Chemistry questions
29404 published questions with worked solutions.
- The correct order of melting points of dichlorobenzenes is
- A protein 'X' with molecular weight of 70,000 u, on hydrolysis gives amino acids. One of these amino acid is :
- The methods NOT involved in concentration of ore are A. Liquation B. Leaching C. Electrolysis D. Hydraulic washing E. Froth...Not in JEE Main or NEET syllabus
- The oxidation state of phosphorus in hypophosphoric acid is + ____________.
- For reaction : SO_2(g)+ 1 2 O_2(g) SO_3(g) Kp = 2 10^ 12 at 27°C and 1 atm pressure. The K_c for the same reaction is...
- How many of the transformations given below would result in aromatic amines? ____________
- The enthalpy change for the conversion of 1 2 Cl_2(g) to Cl^-(aq) is (–) ____________kJ mol^ -1 (Nearest integer) Given : _ dis...
- The logarithm of equilibrium constant for the reaction Pd^ 2+ +4Cl^- PdCl_4^ 2- is ____________. (Nearest integer) Given :...
- A The rate constants of the above reaction at 200 K and 300 K are 0.03 min^ -1 and 0.05 min^ -1 respectively. The activation...
- At 27°C, a solution containing 2.5 g of solute in 250.0 mL of solution exerts an osmotic pressure of 400 Pa. The molar mass of...
- The species having bond order different from that in CO is
- Extraction of zinc from zinc blende is achieved byNot in JEE Main or NEET syllabus
- The number of structural isomers for C_6H_ 14 is
- The percentage of p-character in the orbitals forming P–P bonds in P_4 is
- When 20 g of naphthoic acid (C_ 11 H_8O_2) is dissolved in 50 g of benzene (K_f = 1.72 K kg mol⁻¹), a freezing point depression...
- The value of _ 10 K for a reaction A ⇌ B is (Given : _rH^ _ 298K = -54.07 kJ mol⁻¹, _rS^ _ 298K = 10 J K⁻¹ mol⁻¹ and R = 8.314 J...
- STATEMENT-1 : Boron always forms covalent bond. because STATEMENT-2 : The small size of B^ 3+ favours formation of covalent bond.
- STATEMENT-1 : In water, orthoboric acid behaves as a weak monobasic acid. because STATEMENT-2 : In water, orthoboric acid acts as...
- STATEMENT-1 : p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid. because STATEMENT-2 : o-Hydroxybenzoic...
- STATEMENT-1 : Micelles are formed by surfactant molecules above the critical micellar concentration (CMC). because STATEMENT-2 :...Not in JEE Main or NEET syllabus