Other Chemistry · JEE Main previous year questions

2004 14 questions

1. Q1482004 · 24 Apr 2004 · Shift 1

   To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid (${\mathrm{H}}_3\mathrm{P}{\mathrm{O}}_3$), the volume of 0.1 M aqueous KOH solution required is

   1. A.40 mL
   2. B.20 mL
   3. C.10 mL
   4. D.60 mL
   Show answer

   Answer: A

2. Q1602004 · 24 Apr 2004 · Shift 1

   Which one of the following has the regular tetrahedral structure? (Atomic nos : B = 5, S = 16, Ni = 28, Xe = 54)

   1. A.$\mathrm{Xe}{\mathrm{F}}_4$
   2. B.$[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$
   3. C.$\mathrm{B}{\mathrm{F}}_4^{-}$
   4. D.$\mathrm{S}{\mathrm{F}}_4$
   Show answer

   Answer: C

3. Q1612004 · 24 Apr 2004 · Shift 1

   The maximum number of 90° angles between bond pair of electrons is observed in

   1. A.$\mathrm{ds}{\mathrm{p}}^3$ hybridization
   2. B.$\mathrm{s}{\mathrm{p}}^3{\mathrm{d}}^2$ hybridization
   3. C.$\mathrm{ds}{\mathrm{p}}^2$ hybridization
   4. D.$\mathrm{s}{\mathrm{p}}^3\mathrm{d}$ hybridization
   Show answer

   Answer: B

4. Q1662004 · 24 Apr 2004 · Shift 1

   For the reaction, $\mathrm{CO}(\mathrm{g})+\mathrm{C}{\mathrm{l}}_2(\mathrm{g})\leftrightharpoons \mathrm{COC}{\mathrm{l}}_2(\mathrm{g})$ the $\frac{K_p}{K_c}$ is equal to :

   1. A.$\sqrt{RT}$
   2. B.RT
   3. C.1/RT
   4. D.1.0
   Show answer

   Answer: C

5. Q1782004 · 24 Apr 2004 · Shift 1

   Which one of the following statements is false?

   1. A.Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction
   2. B.Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression
   3. C.The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is $\mathrm{BaC}{\mathrm{l}}_2$ > KCl > $\mathrm{C}{\mathrm{H}}_3\mathrm{COOH}$ > sucrose
   4. D.The osmotic pressure ($\pi$) = MRT, where M is the molarity of the solution
   Show answer

   Answer: B

6. Q1862004 · 24 Apr 2004 · Shift 1

   The rate equation for the reaction $2A+\mathrm{B}\to \mathrm{C}$ is found to be: rate = k[A][B]. The correct statement in relation to this reaction is that the

   1. A.unit of k must be ${\mathrm{s}}^{-1}$
   2. B.value of k is independent of the initial concentration of A and B
   3. C.rate of formation of C is twice the rate of disappearance of A
   4. D.$t_{1/2}$ is a constant
   Show answer

   Answer: B

7. Q1872004 · 24 Apr 2004 · Shift 1

   Consider the following nuclear reactions ${}_{92}^{238}M\to {}_Y^{X}N+2{}_2^{4}He$ ${}_Y^{X}N\to {}_B^{A}L+2{\beta }^{+}$ The number of neutrons in the element L is

   1. A.140
   2. B.144
   3. C.142
   4. D.146
   Show answer

   Answer: B

8. Q1882004 · 24 Apr 2004 · Shift 1

   The half – life of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is

   1. A.1.042 g
   2. B.4.167 g
   3. C.3.125 g
   4. D.2.084 g
   Show answer

   Answer: C

9. Q1892004 · 24 Apr 2004 · Shift 1

   Which one the following statement regarding helium is incorrect?

   1. A.It is used to fill gas balloons instead of hydrogen because it is lighter and non–inflammable
   2. B.It is used in gas – cooled nuclear reactors
   3. C.It is used to produce and sustain powerful superconducting reagents
   4. D.It is used as cryogenic agent for carrying out experiments at low temperatures
   Show answer

   Answer: A

10. Q1912004 · 24 Apr 2004 · Shift 1

    Excess of KI reacts with $\mathrm{CuS}{\mathrm{O}}_4$ solution and then $\mathrm{N}{\mathrm{a}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ solution is added to it. Which of the statements is incorrect for this reaction?

    1. A.$\mathrm{C}{\mathrm{u}}_2{\mathrm{I}}_2$ is formed
    2. B.Evolved ${\mathrm{I}}_2$ is reduced
    3. C.$\mathrm{N}{\mathrm{a}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ is oxidized
    4. D.$\mathrm{Cu}{\mathrm{I}}_2$ is formed
    Show answer

    Answer: D

11. Q2012004 · 24 Apr 2004 · Shift 1

    Acetyl bromide reacts with excess of $\mathrm{C}{\mathrm{H}}_3\mathrm{MgI}$ followed by treatment with a saturated solution of $\mathrm{N}{\mathrm{H}}_4\mathrm{Cl}$ given

    1. A.acetone
    2. B.acetyl iodide
    3. C.2- methyl -2- propanol
    4. D.acetamide
    Show answer

    Answer: C

12. Q2072004 · 24 Apr 2004 · Shift 1
    
    1. A.
    2. B.
    3. C.
    4. D.
    Show answer

    Answer: D

13. Q2112004 · 24 Apr 2004 · Shift 1

    Among the following compounds which can be dehydrated very easily is

    1. A.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}(\mathrm{C}{\mathrm{H}}_3)(\mathrm{OH})\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$
    2. B.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{CH}(\mathrm{OH})\mathrm{C}{\mathrm{H}}_3$
    3. C.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{OH}$
    4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{CH}(\mathrm{C}{\mathrm{H}}_3)\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{OH}$
    Show answer

    Answer: A

14. Q2132004 · 24 Apr 2004 · Shift 1

    As the temperature is raised from 20°C to 40°C, the average kinetic energy of neon atoms changes by a factor of which of the following?

    1. A.1/2
    2. B.2
    3. C.$\frac{313}{293}$
    4. D.$\sqrt{\frac{313}{293}}$
    Show answer

    Answer: C