JEE Main 2025 (Online) 28th January Evening Shift | Isolation of Elements Question 1 | Chemistry

$\underset{(X)}{\text { Solid }} \xrightarrow[]{\text { Heat }} \underset{(X)}{\text { Vapour }} \xrightarrow{\text { Cool }} \underset{(X)}{\text { Solid }}$

Extraction

Crystallization

Distillation

Sublimation

JEE Main 2023 (Online) 15th April Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which one of the following is not an example of calcination?

$\mathrm{CaCO}_{3} \cdot \mathrm{MgCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{MgO}+2 \mathrm{CO}_{2}$

$2 \mathrm{PbS}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{PbO}+2 \mathrm{SO}_{2}$

$\mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2}$

$\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O} \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{xH}_{2} \mathrm{O}$

JEE Main 2023 (Online) 13th April Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Given below are two statements related to Ellingham diagram:

Statement I : Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals.

Statement II : It consists of plots of $$\Delta_{\mathrm{f}} \mathrm{H}^{0}$$ vs $$\mathrm{T}$$ for formation of oxides of elements.

In the light of the above statements, choose the most appropriate answer from the options given below:

Both Statement I and Statement II are correct

Both Statement I and Statement II are incorrect

Statement I is correct but Statement II is incorrect

Statement I is incorrect but Statement II is correct