Which of the following is used to chemically test starch?  

This question was previously asked in
SSC CGL 2023 Tier-I Official Paper (Held On: 17 Jul 2023 Shift 1)
View all SSC CGL Papers >
  1. Chlorine solution  
  2. lodine solution
  3. Sulphur solution  
  4. Bromine solution 

Answer (Detailed Solution Below)

Option 2 : lodine solution
super-pass-live
Free
SSC CGL Tier 1 2025 Full Test - 01
3.3 Lakh Users
100 Questions 200 Marks 60 Mins

Detailed Solution

Download Solution PDF

The correct answer is lodine solution.Key Points

  • Iodine solution is used to chemically test for the presence of starch.
  • When iodine solution is added to a sample that contains starch, the solution turns blue-black in color.
  • Chlorine solution is not used to test for starch.
    • Chlorine is a strong oxidizing agent and can react with starch, but this reaction is not specific to starch and can occur with other organic compounds as well.
  • Sulphur solution is also not used to test for starch.
    • Sulphur is not known to react with starch in a way that produces a visible color change.
  • Bromine solution is sometimes used to test for starch, but it is less commonly used than iodine solution.
    • When bromine solution is added to a sample that contains starch, the solution turns orange in color.

Additional Information

  • Starch is a complex carbohydrate that is commonly found in plants.
  • It is an important source of energy for humans and animals.
  • Starch is made up of two types of molecules: amylose and amylopectin.
  • Amylose is a linear molecule, while amylopectin is highly branched.
  • Both types of molecules can be detected with iodine solution.
  • Hence, the correct answer is option 2 (iodine solution) as it specifically reacts with starch to produce a blue-black color.
Latest SSC CGL Updates

Last updated on Jul 9, 2025

-> The SSC CGL Notification 2025 for the Combined Graduate Level Examination has been officially released on the SSC's new portal – www.ssc.gov.in.

-> Bihar Police Admit Card 2025 Out at csbc.bihar.gov.in

-> This year, the Staff Selection Commission (SSC) has announced approximately 14,582 vacancies for various Group B and C posts across government departments.

-> The SSC CGL Tier 1 exam is scheduled to take place from 13th to 30th August 2025.

->  Aspirants should visit ssc.gov.in 2025 regularly for updates and ensure timely submission of the CGL exam form.

-> Candidates can refer to the CGL syllabus for a better understanding of the exam structure and pattern.

-> The CGL Eligibility is a bachelor’s degree in any discipline.

-> Candidates selected through the SSC CGL exam will receive an attractive salary. Learn more about the SSC CGL Salary Structure.

-> Attempt SSC CGL Free English Mock Test and SSC CGL Current Affairs Mock Test.

-> The AP DSC Answer Key 2025 has been released on its official website.

-> The UP ECCE Educator 2025 Notification has been released for 8800 Posts.

More Chemical Tests Questions

Get Free Access Now
Hot Links: teen patti cash game teen patti teen patti 3a