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. 1How many molecules are there in the unit cell of sodium chloride?Chemistry· Physical Chemistry· Easy
2. 2of Fe in Alloy Invar isChemistry· Inorganic Chemistry· Easy
3. 3Hexagonal close packing is found in crystal lattice ofChemistry· Physical Chemistry· Moderate
4. 4The inter metallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The…Chemistry· Physical Chemistry· Moderate
5. 5In the Bragg's equation for diffraction of X-rays, n represents forChemistry· Physical Chemistry· Easy
6. 6A solid is made of two elements X and Z. The atoms Z are in CCP arrangement while the atom X occupy all the tetrahedral sites. What is the…Chemistry· Physical Chemistry· Moderate
7. 7Ferrous oxide has a cubic structure and each edge of the unit cell is 5.0 Assuming density of the oxide as 4.0 g - cm^-3, then the number…Chemistry· Physical Chemistry· Tough
8. 8Main function of roasting isChemistry· Inorganic Chemistry· Moderate
9. 9Purpose of smelting of an ore isChemistry· Inorganic Chemistry· Moderate
10. 10The vapour pressure lowering caused by the addition of 100 g of sucrose (molecular mass = 342 to 1000 g of water if the vapour pressure of…Chemistry· Physical Chemistry· Moderate· figure
11. 11Nitrogen is liberated by the thermal decomposition of onlyChemistry· Inorganic Chemistry· Moderate· figure
12. 12Which of the following is in the increasing order of the ionic character?Chemistry· Inorganic Chemistry· Moderate
13. 13Increasing order of solubility isChemistry· Inorganic Chemistry· Easy
14. 14Salicylaldehyde can be prepared from (a) Phenol and chloroform (b) Phenol, chloroform and sodium hydroxide (c) Phenol, carbon tetrachloride…Chemistry· Organic Chemistry· Moderate· figure
15. 15Phenolphthalein is obtained by heating phthalic anhydride with conc. H_2 SO_4 andChemistry· Organic Chemistry· Moderate· figure
16. 16Reaction of phenol with dil. HNO_3 givesChemistry· Organic Chemistry· Moderate· figure
17. 17When Phenol is heated with phthalic anhydride in concentrated sulphuric acid and the hot reaction mixture is poured into a dilute solution…Chemistry· Organic Chemistry· Moderate· figure
18. 18The reaction of C_2H_5OH with H_2SO_4 does not giveChemistry· Organic Chemistry· Moderate· figure
19. 19Phenol is treated with bromine water and shaken well. The white precipitate formed during the process is (a) m-bromophenol (b) 2,…Chemistry· Organic Chemistry· Easy· figure
20. 20With oxalic acid, glycerol at 260º C givesChemistry· Organic Chemistry· Moderate· figure
21. 21Lowering of vapour pressure is highest forChemistry· Physical Chemistry· Moderate· figure
22. 22[IMAGE] In the above reaction A, B and C are the following compoundsChemistry· Organic Chemistry· Tough· figure
23. 230.6 g of a solute is dissolved in 0.1 litre of a solvent, which develops an osmotic pressure of 1.23 atm at 27ºC. The molecular mass of the…Chemistry· Physical Chemistry· Moderate· figure
24. 24The amount of urea to be dissolved in 500 ml of water (K = 18.6 mole^-1 in 100g solvent) to produce a depression of 0.186ºC in freezing…Chemistry· Physical Chemistry· Easy· figure