The shortest wavelength of H atom in the Lyman series is $$\lambda_1$$. The longest wavelength in the Balmer series of He$$^+$$ is:
JEE WhatsApp Group
Sign in
Please select an account to continue using cracku.in
↓ →
JEE WhatsApp Group
Join Our JEE Preparation Group
Prep with like-minded aspirants; Get access to free daily tests and study material.
The shortest wavelength of H atom in the Lyman series is $$\lambda_1$$. The longest wavelength in the Balmer series of He$$^+$$ is:
Login to view the detailed solution.
The process that is NOT endothermic in nature is:
Login to view the detailed solution.
The reaction in which the hybridisation of the underlined atom is affected is
Login to view the detailed solution.
.webp)
The molecule in which hybrid MOs involve only one d-orbital of the central atom is:
Login to view the detailed solution.
Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is:
Login to view the detailed solution.
If the equilibrium constant for $$A \rightleftharpoons B + C$$ is $$K_{eq}^{(1)}$$ and that of $$B + C \rightleftharpoons P$$ is $$K_{eq}^{(2)}$$, the equilibrium constant for $$A \rightleftharpoons P$$ is:
Login to view the detailed solution.
.webp)
An alkaline earth metal 'M' readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. M is
Login to view the detailed solution.
Which of the following compounds will form the precipitate with aq. AgNO$$_3$$ solution most readily?
Among the following compounds, which one has the shortest C-Cl bond?
Login to view the detailed solution.
.webp)
The processes of calcination and roasting in metallurgical industries, respectively, can lead to:
Login to view the detailed solution.
250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO$$_3$$ and 0.1 M AuCl. The solution was electrolyzed at 2 V by passing a current of 1 A for 15 minutes. The metal/metals electrodeposited will be: $$\left(E^0_{Ag^+/Ag} = 0.80V, E^0_{Au^+/Au} = 1.69V\right)$$
Login to view the detailed solution.
A sample of red ink (a colloidal suspension) is prepared by mixing eosine dye, egg white, HCHO and water. The component which ensures stability of the ink sample is:
Login to view the detailed solution.
.webp)
The incorrect statement(s) among (a) - (c) is (are):
(a) W(VI) is more stable than Cr(VI).
(b) in the presence of HCl, permanganate titrations provide satisfactory results.
(c) some lanthanoid oxides can be used as phosphors.
Login to view the detailed solution.
The Crystal Field Stabilization Energy (CFSE) of $$[CoF_3(H_2O)_3]$$ $$(\Delta_0 < P)$$ is:
Login to view the detailed solution.
The one that can exhibit highest paramagnetic behaviour among the following is: gly = glycinato; bpy = 2, 2'-bipyridine
Login to view the detailed solution.
The major product [B] in the following reaction is:
Login to view the detailed solution.
The major product [R] in the following sequence of reaction is:
The major product [C] of the following reaction sequence will be:
In the following reaction sequence, [C] is:
Login to view the detailed solution.
The mechanism of action of "Terfenadine" (Seldane) is:
Login to view the detailed solution.
A 100 mL solution was made by adding 1.43 g of $$Na_2CO_3 \cdot xH_2O$$. The normality of the solution is 0.1 N. The value of x is __________ (The atomic mass of Na is 23 g/mol)
Login to view the detailed solution.
Consider the following equations:
$$2Fe^{2+} + H_2O_2 \to xA + yB$$ (in basic medium)
$$2MnO_4^- + 6H^+ + 5H_2O_2 \to x'C + y'D + z'E$$ (in acidic medium)
The sum of the stoichiometric coefficients x, y, x', y' and z' for products A, B, C, D and E respectively, is
Login to view the detailed solution.
The osmotic pressure of a solution of NaCl is 0.10 atm and that of a glucose solution is 0.20 atm. The osmotic pressure of a solution formed by mixing 1 L of the sodium chloride solution with 2 L of the glucose solution is $$x \times 10^{-3}$$ atm. x is __________ (nearest integer)
Login to view the detailed solution.
The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature from 27°C to 42°C. Its energy of activation in J/mol is __________ (Take ln 5 = 1.6094; R = 8.314 J mol$$^{-1}$$)
Login to view the detailed solution.
The number of chiral centres present in threonine is __________
Login to view the detailed solution.
Educational materials for JEE preparation