Chemistry questions
29404 published questions with worked solutions.
- Among the following the number of state variables is _____. Internal energy (U), Volume (V), Heat (q), Enthalpy (H)
- Identify the incorrect statement from the following. (A) A circular path around the nucleus in which an electron moves is...
- Match List-I with List-II : List-I (Reaction): (a) Cd(s) + 2Ni(OH)_ 3 (s) CdO(s) + 2Ni(OH)_ 2 (s) + H_ 2 O(l) (b) Zn(Hg) + HgO(s)...
- Match List-I with List-II. List-I (Reaction): (a) 4NH_ 3 (g) + 5O_ 2 (g) NO(g) + 6H_ 2 O(g) (b) N_ 2 (g) + 3H_ 2 (g) 2NH_ 3 (g)...Not in JEE Main or NEET syllabus
- In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical? (a) Rb and Cs...
- Which of the reaction is suitable for concentrating ore by leaching process?Not in JEE Main or NEET syllabus
- The metal salts formed during softening of hardwater using Clark's method are :Not in JEE Main or NEET syllabus
- Terylene polymer is obtained by condensation of:Not in JEE Main or NEET syllabus
- Statements about Enzyme Inhibitor Drugs are given below : (a) There are Competitive and Non-competitive inhibitor drugs. (b)...Not in JEE Main or NEET syllabus
- For kinetic study of the reaction of iodide ion with H_ 2 O_ 2 at room temperature : (a) Always use freshly prepared starch...
- In the given reaction, X + Y + 3Z XYZ_ 3 . If one mole of each of X and Y with 0.05 mol of Z gives compound XYZ_ 3 (Given :...
- An element M crystallises in a body centred cubic unit cell with a cell edge of 300 pm. The density of the element is 6.0 g cm^...Not in JEE Main or NEET syllabus
- The number of paramagnetic species among the following is _____ . B_ 2 , Li_ 2 , C_ 2 , C_ 2 ^ - , O_ 2 ^ 2- , O_ 2 ^ + and He_ 2...
- 150 g of acetic acid was contaminated with 10.2 g ascorbic acid (C_ 6 H_ 8 O_ 6 ) to lower down its freezing point by (x 10^ -1...
- K_a for butyric acid (C_ 3 H_ 7 COOH) is 2 10^ -5 . The pH of 0.2 M solution of butyric acid is _____ 10^ -1 . (Nearest integer)...
- For the given first order reaction A B, the half life of the reaction is 0.3010 min. The ratio of the initial concentration of...
- The number of interhalogens from the following having square pyramidal structure is _____ : ClF_ 3 , IF_ 7 , BrF_ 5 , BrF_ 3 , I_...
- The disproportionation of MnO_ 4 ^ 2- in acidic medium resulted in the formation of two manganese compounds A and B. If the...
- Total number of relatively more stable isomer(s) possible for octahedral complex [Cu(en)_ 2 (SCN)_ 2 ] will be _____.
- Consider the following statements : (A) The principal quantum number 'n' is a positive integer with values of 'n' = 1, 2, 3, …....