Chemistry questions
29404 published questions with worked solutions.
- 3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers...
- According to molecular orbital theory, which of the following will not be a viable molecule ?
- The combustion of benzene (l) gives CO_2(g) and H_2O(l). Given that heat of combustion of benzene at constant volume is –3263.9...
- An aqueous solution contains 0.10 M H_2S and 0.20 M HCl. If the equilibrium constants for the formation of HS^- from H_2S is 1.0...
- An aqueous solution contains an unknown concentration of Ba^ 2+ . When 50 mL of a 1 M solution of Na_2SO_4 is added, BaSO_4 just...
- At 518°C, the rate of decomposition of sample of gaseous acetaldehyde, initially at a pressure of 363 Torr, was 1.00 Torr s^ -1...
- How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can...
- Which of the following compounds contains(s) no covalent bond(s) ? KCl, PH_3, O_2, B_2H_6, H_2SO_4
- Which of the following are Lewis acids ?
- Total number of lone pair of electrons in I_3^- ion is
- Hydrogen peroxide oxidises [Fe(CN)_6]^ 4- to [Fe(CN)_6]^ 3- in acidic medium but reduces [Fe(CN)_6]^ 3- to [Fe(CN)_6]^ 4- in...
- The oxidation states of Cr in [Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2], and K_2[Cr(CN)_2(O)_2(O_2)(NH_3)] respectively are :
- When metal 'M' is treated with NaOH, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. Compound...Not in JEE Main or NEET syllabus
- Consider the following reaction and statements : [ Co(NH_3)_4Br_2 ]^+ + Br^- [ Co(NH_3)_3Br_3 ] + NH_3 (I) Two isomers are...
- Glucose on prolonged heating with HI gives :
- The trans-alkenes are formed by the reduction of alkynes with :
- An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination ?
- When XO_2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO_3, a dark green product is formed...
- Among the oxides of nitrogen : N_2O_3, N_2O_4 and N_2O_5; the molecule(s) having nitrogen-nitrogen bond is/are -
- In Wilkinson's catalyst, the hybridization of central metal ion and its shape are respectively -