Q: 105 (CDS-I/2014)

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Which of the following solutions will not change the colour of blue litmus paper to red?
1. Acid solution
2. Base solution
3. Common salt solution
Select the correct answer using the code given below.
question_subject: 
Science
question_year: 
2014
question_exam: 
CDS-I
stats: 
0,400,328,128,400,88,112