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. 1The correct order of increasing C-O bond length of $CO,{CO}_{3}^{2 -},{CO}_{2}$ isChemistry· Inorganic Chemistry· Easy
2. 2Molecular shapes of $SF_{4},CF_{4}$ and $XeF_{4}$ areChemistry· Inorganic Chemistry· Moderate
3. 3When the pressure is applied over system ice $\rightleftharpoons$ water what will happen?Chemistry· Physical Chemistry· Tough
4. 4The formula of potassium dicyano bis (oxalato) nickelate (II) isChemistry· Inorganic Chemistry· Easy
5. 5A certain buffer solution contains equal concentration of $X^{-}$and HX. The $K_{b}$ for $X^{-}$ is$10^{- 10}$. The pH of the buffer isChemistry· Physical Chemistry· Moderate
6. 6$MnO_{4}^{2 -}$(1 mole) in neutral aqueous medium isdisproportionateto X mole of $MnO_{4}^{-}$ and Y mole of $MnO_{2}$. 3X+6Y =Chemistry· Physical Chemistry· Tough
7. 7The conductivity of a saturated solution of ${BaSO}_{4}$is $3.06 \times 10^{- 6}{ohm}^{- 1}{cm}^{- 1}$ and its equivalentconductance is…Chemistry· Physical Chemistry· Easy
8. 8Given standard electrode potentials The standard electrode potential$E^{0}$for$Fe^{+ + +} + e^{-} \rightarrow Fe^{+ +}$ isChemistry· Physical Chemistry· Moderate
9. 9The increasing order of acidity among phenol, p-methylphenol, m-nitrophenol and p-nitrophenol is. Chose the correct integer as your option.Chemistry· Organic Chemistry· Easy· figure
10. 10If the bond dissociation energies of XY, X_2 and Y_2 (all diatomic molecules) are in the ratio of 1: 1: 0.5 and $\Delta_{f}H$ for the…Chemistry· Physical Chemistry· Moderate
11. 11The molar heat capacity of water at constant pressure is $75\ {J\ K}^{- 1}{mol}^{- 1}$. When 1.0 kJ of heat is supplied to 100 g of water…Chemistry· Physical Chemistry· Easy
12. 12Two separate bulbs contain ideal gases A and B. The density of gas A is twice that of gas B. The molecular mass of A is half that of gas B.…Chemistry· Physical Chemistry· Moderate
13. 13Nitrobenzene can be prepared from benzene by using a mixture of conc. $HNO_{3}$ and conc. $H_{2}SO_{4}$.In the nitrating mixture, $HNO_{3}$…Chemistry· Organic Chemistry· Moderate· figure
14. 14Choose the chain terminating step (a)$H_{2} \rightarrow H^{*} + H^{*}$ (b)$Br_{2} \rightarrow Br^{*} + Br^{*}$ (c)$Br^{*} + HBr \rightarrow…Chemistry· Organic Chemistry· Moderate
15. 15Which of the following will not lose asymmetry on reduction with LiAlH_4Chemistry· Organic Chemistry· Moderate
16. 16A solution of urea contains 8.6 gm/liter (mol. wt. 60.0. It is isotonic with a5 solution of a nonvolatile solute. The molecular weight of…Chemistry· Physical Chemistry· Easy
17. 17In which case formation of butane nitrile is possibleChemistry· Halogen· Easy
18. 18The carbon-based reduction method is NOT used for the extraction ofChemistry· Inorganic Chemistry· Easy
19. 19Given is the electronic configuration of element X: dlh rRo X dk bysDVªkWfud K L M N 2 8 11 2 The number of electrons present with = 2 in…Chemistry· Atomic Structure· Moderate
20. 20A hydrogen sample is prepared in a particular excited state. Photons of energy 2.55 eV get absorbed into the sample to take some of the…Chemistry· Atomic Structure· Moderate
21. 21Which of the following cannot evolve more than one gas (vapour) if heated in dry test tube. b.k ufydkChemistry· Salt Analysis· Moderate
22. 22The difference between the wave number of 1st line of Balmer series and last line of paschen series for Li2+ ion is: Li2+ fy, ckWej Js.kh…Chemistry· Atomic Structure· Moderate
23. 23The crystal field splitting energy for octahedral complex $\left( \Delta_{0} \right)$ and that for tetrahedral complex $\left( \Delta_{t}…Chemistry· Coordination Compounds· Moderate
24. 24Which of the following is a high spin complex ?Chemistry· Coordination Compounds· Tough· figure