If R is the Rydberg constant for hydrogen, then wave-number of the second line in the Lyman series is
Wave no = 1/λ =R[1/n12 -1/n22]=R[1/12 -1/22]=3R/4.(For Lyman series n1=1)
The ratio of specific charge of a proton and an α-particle is
which of the following hybridisation occurs in the formation of methane molecule?
Which of the following has highest molar conductivity?
An aqueous solution of CoCl₂ on addition of excess of concentrated HCl, turns blue due to the formation of
Which of the following exhibit geometrical isomerism?
Nitric oxide is formed in the combustion of fuel. An internal combustion engine produces 600 ppm (600 mg L–1) of NO. 100 L of air containing the produced NO was oxidised to NO2. The NO2 formed was dissolved in 10 L of water. The pH of the resulting solution is (log 2 = 0.30, log 3 = 0.48)
A thin circular-disk earrings 10.0 cm in diameter is plated with a coating of gold 0.20 mm thick from an Au3+ bath. How many days (approx.) does it take to deposit the gold on one side of one earring if the current is 0.193 ampere.
(Au = 197, density of Au = 19.7 g/cm3, 1 F = 96500 C, 86400 = 27500 p)
Consider the following orders given below.
(i) S > Se > Te > O (Electron Affinity)
(ii) N–3 > O2– > F– > Na+ > Mg2+ (Ionic Size)
(iii) Fe2+ > Fe3+ > Fe4+ (Ionization Enthalpy)
(iv) H < B < P < C < Cl (Electronegativity)
(v) Na+ < Mg2+ < Al3+ (Extent of hydration)
(vi) Li > Na > K > Rb > Cs (Reducing Nature)
(vii) LiF(s) > LiCl(s) > LiBr(s) (Lattice Energy)
If x = number of correct orders
y = number of incorrect orders
then the value of (1 + y/x) is.
Among the following oxides
Cr2O3, V2O5, FeO, Mn2O7, ZnO, Cu2O, MnO2, CrO3, NiO
If x = number of basic oxides
y = number of acidic oxides
z = number of amphoteric oxides
then the value of (x + y)/z is
How many hydrogen atom(s) is/are present in precipitate (P)?