Chemistry questions
29404 published questions with worked solutions.
- If we consider that 16, in place of 1 12 ; mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole...
- In a multi – electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in...
- Which of the following statements in relation to the hydrogen atom is correct?
- Which of the following oxides is amphoteric in character?
- Which one of the following species is diamagnetic in nature?
- Lattice energy of an ionic compounds depends upon
- The molecular shapes of SF_4, CF_4 and XeF_4 are
- Benzene and toluene form nearly ideal solutions. At 20^ , the vapour pressure of benzene is 75 torr and that of toluene is 22...
- Consider an endothermic reaction, X Y with the activation energies E_b and E_f for the backward and forward reactions,...
- Consider the reaction: N_2 + 3H_2 2NH_3 carried out at constant temperature and pressure. If H and U are the enthalpy and...
- The exothermic formation of ClF_3 is represented by the equation: Cl_ 2(g) + 3F_ 2(g) 2ClF_ 3(g) ; rH = -329 kJ Which of the...
- If the bond dissociation energies of XY, X_2 and Y_2 (all diatomic molecules) are in the ratio of 1:1:0.5 and _fH for the...
- For the reaction 2NO_ 2(g) 2NO_ (g) + O_ 2(g) , (K_c = 1.8 10^ -6 at 184C ) (R = 0.0831 kJ/(mol.K) When K_p and K_c are compared...
- An amount of solid NH_4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. Pressure....
- The solubility product of a salt having general formula MX_2, in water is: 4 10^ -12 . The concentration of M^ 2+ ions in the...
- Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be
- What is the conjugate base of OH^-?
- Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the...
- The number and type of bonds between two carbon atoms in calcium carbide are
- The structure of diborane (B_2H_6) contains