JEE Main 2023 (Online) 25th January Morning Shift | JEE Main Year Wise Previous Years Questions

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

Inert gases have positive electron gain enthalpy. Its correct order is :

He < Ne < Kr < Xe

He < Xe < Kr < Ne

Xe < Kr < Ne < He

He < Kr < Xe < Ne

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Hydrocarbons Question 34 English

The correct sequence of reagents for the preparation of Q and R is :

$$\mathrm{(i)C{r_2}{O_3},770K,20~atm; (ii)Cr{O_2}C{l_2},{H_3}{O^ + }; (iii)NaOH;(iv){H_3}{O^ + }}$$

$$\mathrm{(i)Cr{O_2}C{l_2},{H_3}{O^ + };(ii)C{r_2}{O_3},770K,20~atm;(iii)NaOH;(iv){H_3}{O^ + }}$$

$$\mathrm{(i)KMn{O_4},O{H^ - };(ii)M{o_2}{O_3},\Delta ;(iii)NaOH;(iv){H_3}{O^ + }}$$

$$\mathrm{(i)M{o_2}{O_3},\Delta ;(ii)Cr{O_2}C{l_2},{H_3}{O^ + };(iii)NaOH;(iv){H_3}{O^ + }}$$

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

In the cumene to phenol preparation in presence of air, the intermediate is

JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Alcohols, Phenols and Ethers Question 41 English Option 1

JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Alcohols, Phenols and Ethers Question 41 English Option 2

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which one of the following reactions does not occur during extraction of copper?

$$\mathrm{2FeS + 3{O_2} \to 2FeO + 2S{O_2}}$$

$$\mathrm{FeO + Si{O_2} \to FeSi{O_3}}$$

$$\mathrm{CaO + Si{O_2} \to CaSi{O_3}}$$

$$\mathrm{2C{u_2}s + 3{O_2} \to 2C{u_2}O + 2S{O_2}}$$

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