Question
You have three test tubes: one with dilute HCl, one with NaOH solution, and one with distilled water. Using both red and blue litmus papers, which observation correctly identifies the test tube containing the acidic solution?
Asked in RRB JE CBT 2 (CMA) · 2026
Ionic Equilibrium · Chemistry
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Acids produce hydrogen ions in aqueous solution, while bases supply hydroxide ions or accept protons.
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Questions Asked from Bases, Alkalis & the pH Scale in Previous Exams
See how often Bases, Alkalis & the pH Scale has appeared in previous-year questions across major government exams.
11UPSC Questions Asked in These Years:2010, 2011, 2012, 2013, 2014, 2020, 2021, 2022, 2023, 2024, 2026
10SSC Questions Asked in These Years:2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
6Railways Questions Asked in These Years:2016, 2018, 2021, 2022, 2025, 2026
16State PSC Questions Asked in These Years:2002, 2004, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
Bases, Alkalis & the pH Scale has appeared in 43 previous-year exam questions, most frequently in State PSC, UPSC and SSC.
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