MPSC PYQ

pH Scale

Tested in 2 real MPSC questions across 2 years (20162018). See it in context on the interactive Concept Graph →

Years it was asked

What you need to know first

Basic chemistry of acids and basesConcept of pHAcid-base indicators

What mastering this unlocks

Isoelectric pointProtein colloids

Real questions that test this

पर्जन्यस अम्ल पर्जन्य म्हणतात जेव्हा, pH चे मुल्य __________ असते. Rain is called acid rain, when its pH value is

a)(1) 7.0
b)(2) 8.3
c)(3) 7.9
d)(4) 5.6 पेक्षा कमी / Less than 5.6✓ Correct

Normal rain is slightly acidic due to dissolved CO2 with a pH of around 5.6. Rain with a pH value less than 5.6 is specifically termed acid rain.

pH मापणी ही पाणी द्रावणांची अम्लता व अलकधर्मिता मोजण्याकरिता वापरली जाते. ही मापणी हाइड्रोजन आयन (H+) चे संकेंद्रणावर आधारित असते. खालीलपैकी काय अम्ल नाही ? The pH scale, used to measure acidity and alkalinity of water solutions, is based on concentration of hydrogen ions (H+). Which of the following is not acidic ?

1)केळी / Bananas
2)रक्त / Blood✓ Correct
3)दूध / Milk
4)टोमॅटो / Tomatoes

Human blood is slightly alkaline with a pH of around 7.4, whereas bananas, milk, and tomatoes are acidic in nature.