Which one among the following will you put into pure water in order to pass electric current through it ?

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Q: 104 (CDS-II/2011)
Which one among the following will you put into pure water in order to pass electric current through it ?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,21,11,1,1,21,9

keywords: 

{'pure water': [0, 0, 0, 1], 'kerosene': [2, 2, 3, 2], 'lemon juice': [0, 0, 2, 3], 'mustard oil': [0, 0, 1, 0], 'electric current': [0, 1, 0, 6], 'sugar': [0, 0, 0, 1]}

To pass electric current through pure water, you would need to add a substance that can conduct electricity.

Option 1: Kerosene is a nonpolar substance and does not conduct electricity. Therefore, adding kerosene to water will not allow the flow of electric current.

Option 2: Mustard oil is also a nonpolar substance and does not conduct electricity. Therefore, adding mustard oil to water will not allow the flow of electric current.

Option 3: Lemon juice is an acidic substance and contains ions that can conduct electricity. Adding lemon juice to water will create an electrolyte solution, allowing the flow of electric current. Hence, this is the correct option for passing electric current through water.

Option 4: Sugar is a nonpolar substance and does not contain ions that can conduct electricity. Therefore, adding sugar to water will not allow the flow of electric current.

In conclusion, option 3 which is lemon juice is the correct substance to add to pass electric current through pure water.