Chemistry questions
29404 published questions with worked solutions.
- Given below are two statements: Statement (I): Aminobenzene and aniline are same organic compounds. Statement (II): Aminobenzene...
- Given below are two statements: Statement (I): Potassium hydrogen phthalate is a primary standard for standardisation of sodium...
- Ionic reactions with organic compounds proceed through (A) Homolytic bond cleavage (B) Heterolytic bond cleavage (C) Free radical...
- K_a for CH_3COOH is 1.8 × 10^ -5 and K_b for NH_4OH is 1.8 × 10^ -5 . The pH of ammonium acetate solution will be ______.
- Among the following oxides of p-block elements, number of oxides having amphoteric nature is ________. Cl_2O_7, CO, PbO_2, N_2O,...
- The lowest oxidation number of an atom in a compound A_2B is –2. The number of electrons in its valence shell is _______.
- Number of optical isomers possible for 2- chlorobutane _______.
- Consider the following reaction: 3PbCl_2 + 2(NH_4)_3PO_4 → Pb_3(PO_4)_2 + 6NH_4Cl. If 72 mmol of PbCl_2 is mixed with 50 mmol of...
- The number of white coloured salts, among the following is _______. (a) SrSO_4 (b) Mg(NH_4)PO_4 (c) BaCrO_4 (d) Mn(OH)_2 (e)...
- Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is _______. (a) –COOCH_3...
- The number of molecules/ions having trigonal bipyramidal shape is _______. PF_5, BrF_5, PCl_5, [PtCl_4]^ 2- , BF_3, Fe(CO)_5
- The potential for the given half cell at 298 K is (–) ________ × 10^ -2 V. 2H^+(aq) + 2e^- → H_2(g), [H^+] = 1M, P_ H_2 = 2 atm...
- The equilibrium constant for the reaction SO_3(g) ⇌ SO_2(g) + 12O_2(g) is K_C = 4.9 × 10^ -2 . The value of K_C for the reaction...
- The correct statement/s about Hydrogen bonding is/are: A. Hydrogen bonding exists when H is covalently bonded to the highly...
- Common name of Benzene-1, 2-diol is
- The adsorbent used in adsorption chromatography is/are A. silica gel B. alumina C. quick lime D. magnesia Choose the most...
- The correct order of the first ionization enthalpy is
- If an iron (III) complex with the formula [Fe(NH_3)_x(CN)_y]^- has no electron in its e_g orbital, then the value of x + y is
- Fuel cell, using hydrogen and oxygen as fuels, A. has been used in spaceship B. has as efficiency of 40% to produce electricity...
- Choose the Incorrect Statement about Dalton's Atomic Theory