The shortest wavelength of hydrogen atom in Lyman series is $$\lambda$$. The longest wavelength in 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 hydrogen atom in Lyman series is $$\lambda$$. The longest wavelength in Balmer series of He$$^+$$ is
Login to view the detailed solution.
The bond dissociation energy is highest for
Login to view the detailed solution.
For 1 mol of gas, the plot of pV vs p is shown below. p is the pressure and V is the volume of the gas.
What is the value of compressibility factor at point A?
Login to view the detailed solution.
.webp)
Which of the given compounds can enhance the efficiency of hydrogen storage tank?
Login to view the detailed solution.
The magnetic behaviour of Li$$_2$$O, Na$$_2$$O$$_2$$ and KO$$_2$$, respectively, are
Login to view the detailed solution.
The correct order of hydration enthalpies is
(A) K$$^+$$
(B) Rb$$^+$$
(C) Mg$$^{2+}$$
(D) Cs$$^+$$
(E) Ca$$^{2+}$$
Choose the correct answer from the options below:
Login to view the detailed solution.
.webp)
During the borax bead test with CuSO$$_4$$, a blue green colour of the bead was observed in oxidising flame due to the formation of
Login to view the detailed solution.
Compound that will give positive Lassaigne's test for both nitrogen and halogen is
Login to view the detailed solution.
Correct statement about smog is
Login to view the detailed solution.
.webp)
The standard electrode potential (M$$^{3+}$$/M$$^{2+}$$) for V, Cr, Mn & Co are $$-0.26$$ V, $$-0.41$$ V, $$+1.57$$ V and $$+1.97$$ V, respectively. The metal ions which can liberate H$$_2$$ from a dilute acid are
Login to view the detailed solution.
Following figure shows dependence of molar conductance of two electrolytes on concentration. $$\Lambda^0_m$$ is the limiting molar conductivity.
The number of Incorrect statement(s) from the following is ______
(A) $$\Lambda^0_m$$ for electrolyte A is obtained by extrapolation
(B) For electrolyte B, $$\Lambda_m$$ Vs $$\sqrt{c}$$ graph is a straight line with intercept equal to $$\Lambda^0_m$$
(C) At infinite dilution, the value of degree of dissociation approach zero for electrolyte B.
(D) $$\Lambda_m$$ for any electrolyte A or B can be calculated using $$\lambda°$$ for individual ions.
Login to view the detailed solution.
Which of the following salt solutions would coagulate the colloid solution formed when FeCl$$_3$$ is added to NaOH solution, at the fastest rate?
Login to view the detailed solution.
.webp)
The reaction representing the Mond process for metal refining is ______
Login to view the detailed solution.
"A" obtained by Ostwald's method involving air oxidation of NH$$_3$$, upon further air oxidation produces "B". "B" on hydration forms an oxoacid of Nitrogen along with evolution of "A". The oxoacid also produces "A" and gives positive brown ring test
Login to view the detailed solution.
Chiral complex from the following is:
Here en = ethylene diamine
Login to view the detailed solution.
Identify the correct order for the given property for following compounds
Choose the correct answer from the option below:
The increasing order of pK$$_a$$ for the following phenols is
(A) 2,4-Dinitrophenol
(B) 4-Nitrophenol
(C) 2,4,5-Trimethylphenol
(D) Phenol
(E) 3-Chlorophenol
Choose the correct answer from the option given below:
Login to view the detailed solution.
Match List I with List II.
| List I (Reaction) | List II (Reagents) |
|---|---|
| (A) Hoffmann Degradation | (I) Conc. KOH, $$\Delta$$ |
| (B) Clemmensen reduction | (II) CHCl$$_3$$, NaOH/H$$_3$$O$$^+$$ |
| (C) Cannizzaro reaction | (III) Br$$_2$$, NaOH |
| (D) Reimer-Tiemann reaction | (IV) Zn $$-$$ Hg/HCl |
Login to view the detailed solution.
The major product 'P' for the following sequence of reactions is:
Match List I with List II
| List I (Antimicrobials) | List II (Names) |
|---|---|
| (A) Narrow Spectrum Antibiotic | (I) Furacin |
| (B) Antiseptic | (II) Sulphur dioxide |
| (C) Disinfectants | (III) Penicillin-G |
| (D) Broad spectrum antibiotic | (IV) Chloramphenicol |
Login to view the detailed solution.
Number of cyclic tripeptides formed with 2 amino acids A and B is:
Login to view the detailed solution.
The number of molecules or ions from the following, which do not have odd number of electrons are ______.
(A) NO$$_2$$
(B) ICl$$_4^-$$
(C) BrF$$_3$$
(D) ClO$$_2$$
(E) NO$$_2^+$$
(F) NO
Login to view the detailed solution.
Consider the following reaction approaching equilibrium at $$27°$$C and 1 atm pressure
$$\text{A} + \text{B} \underset{K_r=10^2}{\overset{K_f=10^3}{\rightleftharpoons}} \text{C} + \text{D}$$
The standard Gibb's energy change $$(\Delta_r G°)$$ at $$27°$$C is $$(-)$$ ______ kJ mol$$^{-1}$$. (Nearest integer).
(Given: R $$= 8.3$$ J K$$^{-1}$$ mol$$^{-1}$$ and $$\ln 10 = 2.3$$)
Login to view the detailed solution.
Water decomposes at 2300 K
$$\text{H}_2\text{O}(g) \to \text{H}_2(g) + \frac{1}{2}\text{O}_2(g)$$
The percent of water decomposing at 2300 K and 1 bar is ______ (Nearest integer). Equilibrium constant for the reaction is $$2 \times 10^{-3}$$ at 2300 K
Login to view the detailed solution.
Millimoles of calcium hydroxide required to produce 100 mL of the aqueous solution of pH 12 is $$x \times 10^{-1}$$. The value of $$x$$ is ______ (Nearest integer). Assume complete dissociation.
Login to view the detailed solution.
Following chromatogram was developed by adsorption of compound 'A' on a 6 cm TLC glass plate. Retardation factor of the compound 'A' is ______ $$\times 10^{-1}$$.
Login to view the detailed solution.
17 mg of a hydrocarbon (M.F. C$$_{10}$$H$$_{16}$$) takes up 8.40 mL of the H$$_2$$ gas measured at 0°C and 760 mm of Hg. Ozonolysis of the same hydrocarbon yields
The number of double bond/s present in the hydrocarbon is
Login to view the detailed solution.
Solid Lead nitrate is dissolved in 1 litre of water. The solution was found to boil at $$100.15°$$C. When $$0.2$$ mol of NaCl is added to the resulting solution, it was observed that the solution froze at $$-0.8°$$C. The solutibility product of PbCl$$_2$$ formed is ______ $$\times 10^{-6}$$ at 298 K. (Nearest integer)
Given: K$$_b = 0.5$$ K kg mol$$^{-1}$$ and K$$_f = 1.8$$ kg mol$$^{-1}$$. Assume molality to be equal to molarity in all cases.
Login to view the detailed solution.
For certain chemical reaction X $$\to$$ Y, the rate of formation of product is plotted against the time as shown in the figure. The number of Correct statement/s from the following is ______
(A) Over all order of this reaction is one
(B) Order of this reaction can't be determined
(C) In region-I and III, the reaction is of first and zero order respectively
(D) In region-II, the reaction is of first order
(E) In region-II, the order of reaction is in the range of 0.1 to 0.9.
The sum of bridging carbonyls in W(CO)$$_6$$ and Mn$$_2$$(CO)$$_{10}$$ is ______.
Login to view the detailed solution.
Educational materials for JEE preparation
Share