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. 1When a metal sulphate is heated in dry test tube, the colour changes from blue to white. Then metal sulphate may beChemistry· figure
2. 2[IMAGE] of the solution in the anode compartment of the following cell at [IMAGE] is x when [IMAGE] Find out xChemistry· figure
3. 3has four choicesChemistry· Physical Chemistry· Moderate· figure
4. 4are INTEGER ANSWER TYPE Questions. (The answer of each of the questions is 2 digits 21 Energy of an emitted photon with wavelength 620 nm…Chemistry· Physical Chemistry· Easy· figure
5. 539.4 kg of gold was recovered from a smuggler. The number of atoms of gold recovered are: 39.4 ?Chemistry· Physical Chemistry· Easy· figure
6. 615 mL of a gaseous hydrocarbon was exploded with 72 mL of oxygen. The volume of gases on cooling was found to be 57 mL, 30 mL of which was…Chemistry· Physical Chemistry· Tough
7. 7Which of the following compounds have sulphur atom in its maximum oxidation state: X = H_2SO_4; Y = H_2SO_5; Z = H_2S_2O_8Chemistry· Physical Chemistry· Easy
8. 8The chemical formula of Phosphorous acid isChemistry· Physical Chemistry· Easy
9. 9Which of the following statement is correctChemistry· Physical Chemistry· Easy
10. 10Example of super octet molecule isChemistry· Physical Chemistry· Easy
11. 11Consider the following statements: I II III IV In [IMAGE] 1. There are 6[IMAGE] and 3[IMAGE] bonds. 2. Carbon I & II are sp^2 hybridised.…Chemistry· Physical Chemistry· Easy· figure
12. 12In P_4 O_10 molecule (A) There are 4 P-P bond (B) There are 8 P-O bond (C) The bond angle is 180° (D) The phosphorus atom is sp^3…Chemistry· Physical Chemistry· Easy
13. 13Which of the following statements is not correct from the point of view of molecular orbital theoryChemistry· Physical Chemistry· Tough· figure
14. 14Sulphur exist in different allotropic forms like S2, S6 and S8 etc. If equal moles of these three forms are taken in separate containers,…Chemistry· Physical Chemistry· Easy· figure
15. 15has four choicesChemistry
16. 16The hydrated salt Na_2CO_3.xH_2O undergoes 63 loss in mass on heating and becomes anhydrous.Calculate the value of x. Na_2CO_3.xH_2O 63 xChemistry· Physical Chemistry· Moderate· figure
17. 171 g sample of alkaline earth metal react completely with 4.08 g H2SO_4 and yield an ionic product MSO_4. Then find out the atomic mass of…Chemistry· Physical Chemistry· Moderate· figure
18. 18In the given, how many atoms have greater first ionisation energies than Boron ? ? Li Be C N O F HeChemistry· Physical Chemistry· Easy
19. 19The total number of lone pairs in chlorate ion isChemistry· Physical Chemistry· Easy· figure
20. 20are INTEGER ANSWER TYPE Questions. (The answer of each of the questions is 2 digits integer)]Chemistry
21. 21Total number of H_2 molecules that can be obtained from all hydrogen atoms of 10 formula units of CH_3COONH_4 is: CH_3COONH_4 10 H2Chemistry· Physical Chemistry· Moderate· figure
22. 22Calculate the ratio of the energy of a photon of wavelength 3000 to that of a photon of wavelength respectively. 3000 - s - sChemistry· Physical Chemistry· Easy· figure
23. 23Which of the following is correct statement? (A) The ratio of e/m value for H^+ & He^+ is 1: 2. (B) The ratio of e/m value for He^+ & Li^2+…Chemistry· Physical Chemistry· Moderate· figure
24. 24In a gaseous mixture, if an alkane (C_xH_2x + 2) and an alkene (C_yH_2y) are taken in 2: 1 mole ratio, the average molecular weight of…Chemistry· Physical Chemistry· Tough· figure