Q. 1
In an isobaric process
  • a. Temperature remains constant
  • b. Supplied heat energy remains constant
  • c. Pressure remains constant
  • d. Volume remains constant
  • e. Enthalpy remains constant
  • Answer: C

  • Explaination: Explanation: In an isobaric process, the pressure remains constant. Temperature remains constant in an isothermal process. In an isochoric process, volume remains constant. Enthalpy remains constant in an isoenthalpic process.
Q. 2
The oxidation number of nitrogen in NO-2 is
  • a. +4
  • b. +3
  • c. +2
  • d. +1
  • e. -4
  • Answer: B

  • Explaination: Explanation: Oxygen atom in nitrate ion has the oxidation number of -2. Nitrate ion also has a charge -1. Thus the oxidation number of nitrogen in the nitrate ion can be calculated using the formula.
    X+ 2(2) = -1
    Therefore, X = +3
Q. 3
Which of the following statements is TRUE for an E1 reaction?
  • a. E1 reaction requires a strong base to take place
  • b. Primary and secondary alkyl halides are good substrate for the E1 reaction.
  • c. E1 reactions occur during the solvolysis of tertiary alkyl halide
  • d. The rate of E1 vs SN1 reaction increases at lower temperature
  • e. None of these
  • Answer: C

  • Explaination: Explanation: E1 reaction does not require base to take place. E1 reaction does not occur in primary alkyl halide. The reaction occurs during the solvolysis of tertiary alkyl halide.
Q. 4
Predict the X in the following reaction
test8-q4-img1
  • a. X is an alpha particle
  • b. X is a beta particle
  • c. X is a gamma ray
  • d. X is a positron
  • e. None of the above
  • Answer: C

  • Explaination: Explanation: In the above reaction, technetium is in excited state. It is converted to the ground state by the emission of a gamma ray without change in the atomic number as well as in the mass number. Emission of an alpha particle or beta particle or positron will bring a change in atomic number or in the mass number. But the gamma ray emission will not bring any change in the atomic number or in the mass number.
Q. 5
The solution contains 10.0 mmol of acetic acid and its pKa is 4.75. How many millimoles of sodium acetate are required to produce a buffer solution of pH 5.7?
  • a. 3.31 mmol
  • b. 33.1 mmol
  • c. 23.1 mmol
  • d. 35.1 mmol
  • e. 31.1 mmol
  • Answer: B

  • Explaination: Explanation: Given data: pH = 5.7, pKa = 4.75, Molar concentration of acetic acid is 10.0 mmol.
    pH = pKa+ log ([A-] / [HA])
    5.7 = 4.75 + log (x / 10)
    log (x / 10) = 0.52
    x/10 = 3.313
    x = 33.1 mmol.
Q. 6
A galvanic cell converts
  • a. Electrical energy to chemical energy
  • b. Chemical energy to thermal energy
  • c. Chemical energy to electrical energy
  • d. Kinetic to potential energy
  • e. None of these
  • Answer: C

  • Explaination: Explanation: A galvanic cell converts chemical energy to electrical energy. Its redox reaction is spontaneous and responsible for the production of electrical energy. Electrolytic energy converts electrical energy to chemical energy, its redox reaction is non-spontaneous so, electrical energy has to be supplied to initiate the reaction.
Q. 7
How many mL of 4M NaOH should be needed to neutralize 20 mL of 8M HCl?
  • a. 20 mL
  • b. 60 mL
  • c. 15 mL
  • d. 40 mL
  • e. None of the above
  • Answer: D

  • Explaination: Explanation: For the neutralization reaction MaVa = MbVb
    Ma = acid molarity, Va = acid volume
    Mb = base molarity, Vb = base volume
    20 mL ?? 8 M = x mL ?? 4M
    x = 40 mL
Q. 8
Which of the following conditions is suitable for an alkaline solution?
  • a. [H+] > [OH-]
  • b. [H+] = [OH-]
  • c. [H+]
  • d.
  • e.
  • Answer: A

Score: 0/8