Practice/Question bank/JEE Main

JEE Main practice questions

NTA-style Physics, Chemistry and Maths MCQs with solutions. 2,688 questions in the bank.

1. 1Fluoxymesterone, C_20H_29FO_3, is an anabolic steroid. A solution is prepared by dissolving 10.0 mg of the steroid in 500 mL of water. How…Chemistry· Physical Chemistry· Tough· figure
2. 2A d-block element has total spin value of +3 or -3 then the magnetic moment of the element is approximately: d. +3 -3Chemistry· Physical Chemistry· Moderate· figure
3. 3S_1: Photoelectric effect can be explained on the basis of wave nature of electromagnetic radiations. - S_2: An orbital represented by n =…Chemistry· Physical Chemistry· Moderate· figure
4. 4Consider the isoelectronic ions, K^+, S^2-, Cl^- and Ca^2+. The radii of these ionic species follow the orderChemistry· Inorganic Chemistry· Easy
5. 5In which species positive charge is delocalised ?Chemistry· Organic Chemistry· Moderate· figure
6. 6Total number of structural unsaturated 3º alcohols possible with molecular formula C_6H_12O isChemistry· Organic Chemistry· Tough· figure
7. 7Which resonating structure of 1-Methoxycyclohexa-1,3-diene is impossible ?Chemistry· Organic Chemistry· Easy· figure
8. 8What is number of delocalised lone pairs in the following compound?Chemistry· Organic Chemistry· Moderate· figure
9. 9Suppose 40 w/w aqueous solution of glucose (C_6H_12O_6) and 20 w/w aqueous solution of urea(NH_2CONH_2) have equal molarity, then which…Chemistry· Physical Chemistry· Moderate
10. 10Electronic configuration of four elements A, B, C and D are given below: (A) 1s^22s^22p^6 (B) 1s^22s^22p^4 (C) 1s^22s^22p^63s^1 (D)…Chemistry· Inorganic Chemistry· Moderate
11. 1181 gm mixture of MgCO_3(s) and NH_2COONH_4(s) is heated to constant mass. MgCO_3(s) [IMAGE] MgO(s) + CO_2(g) NH_2COONH_4(s) [IMAGE]…Chemistry· Physical Chemistry· Tough· figure
12. 12Which of the following does not represent the correct order of the property indicated against it?Chemistry· Inorganic Chemistry· Moderate
13. 13Aspirin has the formula C_9H_8O_4. How many atoms of oxygen are there in a tablet weighing 360 mg ?Chemistry· Physical Chemistry· Easy
14. 14A 1.5 m solution of acetic acid (I) is mixed with 3 m solution of the acetic acid (II) to prepare 2m solution (m is molality of solution).…Chemistry· Physical Chemistry· Moderate
15. 15A bottle of H_3PO_4 solution contains 70 acid by mass. If the density of the solution is 1.54 g cm^-3, the volume of the H_3PO_4 solution…Chemistry· Physical Chemistry· Moderate· figure
16. 16x + y [IMAGE] x_2 y_3 2 moles of X and 4 moles of Y are mixed in a container. Difference of final moles of Y and X_2Y_3 isChemistry· Physical Chemistry· Easy· figure
17. 17Number of moles of CaO required to remove hardness from 1000 litre water having 324 ppm of calcium bicarbonate isChemistry· Physical Chemistry· Moderate· figure
18. 18How many of the following compounds are found to exist? (i) BiF_5 (ii) T[IMAGE] I_3 (iii) PbO_2 (iv) SnCl_2Chemistry· Inorganic Chemistry· Moderate· figure
19. 19A- (g) [IMAGE] A^2+ (g) [IMAGE] H = 1100 KJ/mol A (g) [IMAGE] A^2+ (g) [IMAGE] H = 1200 Electron gain enthalpy of A is P × 10^2 KJ/mol.…Chemistry· Inorganic Chemistry· Tough· figure
20. 20The electron gain enthalpy of a hypothetical element is -3 eV per atom. How much energy in kCal is released when 10 g of are completely…Chemistry· Inorganic Chemistry· Moderate
21. 21The amount of arsenic pentasulphide (As_2S_5) that can be obtained when 35.5arsenic acid (H_3AsO_4) is treated with excess H_2S in the…Chemistry· Physical Chemistry· Easy· figure
22. 22What is the correct order of second ionisation energy for the following ?Chemistry· Inorganic Chemistry· Moderate
23. 23Select equation having exothermic stepChemistry· Inorganic Chemistry· Moderate· figure
24. 24BaCl_2 + Na_3PO_4[IMAGE] Ba_3(PO_4)_2 + NaCl Which of the following statement (s) are correct, when 2 mol each of Na_3PO_4 and BaCl_2…Chemistry· Physical Chemistry· Moderate· figure