1
JEE Main 2025 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
The atomic number of the element from the following with lowest 1st ionisation enthalpy is:
2
JEE Main 2025 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match the LIST-I with LIST-II
| LIST-I (Complex/ Species) | LIST-II (Shape & magnetic moment) |
|---|---|
| A. [Ni(CO)4] | I. Tetrahedral, 2.8 BM |
| B. [Ni(CN)4]2– | II. Square planar, 0 BM |
| C. [NiCl4]2– | III. Tetrahedral, 0 BM |
| D. [MnBr4]2– | IV. Tetrahedral, 5.9 BM |
Choose the correct answer from the options given below:
3
JEE Main 2025 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match the LIST-I with LIST-II
| LIST-I | LIST-II |
|---|---|
| A. Carbocation | I. Species that can supply a pair of electrons. |
| B. C-Free radical | II. Species that can receive a pair of electrons. |
| C. Nucleophile | III. sp2 hybridized carbon with empty p-orbital. |
| D. Electrophile | IV. sp2/sp3 hybridized carbon with one unpaired electron. |
Choose the correct answer from the options given below:
4
JEE Main 2025 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eighth of its initial concentration are $t_1$ and $t_2$ (s), respectively. The ratio $t_1/t_2$ will be:
Paper analysis
Total Questions
Chemistry
25
Mathematics
25
Physics
25
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