Chemistry questions
29404 published questions with worked solutions.
- The vapour pressure of pure benzene and methyl benzene at 27°C is given as 80 Torr and 24 Torr, respectively. The mole fraction...
- Consider the following test for a group-IV cation. M²⁺ + H₂S → A (Black precipitate) + byproduct; A + aqua regia → B + NOCl + S +...
- Consider the following first order gas phase reaction at constant temperature A(g) → 2B(g) + C(g). If the total pressure of the...
- In the given TLC, the distance of spot A & B are 5 cm & 7 cm, from the bottom of TLC plate, respectively. R_f value of B is x ×...
- Based on Heisenberg's uncertainty principle, the uncertainty in the velocity of the electron to be found within an atomic nucleus...
- Total number of electron present in (π*) molecular orbitals of O₂, O₂⁺ and O₂⁻ is ______.
- When ΔH_vap = 30 kJ/mol and ΔS_vap = 75 J mol⁻¹ K⁻¹, then the temperature of vapour, at one atmosphere is ______ K.
- Methods used for purification of organic compounds are based on :
- In which one of the following pairs the central atoms exhibit sp² hybridization ?
- Relative stability of the contributing structures is : (I) CH₂=CH–C(=O)–H (neutral structure) (II) ⁺CH₂–CH=C(H)–O⁻ (III)...
- Given below are two statements : Statement (I) : The oxidation state of an element in a particular compound is the charge...
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : S_N2...
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Both...
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The...
- Compare the energies of following sets of quantum numbers for multielectron system. (A) n = 4, ℓ = 1 (B) n = 4, ℓ = 2 (C) n = 3,...
- On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed ?
- Identify the incorrect statements regarding primary standard of titrimetric analysis A. It should be purely available in dry...
- The heat of solution of anhydrous CuSO₄ and CuSO₄·5H₂O are −70 kJ mol⁻¹ and +12 kJ mol⁻¹ respectively. The heat of hydration of...
- The standard reduction potentials at 298 K for the following half cells are given below : Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O, E°...
- When equal volume of 1M HCl and 1M H₂SO₄ are separately neutralised by excess volume of 1M NaOH solution, x and y kJ of heat is...