Chemistry questions
29404 published questions with worked solutions.
- Hydrogen peroxide in its reaction with KIO_4 and NH_2OH respectively, is acting as a
- For the identification of β-naphthol using dye test, it is necessary to use
- For the elementary reaction M → N, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of...
- Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is
- Match each coordination compound in List-I with an appropriate pair of characteristics from List-II and select the correct answer...
- The total number of lone pairs of electrons in N_2O_3 is
- For the octahedral complexes of Fe^ 3+ in SCN^- (thiocyanato-S) and in CN^- ligand environments, the difference between the...
- Among the triatomic molecules/ions, BeCl_2 , N_3^- , N_2O , NO_2^+ , O_3 , SCl_2 , ICl_2^- , I_3^- and XeF_2 , the total number...
- Not considering the electronic spin, the degeneracy of the second excited state (n=3) of H atom is 9, while the degeneracy of the...
- All the energy released from the reaction X Y , _rG^0=-193 kJ mol ^ -1 is used for oxidizing M^+ as M^+ M^ 3+ +2e^-, E^0=-0.25...
- If the freezing point of a 0.01 molal aqueous solution of a cobalt(III) chloride-ammonia complex (which behaves as a strong...
- The correct statement(s) about Cr^ 2+ and Mn^ 3+ is(are) [Atomic numbers of Cr = 24 and Mn = 25]
- Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is (are)Not in JEE Main or NEET syllabus
- Fe^ 3+ is reduced to Fe^ 2+ by using
- If the unit cell of a mineral has cubic close packed (*ccp*) array of oxygen atoms with ***m*** fraction of octahedral holes...Not in JEE Main or NEET syllabus
- Among the complex ions, [Co(NH_2 - CH_2 - CH_2 - NH_2)_2Cl_2]^+ , [CrCl_2(C_2O_4)_2]^ 3- , [Fe(H_2O)_4(OH)_2]^+ ,...
- Three moles of B_2H_6 are completely reacted with methanol. The number of moles of boron containing product formed is
- The molar conductivity of a solution of a weak acid HX (0.01 M) is 10 times smaller than the molar conductivity of a solution of...
- The correct statement(s) regarding, (i) HClO, (ii) HClO_2 , (iii) HClO_3 and (iv) HClO_4 , is(are)
- The pair(s) of ions where BOTH the ions are precipitated upon passing H_2S gas in presence of dilute HCl, is(are)