Misprints in the NCERT Class 10 Science and Maths textbooks
While writing Turron's Class 10 question bank from the NCERT text, line by line, we kept a list of the places where the printed book slips: a misspelt reagent, a wrong subscript, a table a hundred times out. Each entry below was checked against the printed page. None changes what the board examines; all of them trip up a student reading carefully. If you find another, report it and it goes on this page with your name if you want it there.
8 entries: 6 in Science, 2 in Maths. A misprint is a printing or spelling slip; a disputed fact is a different thing and goes through the proof ledger.
Printed: "Hydrogen sulphide gas burns in air to give water and sulpur dioxide."
Meant: sulphur dioxide (SO₂).
A spelling slip in a question students are asked to balance; the equation is 2H₂S + 3O₂ → 2H₂O + 2SO₂ either way.
Printed: "iron fillings"
Meant: iron filings, the fine shavings of iron.
Appears twice in the chapter. Filings are shavings; a filling is what a dentist does.
Printed: "two water molecules as water of cyrstallisation"
Meant: crystallisation.
The term is examined; students should spell it as the rest of the chapter does.
Printed: "What will happen if a solution of sodium hydrocarbonate is heated?"
Meant: sodium hydrogencarbonate (NaHCO₃, baking soda), the compound the section describes.
"Hydrocarbonate" is not a compound; the heating reaction asked for is 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂.
Printed: "Why does dry HCL gas not show acidic behaviour"
Meant: HCl, with a lower-case l for chlorine.
Element symbols are case-sensitive: Cl is chlorine, and CL is nothing. Board answers lose marks for the same slip.
Printed: Constantan 49 × 10⁻⁶ Ω m, Manganin 44 × 10⁻⁶ Ω m, Nichrome 100 × 10⁻⁶ Ω m.
Meant: The measured values are about a hundred times smaller: constantan about 49 × 10⁻⁸ Ω m, manganin about 44 × 10⁻⁸ Ω m, nichrome about 100 × 10⁻⁸ Ω m (1.0 to 1.1 × 10⁻⁶ Ω m).
The text above the table says conductors lie between 10⁻⁸ and 10⁻⁶ Ω m, and the metals in the same table are given in 10⁻⁸; the alloy rows look shifted by two powers of ten. Use the table's values in an exam answer, since the board keys to the book, but know the order of magnitude when you meet a real wire.
Printed: a₁/a₂ ≠ b₁/b₁
Meant: a₁/a₂ ≠ b₁/b₂, the condition for a unique solution.
The line directly beneath it, (ii), has b₁/b₂ correctly, and Table 3.1 on page 26 is right: it is a typesetting slip in the summary. Trust the table.
Printed: "atmost"
Meant: at most, two words.
A spacing slip, not a term; a quadratic has at most two real roots.
Why we read this closely
Every question in Turron's bank cites the NCERT sentence it rests on, and every answer was checked by a second reviewer. That discipline is what turns up the slips. The same questions power the free Class 10 test, the chapter pages and the sample papers.