Chemistry questions
29404 published questions with worked solutions.
- By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound (X)...
- Consider the following data: _fH^ ( methane, g ) = -X kJ mol^ -1 Enthalpy of sublimation of graphite = Y kJ mol^ -1 Dissociation...
- Decomposition of A is a first order reaction at T(K) and is given by A(g) B(g) + C(g). In a closed 1 L vessel, 1 bar A(g) is...
- Given below are two statements: Statement-I: The correct order in terms of atomic/ionic radii is Al > Mg > Mg^ 2+ > Al^ 3+ ....
- The correct statements are: A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed...Not in JEE Main or NEET syllabus
- The correct order of the rate of the reaction for the following reaction with respect to nucleophiles is: CH_3Br + Nu^ CH_3Nu +...
- Given below are two statements: Statement I: Crystal Field Stabilization Energy (CFSE) of [Cr(H_2O)_6]^ 2+ is greater than that...
- The correct increasing order of C – H(A), C – O(B), C = O(C) and C ≡ N(D) bonds in terms of covalent bond length is:
- Given below are four compounds: (a) n-propyl chloride (b) iso-propyl chloride (c) sec-butyl chloride (d) neo-pentyl chloride...
- Given below are some of the statements about Mn and Mn_2O_7. Identify the correct statements A. Mn forms the oxide Mn_2O_7 in...
- Given below are two statements: Statement I: The correct order in terms of bond dissociation enthalpy is Cl_2 > Br_2 > F_2 > I_2...
- The first and second ionization constants of H_2X are 2.5 10^ -8 and 1.0 10^ -13 respectively. The concentration of X^ 2- in 0.1M...
- The osmotic pressure of a living cell in 12 atm at 300 K. The strength of sodium chloride solution that is isotonic with the...
- A substance 'X' (1.5 g) dissolved in 150 g of a solvent 'Y' (molar mass = 300 g mol^ -1 ) led to an elevation of the boiling...
- Identify the metal ions among Co^ 2+ , Ni^ 2+ , Fe^ 2+ , V^ 3+ and Ti^ 2+ having a spin-only magnetic moment value more than 3.0...
- MX is a sparingly soluble salt that follows the given solubility equilibrium at 298 K MX(s) M^+(aq) + X^-(aq); K_ sp = 10^ -10 If...
- Consider the transition metal ions Mn^ 3+ , Cr^ 3+ , Fe^ 3+ and Co^ 3+ and all form low spin octahedral complexes. The correct...
- Given below are two statements: Statement I: Phenol on treatment with CHCl_3 / aq. KOH under refluxing condition, followed by...
- The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is _____ J...
- A 'p'-block element (E) and hydrogen form a binary cation (EH_x)^+, while EH_3 on treatment with K_2HgI_4 in alkaline medium...