Chemistry questions
29404 published questions with worked solutions.
- Among H_2S, H_2O, NF_3, NH_3 and CHCl_3, identify the molecule X with lowest dipole moment value. The number of lone pairs of...
- Given below are two statements : Statement-I : C<O<N<F is the correct order in terms of first ionization enthalpy values....
- Which of the following mixture gives a buffer solution with pH=9.25? Given : pK_b(NH_4OH)=4.75
- The energy of first (lowest) Balmer line of H atom is x J. The energy (in J) of second Balmer line of H atom is :
- Identify the correct statements : A. Hydrated salts can be used as primary standard. B. Primary standard should not undergo any...
- [Ni(PPh_3)_2Cl_2] is a paramagnetic complex. Identify the INCORRECT statements about this complex. A. The complex exhibits...
- The compound A, C_8H_8O_2 reacts with acetophenone to form a single product via cross Aldol condensation. The compound A on...
- If the enthalpy of sublimation of Li is 155 kJ mol⁻¹, enthalpy of dissociation of F_2 is 150 kJ mol⁻¹, ionization enthalpy of Li...
- The mass of benzanilide obtained from the benzoylation reaction of 5.8 g of aniline, if yield of product is 82%, is ____ g...
- Consider A k_1 B and C k_2 D are two reactions. If the rate constant (k_1) of the A B reaction can be expressed by the following...
- Which of the following statements regarding the energy of the stationary state is true in the following oneelectron system ?
- The correct trend in the first ionization enthalpies of the elements in the 3rd period of periodic table is:
- In the given electrochemical cell, Ag(s)|AgCl(s)|FeCl_2(aq), FeCl_3(aq)|Pt(s) at 298 K, the cell potential (E_ cell ) will...
- A cup of water at 5^ (system) is placed in a microwave oven and the oven is turned on for one minute during which, the water...
- Given below are two statements : Statement I : [CoBr_4]^ 2- ion will absorb light of lower energy than [CoCl_4]^ 2- ion....
- Given, (A) n=5, m_l=-1 (B) n=3, l=2, m_l=-1, m_s=+ 1 2 The maximum number of electron(s) in an atom that can have the quantum...
- The statements that are incorrect about the nickel(II) complex of dimethylglyoxime are : A. It is red in colour B. It has a high...
- Identify the molecule X with maximum number of lone pairs of electrons (obtained using Lewis dot structure) among HNO_3, H_2SO_4,...
- Given below are two statements : Statement-I : Sublimation is used for the separation and purification of compounds with low...
- The correct statements from the following are : (A) Ionic radii of trivalent cations of group 13 elements decreases down the...