Acids Bases Salts Exemplar — Class 10 Science NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 10 Science chapter "Acids Bases Salts Exemplar" — 5 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 10 Science chapter "Acids Bases Salts Exemplar" — 5 important questions with detailed answers for CBSE boa…
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NCERT Solutions for Class 10 Science — Acids Bases Salts Exemplar. Step-by-step answers to all 5 textbook questions from this chapter, written for CBSE board preparation and free to use.
Acids Bases Salts Exemplar — All 5 Questions Solved
Q1. Distinguish between acid and base with one property each.
Acid: sour taste, turns blue litmus red, pH < 7, example HCl. Base: bitter taste, turns red litmus blue, pH > 7, example NaOH. Acid + Base → Salt + Water (neutralization).
Q2. Calculate pH of solution with H+ ion concentration 10^-5 mol/L.
pH = -log[H+] = -log(10^-5) = 5. The solution is acidic (pH < 7).
Q3. What is salt? Name three salts and write their chemical formulas.
Salt is ionic compound formed by neutralization of acid and base. Examples: (1) Sodium chloride NaCl, (2) Potassium nitrate KNO3, (3) Calcium sulfate CaSO4.
Q4. Write balanced equation for reaction between HCl and NaOH. Identify type of reaction.
HCl + NaOH → NaCl + H2O. This is neutralization reaction (acid-base reaction). H+ + OH- → H2O. It is also exothermic (heat is released).
Q5. What is meant by pH? Why is pH important for living organisms?
pH is measure of acidity or alkalinity of solution. pH = -log[H+]. Scale 0-14: <7 acidic, 7 neutral, >7 basic. Important because: enzymes work at specific pH, blood pH must be 7.35-7.45 for life, soil pH affects plant growth, stomach needs pH 1.5-3.5 for digestion.
How to Use These Solutions
Attempt each question yourself first and only then compare with the worked answer. Marks in the CBSE board exam are awarded for the METHOD as much as the final result, so reproduce the steps rather than memorising the last line. Where a solution states a law, a formula or a definition, learn that wording — examiners look for it.
Related practice for this chapter: chapter MCQs, previous-year questions, revision notes and sample papers.