Chemistry questions
29404 published questions with worked solutions.
- Given below are two statements: Statement I : H_2Se is more acidic than H_2Te Statement II : H_2Se has higher bond enthalpy for...
- In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eights of its...
- The number of species from the following that are involved in sp^3d^2 hybridization is [Co(NH_3)_6]^ 3+ , SF_6, [CrF_6]^ 3- ,...
- A (i) NaOH (ii) H _3 O ^+ B (i) EtOH (ii) H _2 SO _4, C 'A' shows positive Lassaigne's test for N and its molar mass is 121. 'B'...
- Consider the following half cell reaction Cr_2O_7^ 2- (aq) + 6e^- + 14H^+ (aq) 2Cr^ 3+ (aq) + 7H_2O( ) The reaction was conducted...
- The equilibrium constant for decomposition of H_2O(g) H_2(g) + 1 2 O_2(g) ( G^o = 92.34 kJ mol^ -1 ) is 8.0 × 10^ -3 at 2300 K...
- 20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of...
- The energy of an electron in first Bohr orbit of H^- atom is –13.6 eV. The magnitude of energy value of electron in the first...
- The incorrect relationship in the following pairs in relation to ionisation enthalpies is
- Consider the ground state of chromium atom (Z = 24). How many electrons are with Azimuthal quantum number l = 1 and l = 2...
- A toxic compound "A" when reacted with NaCN in aqueous acidic medium yields an edible cooking component and food preservative...
- Given below are two statements : Statement I : Alcohols are formed when alkyl chlorides are treated with aqueous potassium...
- 'X' is the number of electrons in t_ 2g orbitals of the most stable complex ion among [Fe(NH_3)_6]^ 3+ , [FeCl_6]^ 3- ,...
- Given below are two statements: Statement (I): Molal depression constant K_f is given by M_1RT_f S_ fus , where symbols have...
- Half life of zero order reaction A → product is 1 hour, when initial concentration of reactant is 2.0 mol L^ -1 . The time...
- Match List I with List - II. List – I (Separation of): (A) Aniline from aniline-water mixture (B) Glycerol from spent-lye in soap...
- Given below are two statements: Statement (I) : The first ionisation enthalpy of group 14 elements is higher than the...
- The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively:
- Consider the given data: (a) HCl(g) + 10 H_2O(l) HCl.10H_2O, H = -69.01 kJ mol^ -1 (b) HCl(g) + 40 H_2O(l) HCl.40H_2O, H = -72.79...
- Sea water, which can be considered as a 6 molar (6 M) solution of NaCl, has a density of 2 g mL^ -1 . The concentration of...