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For the Assertion (A) and Reason (R) below, choose the correct alternative:
Assertion (A) : When common salt is kept open, it absorbs moisture from the air.
Reason (R) : Common salt contains magnesium chloride.

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CSIR CERI JSA Official Paper-I (Held On: 2022)
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  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.

Answer (Detailed Solution Below)

Option 1 : Both (A) and (R) are true and (R) is the correct explanation of (A).
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Detailed Solution

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Assertion (A) When common salt is kept open, it absorbs moisture from the air. → True

Reason (R) Common salt contains magnesium chloride → True

Magnesium chloride present in common salt is deliquescent and absorbs moisture from the air. Thus the reason (R) is the correct explanation of the assertion (A).

Thus, Both A and R are true and R is the correct explanation of A.

Hence, "Option 1" is the correct answer.

Additional InformationWhile pure sodium chloride is not deliquescent, common salt often contains impurities , such as magnesium chloride. Magnesium chloride is deliquescent meaning it absorbs moisture from the air and eventually dissolves in it. This explains why common salt becomes moist when exposed to air.

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Latest CSIR Junior Secretariat Assistant Updates

Last updated on Jun 19, 2025

->The CSIR Junior Secretariat Assistant Merit List & Final Response Sheet has been released.

-> The CSIR Junior Secretariat Assistant 2025 written examination for Advt No. CRRI/02/PC/JSA-JST/2025 was conducted from 13th to 19th May 2025.

-> Candidates had applied online from 22nd March to 21st April 2025.  

-> The CSIR JSA salary ranges from INR 19,900 - INR 63,200 (Indian Institute of Petroleum, Dehradun) and INR 35,600 (Indian Institute of Toxicology Research).

-> The selection of candidates for this post will be based on a Written Exam, followed by a Computer Typing Test.

-> Prepare for the exam with CSIR Junior Secretariat Assistant Previous Year Papers.

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