NEET TEST SERIES 105 CHEMISTRY

Name

1. The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, k = Ae−^Ea/RT. Activation energy (E_a) of the reaction can be calculated by plotting

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2. At 25⁰C, the dissociation constant of a base, BOH is 0×10⁻¹². The concentration of hydroxyl ions in 0.01M aqueous solution of the base would be:

a) 1.0×10⁶mol L⁻¹
b) 1.0×10⁻⁷mol L⁻¹
c) 2.0×10⁻⁶ mol L⁻¹
d) 1.0×10⁻⁵ mol L⁻¹

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3. One mole of an ideal mono-atomic gas is caused to go through the cycle shown in the figure below. Then the change in the internal energy in expanding the gas from ato c along the path abc is:

a) 3P₀V₀ b) 6 RT₀
c) 4.5 RT₀
d) 10.5 RT₀

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4. A reaction occurs spontaneously if:

a) TΔS =ΔH and both ΔH and ΔS are positive
b) TΔS >ΔH and both ΔH and ΔS are positive
c) TΔS >ΔH and both ΔH and ΔS are positive
d) TΔS >ΔH and both ΔH and ΔH is positive and ΔS is negative

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5. A schematic plot of ln K_eqversus inverse of temperature for a reaction is shown below: The reaction must be:

a) Highly spontaneous at ordinary temperature
b) One with negligible enthalpy change
c) endothermic
d) exothermic

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6. If the mass of neutron is assumed to half of its original value whereas that of proton is assumed to be twice of its original value, then the atomic mass of ¹⁴C will be

a) Same
b) 14.28 % less
c) 14.28 % more
d) 28.56 % more

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7. The △G⁰for the reaction = + 57 kJ
MX_(s)⇔M⁺_(aq)+ X⁻_(aq)Hence K_sp for the reaction is

a) 10⁻⁵
b) 10⁻⁶c) 10⁻¹⁰
d) 10⁻¹⁶

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8. For the observations given, the correct rate law expression is:

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9. Cu⁺((aq))is unstable in solution and undergoes simultaneous oxidation and reduction, according to the reaction 2Cu⁺(aq) ⇌ Cu²⁺(aq) + Cu(s)
Choose E⁰ for the above reaction if

a) − 0.38 V
b) + 0.49 V
c) + 0.38 V
d) + 0.19 V

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10. Which of the following statement is false?

a) Raoult’s law is obeyed only when solution is very dilute
b) Both Raoult’s law and Henry’s law law says that P α X
c) Increase in temperature decreases solubility of solid in liquid for endothermic reaction
d) Increase in temperature increases solubility of solid in liquid for endothermic reaction

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11. On reductive ozonolysis of

yields

a) 6-oxoheptanoic acid
b) 6-oxoheptanal
c) 6-hydroxyheptanal
d) 3-hydroxypentanal

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a) CH₃CHO
b) CH₃CH₂NHOH
c) CH₃CH₂COOH
d) CH₃COOHDeselect Answer

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the product E is
a) salicylic acid
b) anthranilic acid
c) benzoic acid
d) o-nitrobenzoic acid.Deselect Answer

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14. Which gives iodoform test?

a) Hexan-3-one
b) Pentan-3-one
c) Pentan-2-one
d) PentanalDeselect Answer

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15. Which one is most reactive towards nucleophilic addition reaction?

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a) mesityl oxide
b) 2-butene
c) 2-Hydroxybutanal
d) 3-hydroxybutanalDeselect Answer

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17. An organic aromatic compound having molecular formula C₂H₂O does not give characteristic colour with neutral FeCl3 but bubbles of hydrogen gas are formed when it is treated with metallic sodium. The compound is

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18. Tertiary butyl halide on boiling with water gives tertiary butyl alcohol. The reaction follows

a) 2 mechanism
b) N1 mechanism
c) E1 mechanism
d) none of theseDeselect Answer

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19. The products obtained when anisole is heated in a sealed tube with HI are

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a) phenol
b) Benzyl alcohol
c) Aniline
d) BenzaldehydeDeselect Answer

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