pH Scale
pH Scale is a Environment concept from the MPSC syllabus, tested in 3 past MPSC questions (2014, 2016, 2018). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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पर्जन्यस अम्ल पर्जन्य म्हणतात जेव्हा, pH चे मुल्य __________ असते. Rain is called acid rain, when its pH value is
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 ?
Human blood is slightly alkaline with a pH of around 7.4, whereas bananas, milk, and tomatoes are acidic in nature.
काही नैसर्गिकरित्या आढळणारे acids (आम्ल) त्यांच्या स्रोतासह दिलेले आहेत. चुकीची जोडी ओळखा : (a) व्हिनेगर - अॅसिटिक अॅसिड (b) संत्री - सायट्रिक अॅसिड (c) चिंच - टार्टारिक अॅसिड (d) टोमॅटो - ऑक्झॅलिक अॅसिड (e) आंबट दूध (दही) - लॅक्टिक अॅसिड (f) लिंबू - सायट्रिक अॅसिड (g) किटकाचा डंख - मेथॅनॉइक अॅसिड (h) नेटलचा डंख - सल्फ्युरिक अॅसिड Some naturally occurring acids are given below with their sources. Identify the incorrect pair : (a) Vinegar - Acetic acid (b) Oranges - Citric acid (c) Tamarind - Tartaric acid (d) Tomatoes - Oxalic acid (e) Sour milk (curds) - Lactic acid (f) Lemons - Citric acids (g) Ant sting - Methanoic acid (h) Nettle sting - Sulphuric acid
(a)व्हिनेगर - अॅसिटिक अॅसिड / Vinegar - Acetic acid
(b)संत्री - सायट्रिक अॅसिड / Oranges - Citric acid
(c)चिंच - टार्टारिक अॅसिड / Tamarind - Tartaric acid
(d)टोमॅटो - ऑक्झॅलिक अॅसिड / Tomatoes - Oxalic acid
(e)आंबट दूध (दही) - लॅक्टिक अॅसिड / Sour milk (curds) - Lactic acid
(f)लिंबू - सायट्रिक अॅसिड / Lemons - Citric acids
(g)किटकाचा डंख - मेथॅनॉइक अॅसिड / Ant sting - Methanoic acid
(h)नेटलचा डंख - सल्फ्युरिक अॅसिड / Nettle sting - Sulphuric acid
Nettle sting contains formic acid (methanoic acid), not sulfuric acid. Sulfuric acid is a strong mineral acid, whereas plant stings contain organic acids.