Chemistry questions
29404 published questions with worked solutions.
- A process will be spontaneous at all temperatures if:
- The principle of column chromatography is:
- At room temperature, a dilute solution of urea is prepared by dissolving 0.60 g of urea in 360 g of water. If the vapour pressure...
- Three complexes, [CoCl(NH_3)_5]^ 2+ (I), [Co(NH_3)_5H_2O]^ 3+ (II) and [Co(NH_3)_6]^ 3+ (III) absorb light in the visible region....
- Match the refining methods (Column I) with metals (Column II). List-I: (I) Liquation (II) Zone Refining (III) Mond Process (IV)...Not in JEE Main or NEET syllabus
- During the change of O_2 to O_2^-, the incoming electron goes to the orbital:
- Which of the following is a condensation polymer?Not in JEE Main or NEET syllabus
- Which of the following combination of statements is true regarding the interpretation of the atomic orbitals? (a) An electron in...
- A solution containing 62 g ethylene glycol in 250 g water is cooled to −10ºC. If K_f for water is 1.86 K kg mol^ -1 , the amount...
- For the following reaction, the mass of water produced from 445 g of C_ 57 H_ 110 O_6 is: 2C_ 57 H_ 110 O_6(s) + 163O_2(g) →...
- If the standard electrode potential for a cell is 2 V at 300 K, the equilibrium constant (K) for the reaction Zn(s) + Cu^ 2+ (aq)...
- The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is: (Specific heat of water...
- For the reaction, 2A + B → products, when the concentrations of A and B both were doubled, the rate of the reaction increased...
- The increasing basicity order of the following compounds is: (A) CH_3CH_2NH_2 (B) CH_3CH_2NH(CH_2CH_3) (C) (CH_3)_3N (D)...
- Homoleptic octahedral complexes of a metal ion 'M^ 3+ ' with three monodentate ligands L_1, L_2 and L_3 absorb wavelengths in the...
- When the first electron gain enthalpy ( _ eg H) of oxygen is −141 kJ/mol, its second electron gain enthalpy is:
- Consider the following reversible chemical reactions: A_2(g) + B_2(g) ⇌ 2AB(g); K_1 …(1) 6AB(g) ⇌ 3A_2(g) + 3B_2(g); K_2 …(2) The...
- Good reducing nature of H_3PO_2 is attributed to the presence of:
- The pH of rain water, is approximately:
- The transition element that has lowest enthalpy of atomization, is: