Chemistry questions
29404 published questions with worked solutions.
- For one mole of an ideal gas, which of these statements must be true ? (a) U and H each depends only on temperature (b)...
- Among statements (a) – (d), the correct ones are- (a) Lime stone is decomposed to CaO during the extraction of iron from its...Not in JEE Main or NEET syllabus
- The ionic radii of O^ 2- , F^- , Na^+ and Mg^ 2+ are in the order
- At 300 K, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is 550 mm of Hg. At the same...
- The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is _______ .
- If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in...
- A 20.0 mL solution containing 0.2 g impure H_2O_2 reacts completely with 0.316 g of KMnO_4 in acid solution. The purity of H_2O_2...
- The one that can exhibit highest paramagnetic behaviour among the following is : gly = glycinato; bpy = 2, 2'-bipyridine
- 250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO_3 and 0.1 M AuCl. The solution was...
- The reaction in which the hybridization of the underlined atom is affected is :
- The molecule in which hybrid MOs involve only one d-orbital of the central atom is :
- An alkaline earth metal 'M' readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to...Not in JEE Main or NEET syllabus
- The major product [B] In the following reactions is : CH_3 - CH_2 - CH(CH_3) - CH_2 - OCH_2 - CH_3 [ Heat ] HI [ A ] [ ] alcohol...
- The incorrect statements(s) among (a) – (c) is are : (a) W(VI) is more stable than Cr(VI). (b) in the presence of HCl...
- A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, HCHO and water. The component which...Not in JEE Main or NEET syllabus
- The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature...
- Consider the following equations: 2Fe^ 2+ +H_2O_2 xA+yB (in basic medium) 2MnO_4^-+6H^++5H_2O_2 x'C+y'D+z'E (in acidic medium)...
- A 100 mL solution was made by adding 1.43 g of Na_2CO_3.xH_2O . The normality of the solution is 0.1 N. The value of x is...
- The osmotic pressure of a solution of NaCl is 0.10 atm and that of a glucose solution is 0.20 atm. The osmotic pressure of a...
- The number of chiral centes present in threonine is ________.