Sail E0 Webinar

General Knowledge > General Science

REDOX REACTIONS MCQs

Total Questions : 25 | Page 2 of 3 pages
Question 11. The sum of the oxidation numbers in SCN- is equivalent to
  1.    0
  2.    -1
  3.    +1
  4.    +3
 Discuss Question
Answer: Option B. -> -1
Question 12. The sum of the oxidation numbers in Na2CO3 is equivalent to
  1.    0
  2.    -2
  3.    +1
  4.    -1
 Discuss Question
Answer: Option A. -> 0
Question 13. These keep track of the movement of electrons
  1.    (+) and (-) signs
  2.    oxidation numbers
  3.    coefficients
  4.    subscripts
 Discuss Question
Answer: Option B. -> oxidation numbers
Question 14. Combustion and single-replacement reactions are __________ redox reactions
  1.    always
  2.    never
  3.    sometimes
  4.    mostly
 Discuss Question
Answer: Option A. -> always
Question 15. A redox reaction is NOT:
  1.    all reactions
  2.    a combustion reaction
  3.    a reduction-oxidation reaction
  4.    a reaction in which electrons are transferred from one atom to another
 Discuss Question
Answer: Option A. -> all reactions
Question 16. Oxygen always has an oxidation number of
  1.    -1
  2.    1
  3.    2
  4.    -2
 Discuss Question
Answer: Option D. -> -2
Question 17. Which one of the following conversions is an example of reduction?
  1.    Copper (II) oxide to copper (II) sulfate
  2.    Copper (II) oxide to copper
  3.    Hydrochloric acid to chlorine
  4.    Lead (II) nitrate to lead (II) chloride
 Discuss Question
Answer: Option B. -> Copper (II) oxide to copper
Question 18. Is calcium oxidized or reduced in the following reaction? 2CaO--> 2Ca + O2
  1.    Oxidized
  2.    Reduced
 Discuss Question
Answer: Option B. -> Reduced
Question 19. What is a half-reaction of this equation, Na + Cl --> NaCl ?
  1.    Cl + e- --> Cl-
  2.    Cl - e- --> Cl-
  3.    Na --> Na + e-
  4.    Na° + Cl°--> Na+1Cl-1
 Discuss Question
Answer: Option A. -> Cl + e- --> Cl-
Question 20. Cl2 + 2e- --> 2Cl - is an example of:
  1.    a chemical reaction
  2.    redox
  3.    oxidation
  4.    reduction
 Discuss Question
Answer: Option D. -> reduction

Latest Videos
Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)
Direction Sense Test Part 1 Reasoning (Hindi)
Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE
Cube & Cuboid Part 1 Reasoning (Hindi)
Data Interpretation (DI) Basic Concept Reasoning (Hindi)
Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)
Sail E0 free webinar Webinars
Real Numbers Part 7 Class 10 Maths
Real Numbers Part 1 Class 10 Maths
Polynomials Part 1 Class 10 Maths

Latest Test Papers

Pie Chart - Test Paper 1 Data Interpretation Reasoning & DI
Tabulation - Test Paper 2 Data Interpretation Reasoning & DI
Test Paper 1 Direction Sense Test Reasoning & DI
ICA , RDIC,GFM Free Modal Test Paper - Non - Technical Branch Old Syllabus 2022 - SAIL Junior Officer E0
GFM Combined 1 Free Revision Test SAIL JO E-0