Created by StemPy LabThe true mass of a steel weight is . Student P weighs it three times on one balance and records , and . Statement I: The readings of student P are precise but not accurate. Statement II: If the true mass were not known, the precision of these readings could still be judged, but their accuracy could not.
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← A student writes the results of some calculations and roundings in her laboratory notebook. Each result should follow the NCERT rules for significant digits and for rounding off. (i) 2.5 × 1.25 is reported as 3.1. (ii) 4.52 m - 2.1 m is reported as 2.42 m. (iii) 2.865 rounded off to three significant digits is reported as 2.87. (iv) 0.04060 g is reported to have four significant digits. (v) A class register shows 40 students, and this number has an unlimited number of significant digits. How many of the statements above are correct?Four hydrocarbons are described in List-I. Atomic masses in g mol⁻¹: H 1, C 12. Match each with its molecular formula in List-II. List-I (Data) A. Empirical formula CH₃; molar mass 30 g mol⁻¹ B. 0.100 mol burns to give 0.200 mol of CO₂ and 3.60 g of water C. 92.3% carbon by mass; molar mass 78 g mol⁻¹ D. 1.30 g of it holds 1.20 g of carbon; molar mass 26 g mol⁻¹ List-II (Molecular formula) I. C₂H₂ II. C₂H₄ III. C₂H₆ IV. C₆H₆ →
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