Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

JEE Main 20254 AprilEvening Shift

Exam: JEE Main
Year: 2025
Date: 4 April
Shift: Evening Shift
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

JEE Main 2025 · 4 April · Evening Shift · Chemistry · Some Basic Concepts of Chemistry

The amount of calcium oxide produced on heating 150 kg limestone (...

The amount of calcium oxide produced on heating 150 kg limestone (

75 \%

pure) is ______ kg. (Nearest integer)
Given : Molar mass (in

\mathrm{g} \mathrm{mol}^{-1}

) of Ca-40, O-16, C-12

Correct answer

0

Step-by-step solution

\begin{aligned} & \mathrm{CaCO}_3 \rightarrow \mathrm{CaO}+\mathrm{CO}_2 \\ & \text{ mass\text{ of } } \mathrm{CaCO}_3=\frac{150 \times 75}{100}=112.5 \mathrm{ kg} \\ & =112500 \mathrm{ g} \\ & \mathrm{n}_{\mathrm{CaCO}_3}=1125 \\ & \mathrm{So} \text{ moles of } \mathrm{CaO}=1125 \\ & \quad \text{ mass of } \mathrm{CaO}=\frac{1125 \times 56}{1000}=63 \mathrm{ kg} \\ & \text{ Correct answer } \Rightarrow 63\end{aligned}

Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

Match List-I with List-II. List-I Mass of substance List-II Number of atoms A. 1.8 mg… JEE Main 2026 Which of the following contain the same number of atoms ? (Given : Molar mass in g mol ^… JEE Main 2026 An oxide of iron contains 69.9\% iron, its empirical formula, is: (Given: Molar mass of… JEE Main 2026 What volume of hydrogen gas at STP would be liberated by action of 50 mL of H_2SO_4 of… JEE Main 2026 How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given… JEE Main 2026 The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684… JEE Main 2026 Number of moles and number of molecules in 1.4187 L of SO_2 at STP respectively are: JEE Main 2026 The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1 . It has two… JEE Main 2026 Full Some Basic Concepts of Chemistry list All JEE Main PYQs