Properties of Matter & Measurement — NEET Chemistry MCQs with Solutions

Solution: Physical properties such as colour, odour, melting point, boiling point and density can be measured or observed without changing the identity or composition of the substance. Combustibility, reactivity with acids and acidity all require a chemical change to be observed, so they are chemical properties.

Solution: Mass is the amount of matter present in a substance and stays constant everywhere. Weight is the force exerted by gravity on the object, so it can change from place to place as gravity changes. Hence only the first statement is correct.

Solution: Density = mass ÷ volume = 60 g ÷ 20 cm³ = 3 g cm⁻³. Inverting the ratio (20 ÷ 60) gives the wrong 0.33 g cm⁻³, while multiplying (60 × 20) gives 1200 g cm⁻³.

Solution: Since 1 L = 1000 cm³, 2.5 L = 2.5 × 1000 = 2500 cm³. Using a factor of 100 gives 250, and a factor of 10000 gives 25000 — both are wrong powers of ten.

Solution: °F = (9/5)(37) + 32 = 66.6 + 32 = 98.6 °F. Forgetting to add 32 leaves 66.6 °F, and 310.15 is the kelvin value (37 + 273.15), not the Fahrenheit reading.

Solution: mass = density × volume = 0.8 g cm⁻³ × 50 cm³ = 40 g. Dividing volume by density (50 ÷ 0.8) gives the wrong 62.5 g.

Solution: K = °C + 273.15 = (−23) + 273.15 = 250.15 K. Ignoring the negative sign and adding +23 gives the wrong 296.15 K; 273.15 K corresponds to 0 °C.