23 verified questions · ~21 minutes · answer key checked against the official NTA final key across multiple sources. Text-only questions (diagram-based excluded until they can be shown properly).
A sample of CaCO₃ and MgCO₃ weighed 2.21 g is ignited to constant weight of 1.152 g. The composition of mixture is: (Given molar mass in g mol⁻¹ — CaCO₃: 100, MgCO₃: 84)
Select the option with correct property:
Answers are revealed after you attempt — that's what makes the diagnosis honest.