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. 1Amongst $Ni(CO)_{4},\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}$ and ${NiCl}_{4}^{2 -}$Chemistry· Coordination Compounds· Tough· figure
2. 2When a mixture containing phosphate is heated with conc. $HNO3$ and ammonium molybdate solution, a canary yellow precipitate is formed. The…Chemistry· Salt Analysis· Moderate
3. 3When white crystalline precipitate of magnesium ammonium arsenate is treated with acidified silver nitrate solution, precipitate of silver…Chemistry· Salt Analysis· Moderate
4. 4The Bouveault-Balance reduction involves ckWosYV&csysalChemistry· Alcohol, Phenol and Ethers· Moderate
5. 5An aqueous solution of colourless metal sulphate $M$, gives a white precipitate with $NH4OH$. This was soluble in excess of $NH4OH$. On…Chemistry· Salt Analysis· Moderate
6. 6In${CH}_{3}{CH}_{2}Br,\%$ of Br is ${CH}_{3}{CH}_{2}Br$Chemistry· Halogen· Easy
7. 7In extraction of metal how many of the following ores calcination process is involved. (i) Dolomite (ii) Malachite (iii) Calcite (iv)…Chemistry· Inorganic Chemistry· Tough
8. 8Consider Bohr's theory for hydrogen atom. The magnitude of angular momentum, orbit radius and velocity of the electron in n^thenergy state…Chemistry· Atomic Structure· Tough
9. 9$1\ g$of complex $\lbrack Cr(H2O)5Cl\rbrack Cl2.H2O$ was passed through a cation exchanger to produce $HCl$. The acid liberated was diluted…Chemistry· Coordination Compounds· Moderate
10. 10What amount of bromine will be required to convert 2 g of phenol into 2, 4, 6 -tribromophenol fQuksy dh 2 xzke dks esa cnyusChemistry· Alcohol, Phenol and Ethers· Moderate· figure
11. 11Best method of preparing alkyl chloride isChemistry· Halogen· Moderate
12. 12To prepare But-2-yne from 2, 2, 3, 3-Tetrachlorobutane, reagent used isChemistry· Hydrocarbon· Easy· figure
13. 13Ethanol is prepared industrially byChemistry· Alcohol, Phenol and Ethers· Moderate
14. 14Which gas is obtained when iodoform is heated with Ag powder ? tc s Ag pw.kZ ds lkFk xeZ rks izkIr gksrhChemistry· Hydrocarbon· Moderate· figure
15. 15Acetylene may be prepared by electrolysis ofChemistry· Hydrocarbon· Moderate· figure
16. 16How many of following are correctly matched for electrolytic reducing in molten state. Ore Reagent / Process Remark (a) Al2O3 AlF3 and CaF2…Chemistry· Inorganic Chemistry· Tough
17. 17The minimum voltage required to electrolyse of Al2O3 in the Hall-Heroult process is Given:$\Delta G_{f}^{\circ}\left( {Al}_{2}O_{3} \right)…Chemistry· Inorganic Chemistry· Tough
18. 18The following statements concern elements in the periodic table. Which of the following is true?Chemistry· Inorganic Chemistry· Moderate
19. 19Which one of the following substances used in dry cleaning is abetter strategy to control environmental pollution?Chemistry· Physical Chemistry· Easy
20. 20Bromination of cyclohexene under conditions given below yieldsChemistry· Organic Chemistry· Moderate· figure
21. 21Consider the reaction sequence below: [IMAGE] x isChemistry· Organic Chemistry· Tough· figure
22. 22Which one of the following reagents is not suitable for the elimination reaction?Chemistry· Organic Chemistry· Moderate· figure
23. 23The correct statement about the synthesis of erythritol (C(CH_2OH)_4) used in the preparation of PETN isChemistry· Organic Chemistry· Tough· figure
24. 24Fluorination of an aromatic ring is easily accomplished bytreating a diazonium salt with HBF_4. Which of the following conditions is…Chemistry· Organic Chemistry· Moderate· figure