shift 1

   HBr reacts with $\mathrm{C}{\mathrm{H}}_2=\mathrm{CH}-\mathrm{OC}{\mathrm{H}}_3$ under anhydrous conditions at room temperature to give

   1. A.$\mathrm{C}{\mathrm{H}}_3\mathrm{CHO}$ and $\mathrm{C}{\mathrm{H}}_3\mathrm{Br}$
   2. B.$\mathrm{BrC}{\mathrm{H}}_2\mathrm{CHO}$ and $\mathrm{C}{\mathrm{H}}_3\mathrm{OH}$
   3. C.$\mathrm{BrC}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{OC}{\mathrm{H}}_3$
   4. D.${\mathrm{H}}_3\mathrm{C}-\mathrm{CHBr}-\mathrm{OC}{\mathrm{H}}_3$
   Show answer

   Answer: D

9. Q1362006 · 29 Apr 2006 · Shift 1

   The increasing order of the rate of HCN addition to compounds A – D is (A) HCHO (B) $\mathrm{C}{\mathrm{H}}_3\mathrm{COC}{\mathrm{H}}_3$ (C) $\mathrm{PhCOC}{\mathrm{H}}_3$ (D) PhCOPh

   1. A.$\mathrm{A}<\mathrm{B}<\mathrm{C}<\mathrm{D}$
   2. B.$\mathrm{D}<\mathrm{B}<\mathrm{C}<\mathrm{A}$
   3. C.$\mathrm{D}<\mathrm{C}<\mathrm{B}<\mathrm{A}$
   4. D.$\mathrm{C}<\mathrm{D}<\mathrm{B}<\mathrm{A}$
   Show answer

   Answer: C