Thermochemistry MCQ

Test your knowledge with important Thermochemistry MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Thermochemistry MCQs at Bissoy

• In an experiment, salt of Sodium Carbonate (Na₂CO₃) is dissolved in Water (H₂O), then NaOH and a carbonic acid is formed. This experment is an example of
  ক

  electrolysis

  খ

  hydrolysis

  গ

  ionisation

  ঘ

  dissociation
• The conduction of electricity through the electrolyte solution is due to
  ক

  the movement of molecule of electrolyte

  খ

  the movement of ions of electrolyte

  গ

  the movement of separate atom

  ঘ

  the movement of particles of the solvent
• In an electrochemical cell that functions as a voltaic cell
  ক

  electrons move from the cathode to the anode

  খ

  electrons move through a salt bridge

  গ

  electrons can move either from the cathode to the anode or from the anode to the cathode

  ঘ

  reduction occurs at the cathode
• Which of the following statements about the commonly used automobile battery are true?<br>1. It is usually a lead-acid battery.<br>2. It has six cells with a potential of 2V each.<br>3. Its cells work as galvanic cells while discharging power.<br>4. It cells work as electrolytic cells while recharging.<br>Select the correct answer:
  ক

  1, 2, 3 and 4

  খ

  1, 2 and 3

  গ

  2 and 4

  ঘ

  3 and 4
• Consider the following statements.<br>The electrochemical series helps<br>1. in extraction of metals.<br>2. in protecting themetal fromcorrosion.<br>3. in comparing the reactivity of metals.<br>Which of the above is/are true?
  ক

  Only 1

  খ

  Only 2

  গ

  2 and 3

  ঘ

  1, 2 and 3
• To protect iron against corrosion, the durable metal plating on it, is
  ক

  tin plating

  খ

  copper plating

  গ

  zinc plating

  ঘ

  nickel plating
• When an acid cell is charged, then
  ক

  voltage of cell increases

  খ

  resistance of cell increases

  গ

  electrolyte of cell dilutes

  ঘ

  None of the above
• The depolarisation in a primary cells is used for the purpose of
  ক

  increasing the life of the cell

  খ

  increasing the emf of the cell

  গ

  removing the hydrogen collected at one of the plates

  ঘ

  removing the dipoles from the electrolytes
• Which of the following reaction is an example of exothermic reaction?
  ক

  Burning of natural gas

  খ

  Respiration

  গ

  The decomposition of vegetable matter into compost

  ঘ

  All options are correct
• A smuggler could not carry gold by depositing iron on the gold surface, because
  ক

  gold has lower standard reduction potential than iron

  খ

  gold has higher standard reduction potential than iron

  গ

  iron rusts

  ঘ

  gold in denser
• If a refrigerator's door is kept open, then
  ক

  room will be cooled

  খ

  room will be heated

  গ

  room may get cooled or heated depending upon the weather

  ঘ

  no effect
• Aluminium surfaces are of ten 'anodised'. This means the deposition of a layer of
  ক

  chromium oxide

  খ

  aluminium oxide

  গ

  nickel oxide

  ঘ

  zinc oxide
• Galvanised iron sheets are protected fromrusting due to presence of a layer of
  ক

  lead

  খ

  chromium

  গ

  zinc

  ঘ

  tin
• Which one among the following metals is more reactive than hydrogen?
  ক

  Mercury

  খ

  Copper

  গ

  Silver

  ঘ

  Tin
• A conductivity cell is platinised
  ক

  to prolong its service

  খ

  to avoid temperature effect

  গ

  to avoid polarisation effect

  ঘ

  None of the above
• During the evaporation of a liquid
  ক

  the enthalpy decreases

  খ

  the enthalpy increases

  গ

  the internal energy decreases

  ঘ

  the enthalpy remains unchanged
• Among the following respiration is which type of process?
  ক

  Exothermic process

  খ

  Endothermic process

  গ

  Both exothermic and endothermic

  ঘ

  Neither exothermic nor endothermic
• Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers etc?
  ক

  Nickel and cadmium

  খ

  Zinc and carbon

  গ

  Lead peroxide and lead

  ঘ

  Iron and cadmium
• When ammonium chloride is dissolved in water, the solution becomes cold. The change is
  ক

  endothermic

  খ

  exothermic

  গ

  super cooling

  ঘ

  None of these
• The source of electrical energy on the Apollo Moon flights was
  ক

  a generator set

  খ

  H₂ - O₂ fuel cell

  গ

  Ni-Cd cell

  ঘ

  lead storage batteries
• With reference to 'fuel cells' in which hydrogen rich fuel and oxygen are used to generate electricity. Consider the following statements.<br>1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by products.<br>2. Fuel cells can be used for powering buildings and not for small devices like laptop, computers.<br>3. Fuel cells produce electricity in the form of Alternating Current (AC).<br>Which of the statements given above is/are correct?
  ক

  Only 1

  খ

  2 and 3

  গ

  1 and 3

  ঘ

  1, 2 and 3
• The passage of an electric current through a conducting liquid causes . . . . . . . .
  ক

  galvanisation

  খ

  evaporation

  গ

  physical reaction

  ঘ

  chemical reaction
• During isothermal expansion of an ideal gas, its
  ক

  enthalpy reduces to zero

  খ

  enthalpy decreases

  গ

  internal energy increases

  ঘ

  enthalpy remains unaffected
• In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
  ক

  generate heat

  খ

  create potential difference between the two electrodes

  গ

  produce high purity water

  ঘ

  remove absorbed oxygen from electrode surfaces
• Assertion (A) Copper metal with HCl liberates hydrogen.<br>Reason (R) Hydrogen is present above Cu in the reactivity series.
  ক

  Both A and R are true and R is the correct explanation of A

  খ

  Both A and R are true, but R is not the correct explanation of A

  গ

  A is true, but R is false

  ঘ

  A is false, but R is true
• Anode mud is a
  ক

  mixture of impure metals like Fe

  খ

  SO₂ gas

  গ

  mixture of Ag, Au and Pt

  ঘ

  None of the above
• The internal resistance of a dry cell is
  ক

  equal to that of electrolytic cell

  খ

  smaller than that of electrolytic cell

  গ

  higher than that of electrolytic cell

  ঘ

  zero
• Corrosion is basically an
  ক

  interaction

  খ

  union between two light metals and a heavy metal

  গ

  altered reaction in presence of H₂O

  ঘ

  electrochemical phenomenon
• Entropy change of a system and its surroundings in equilibrium
  ক

  increases

  খ

  decreases

  গ

  remains constant

  ঘ

  either increases or decreases
• When two plates of different metals are placed in an electrolyte, the developed emf between them depends on
  ক

  the type of electrolyte

  খ

  distance between the plates

  গ

  position of the two metals in the electrochemical series

  ঘ

  All of the above