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Q: The oxidation state of carbon in Na₂C₂: (ETEA 2015)

A) +4

B) +2

C) -1

D) -4

Q: The cathode in lead storage battery is made of: (ETEA 2015)

A) Lead

B) Lead oxide

C) Lead hydroxide

D) None

Q: What is the oxidation state of copper in Cs₂CuFe? (ETEA 2015)

A) +7

B) +2

C) +3

D) +4

Q: Choose the true statement regarding the reaction 2Na + Cl₂ → 2NaCl: (ETEA 2015)

A) Chlorine is oxidized and sodium is reduced

B) Chlorine acts as oxidizing agent and sodium acts as reducing agent

C) Chlorine acts as reducing agent and sodium acts as oxidizing agent

D) Both chlorine and sodium act as oxidizing agent

Q: Balance the given equation FeS₂ + O₂ → Fe₂O₃ + SO₂ using suitable coefficients: (ETEA 2016)

A) 4:11:2:8

B) 1:10:2:8

C) 6:5:3:7

D) 2:17:4:8

Q: A cell is constructed of the following two half-cells. What is E of the cell? Ag⁺ +e⁻→ Ag+0.80V (reduction), Al³⁺ + 3e⁻ → Al -1.67V (reduction) (ETEA 2016)

A) 2.47V

B) 0.087V

C) -0.87V

D) 5.81

Q: In which of the following reactions hydrogen acts as oxidizing agent? (ETEA 2016)

A) H₂ + Cl₂ → 2HCl

B) C₂H₄ + H₂ → C₂H₆

C) 2Na + H₂ → 2NaH

D) N₂ + 3H₂ → 2NH₃

Q: Which is strong electrolyte? (ETEA 2016)

A) Ca(OH)₂

B) SiCl₄

C) KCl

D) SrCl₂

Q: Consider the reaction 3Ag + HNO₃ → 3AgNO₃ + NO + H₂O. Select the true statement: (ETEA 2017)

A) Silver is reduced

B) NO⁻₃ is oxidized to NO

C) Silver gains electrons

D) Nitrogen accepts electron

Q: Choose the incorrect statement about corrosion: (ETEA 2017)

A) Corrosion cannot be eliminated completely

B) Employing modern techniques corrosion can be completely eliminated

C) Corrosion process can be slowed down by certain methods

D) The presence of acidic oxide in the environment can accelerate the process of corrosion

Q: Choose the wrong statement: (ETEA 2017)

A) Operating life for fuel cell is unlimited

B) Electrode in fuel cell may be porous solid and may contain catalyst

C) The fuel in fuel cell can be gas, liquid, solid or solution

D) In fuel cell the cell products cannot be regenerated

Q: Food article spoiling involves oxidation-reduction processes; preservatives act as: (ETEA 2017)

A) An oxidizing agent

B) A reducing agent

C) An acid

D) A base

Q: Calculate E°cell from the half-cell reactions: Zn²⁺ + 2e → Zn (E°=-0.76V), Cu²⁺ + 2e → Cu (E°=+0.34V) (ETEA 2017)

A) 1.10V

B) 1.20V

C) 1.0V

D) 1.40V

Q: Students calculated the cell voltage for the reaction Br₂ + 2NaCl → 2NaBr + Cl₂. The answer was negative, it means that: (ETEA 2018)

A) The reaction is non-spontaneous and feasible

B) The reaction is non-spontaneous and not feasible

C) The reaction is spontaneous and feasible

D) The reaction is spontaneous and not feasible

Q: The oxidizing and reducing agents respectively in the reaction H₂S + 2FeCl₂ → 2FeCl₃ + 2HCl + S: (ETEA 2018)

A) S²⁻, Fe³⁺

B) Fe²⁺, S²⁻

C) Fe³⁺,S²⁻

D) S²⁻,Cl⁻

Q: The reducing agent in the reaction KMnO₄ + KI + H₂SO₄ → MnSO₄ + K₂SO₄ + I₂ + H₂O: (ETEA 2018)

A) KMnO₄

B) KI

C) H₂SO₄

D) KI and H₂SO₄ both

Q: The aqueous solution of which of the following electrolyte will conduct electric current to large extent? (ETEA 2018)

A) Mg(OH)₂

B) H₂CO₃

C) NH₄Cl

D) NH₄OH

Q: Chrome plating is related to: (ETEA 2018)

A) Daniel cell

B) Voltaic cell

C) Electrolytic cell

D) Fuel cell

Q: The standard reduction potential for the two half-cell reactions: Cr³⁺ + 3e → Cr (E°=-0.740V), Fe³⁺ +3e → Fe (E°=+0.74V): (ETEA 2018)

A) Cr oxidizes & acts as anode

B) Fe reduces & acts as anode

C) Cr reduces & acts as anode

D) Fe oxidizes & acts as anode

Q: During the discharge of lead storage battery: (ETEA 2019)

A) Pb is dissolved at the cathode

B) Pb is deposited at the cathode

C) PbSO₄ is formed both at anode and cathode

D) Concentration of H₂SO₄ increases