List of top Chemistry Questions

When a crystal of caustic soda is exposed to air, a liquid layer is deposited because:
The pH of a solution is increased from 3 to 6; its H^+ ion concentration will be:
The correct nucleophilicity order is:
A gas X at 1 atm is bubbled through a solution containing a mixture of 1 M Y^- and 1 M Z^+ at 25C. If reduction potential is Z > Y > X, then:
What is the free energy change, Δ G, when 1.0 mole of water at 100C and 1 atm pressure is converted into steam at 100C and 1 atm pressure?
The correct bond order in the following species is:
Among Al₂O₃, SiO₂, P₂O₃ and SO₂ the correct order of acidic strength is:
H₂S gas when passed through a solution containing HCl precipitates cations of second group of qualitative analysis but not those of fourth group. It is because:
A bonded molecule MX₅ is T-shaped. The number of non-bonded pair of electrons is:
The product of atomic weight and specific heat of an element is a constant, approximately 6.4. This law is known as:
1.520 g of hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of the metal is:
The correct order of radii is:
Light of wavelength 180 nm ejects photoelectrons from a metal plate of work function 2 eV. If a magnetic field of 5 × 10⁻³ T is applied parallel to the plate, the radius of the path followed by electrons ejected normally with maximum energy is:
Beryllium and aluminium exhibit similar properties, but the two elements differ in:
If the energy of a photon is 10 eV, its momentum is:
An electromagnetic wave passes through space and its equation is given by E = E₀ sin(ω t - kx). The energy density of the electromagnetic wave in space is:
The IUPAC name for the complex \( [\text{Co(NO}_3)_6\text{NH}_3]^{3+} \) is:
In which of the following octahedral complexes of Co (At no. 27), will the magnitude of \( \Delta_o \) be the highest?
Assertion (A): \( \text{Cu}^{2+} \) and \( \text{Cd}^{2+} \) are separated by first adding KCN solution and then passing H\(_2\)S gas. Reason (R): KCN reduces \( \text{Cu}^{2+} \) to \( \text{Cu}^+ \) and forms a complex with it.
Amongst \( \text{Ni(CO)}_4 \), \( [\text{Ni(CN)}_4]^{2-} \), and \( [\text{NiCl}_4]^{2-} \), which is paramagnetic?
The effective atomic number of cobalt in the complex \( [\text{Co(NH}_3)_6]^{3+} \) is:
The freezing point of a solution composed of 10.0 g of KCl in 100 g of water is 4.5°C. Calculate the van't Hoff factor, \(i\), for this solution.
Which of the following is the correct comparison of the stability of the molecules?
Compound A and B are treated with dil. HCl separately. The gases liberated are Y and Z respectively. Y turns acidified dichromate paper green while Z turns lead acetate paper black. The compound A and B are respectively:
Heat of formation, \( \Delta H_f \), of an explosive compound like NC\( _3 \) is: