Chemistry questions
29404 published questions with worked solutions.
- Given below are two statements : Statement-I : C_2H_5OH and AgCN both can generate nucleophile. Statement-II : KCN and AgCN both...
- Match list-I with list-II : List-I: (A) Mercury (B) Copper (C) Silicon (D) Nickel List-II: (i) Vapour phase refining (ii)...Not in JEE Main or NEET syllabus
- A hard substance melts at high temperature and is an insulator in both solid and molten state. This solid is most likely to be a...Not in JEE Main or NEET syllabus
- A reaction has a half life of 1 min. The time required for 99.9% completion of the reaction is ______ min. (Round off to the...
- The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 Scm^2...
- The number of species below that have two lone pairs of electrons in their central atom is ____ (Round off to the Nearest...
- A xenon compound 'A' upon partial hydrolysis gives XeO_2F_2. The number of lone pair of electrons present in compound A is ______...
- The gas phase reaction 2A(g) A_2(g) at 400 K has G^0 = + 25.2 kJ mol^ -1 . The equilibrium constant K_C for this reaction is...
- In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH_3)_2]^+ per...
- The solubility of CdSO_4 in water is 8.0 10^ -4 mol L^ -1 . Its solubility in 0.01 M H_2SO_4 solution is ______ 10^ -6 mol L^ -1...
- A solute dimerizes in water. The boiling point of a 2 molar solution of A is 100.52ºC. The percentage association of A is_____....
- 10.0 ml of Na_2CO_3 solution is titrated against 0.2 M HCl solution. The following titre values were obtained in 5 readings 4.8...
- The ionic radius of Na^+ ions is 1.02 Å. The ionic radii (in Å) of Mg^ 2+ and Al^ 3+ , respectively, are-
- Reagent, 1-naphthylamine and sulphanilic acid in acetic acid in used for the detection of
- A non-reducing sugar "A" hydrolyses to give two reducing mono saccharides. Sugar A is –
- Match the list –I with list – II List –I (Class of Drug): (a) Antacid (b) Artificial sweetener (c) Antifertility (d)...Not in JEE Main or NEET syllabus
- Chlorophyll is a coordination compound of magnesium. Vitamin B–12, cyanocobalamine is a coordination compound of cobalt....
- Match the list –I with list – II : List-I (Chemicals): (a) Alcoholic potassium hydroxide (b) Pd/ BaSO_4 (c) BHC (Benzene...
- C_3H_6O can show : CH_3-CH_2-CH=O and CH_3-CO-CH_3
- A certain orbital has no angular nodes and two radial nodes. The orbital is :