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Chemistry

Which one among the following resonating structures is not correct?

The ionic radii of \( \mathrm{K^+} \), \( \mathrm{Na^+} \), \( \mathrm{Al^{3+}} \) and \( \mathrm{Mg^{2+}} \) are in the order:

is a repeating unit for:

Given below are two statements:
Statement I : None of the alkaline earth metal hydroxides dissolve in alkali.
Statement II : Solubility of alkaline earth metal hydroxides in water increases down the group.
In the light of the above statements, choose the most appropriate answer from the options given below :

At \( 298.2 \, \text{K} \) the relationship between enthalpy of bond dissociation (in \( \text{kJ mol}^{-1} \)) for hydrogen \(( E_{\mathrm{H}} )\) and its isotope, deuterium, \(( E_{\mathrm{D}} )\), is best described by:

The given reaction can occur in the presence of:
(a) Bromine water
(b) \( \mathrm{Br_2} \) in \( \mathrm{CS_2} \), \( 273 \, \text{K} \)
(c) \( \mathrm{Br_2/FeBr_3} \)
(d) \( \mathrm{Br_2} \) in \( \mathrm{CHCl_3} \), \( 273 \, \text{K} \)
Choose the correct answer from the options given below:

Consider the above reaction, the major product ‘P’ is:

The correct order of following \( 3d \) metal oxides, according to their oxidation numbers is:
(a) \( \mathrm{CrO_3} \) (b) \( \mathrm{Fe_2O_3} \) (c) \( \mathrm{MnO_2} \) (d) \( \mathrm{V_2O_5} \) (e) \( \mathrm{Cu_2O} \)

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with \( \mathrm{NaOH} \) is:

Which one of the following chemical agent is not being used for dry-cleaning of clothes?

The water soluble protein is:

Given below are two statements, one is labelled as Assertion (A) and other is labelled as Reason (R).
Assertion (A): Gabriel phthalimide synthesis cannot be used to prepare aromatic primary amines.
Reason (R): Aryl halides do not undergo nucleophilic substitution reaction.
In the light of the above statements, choose the correct answer from the options given below:

An organic compound ‘A’ \( \mathrm{C_4H_8} \) on treatment with \( \mathrm{KMnO_4/H^+} \) yields compound ‘B’ \( \mathrm{C_3H_6O} \). Compound ‘A’ also yields compound ‘B’ on ozonolysis. Compound ‘A’ is:

Sodium stearate \( \mathrm{CH_3(CH_2)_{16}COO^-Na^+} \) is an anionic surfactant which forms micelles in Oil.
Choose the correct statement for it from the following:

Which one of the following compounds of Group-\( 14 \) elements is not known?

Which one of the following compounds will liberate \( \mathrm{CO_2} \) when treated with \( \mathrm{NaHCO_3} \)?

Consider the given reaction, the product ‘X’ is:

Which one of the products of the following reactions does not react with Hinsberg reagent to form sulphonamide?

Which one of the following species responds to an external magnetic field?

For the following graphs,

When \( 10 \, \mathrm{mL} \) of an aqueous solution of \( \mathrm{Fe^{2+}} \) ions was titrated in the presence of dil \( \mathrm{H_2SO_4} \) using diphenylamine indicator, \( 15 \, \mathrm{mL} \) of \( 0.02 \, \mathrm{M} \) solution of \( \mathrm{K_2Cr_2O_7} \) was required to get the end point. The molarity of the solution containing \( \mathrm{Fe^{2+}} \) ions is \( x \times 10^{-2} \, \mathrm{M} \). The value of \( x \) is ________. (Nearest integer)

\( \mathrm{CO_2} \) gas is bubbled through water during a soft drink manufacturing process at \( 298 \; \mathrm{K} \). If \( \mathrm{CO_2} \) exerts a partial pressure of \( 0.835 \; \mathrm{bar} \) then \( x \; \mathrm{m\,mol} \) of \( \mathrm{CO_2} \) would dissolve in \( 0.9 \; \mathrm{L} \) of water. The value of \( x \) is ________. (Nearest integer)
(Henry’s law constant for \( \mathrm{CO_2} \) at \( 298 \; \mathrm{K} \) is \( 1.67 \times 10^{3} \; \mathrm{bar} \))

A home owner uses \( 4.00 \times 10^{3} \; \mathrm{m^{3}} \) of methane \( \mathrm{(CH_4}) \) gas, (assume \( \mathrm{CH_4} \) is an ideal gas) in a year to heat his home. Under the pressure of \( 1.0 \; \mathrm{atm} \) and \( 300 \; \mathrm{K} \), mass of gas used is \( x \times 10^{5} \; \mathrm{g} \). The value of \( x \) is __________. (Nearest integer)
(Given \( R = 0.083 \; \mathrm{L\,atm\,K^{-1}\,mol^{-1}} \))

Consider the complete combustion of butane, the amount of butane utilized to produce \( 72.0 \, \text{g} \) of water is __________ \( \times 10^{-1} \, \text{g} \). (in nearest integer)

At \( 298 \, \text{K} \), the enthalpy of fusion of a solid (X) is \( 2.8 \, \text{kJ mol}^{-1} \) and the enthalpy of vaporization of the liquid (X) is \( 98.2 \, \text{kJ mol}^{-1} \). The enthalpy of sublimation of the substance (X) in \( \text{kJ mol}^{-1} \) is ____________. (in nearest integer)

A source of monochromatic radiation of wavelength \( 400 \, \text{nm} \) provides \( 1000 \, \text{J} \) of energy in \( 10 \) seconds. When this radiation falls on the surface of sodium, \( x \times 10^{20} \) electrons are ejected per second. Assume that wavelength \( 400 \, \text{nm} \) is sufficient for ejection of electron from the surface of sodium metal. The value of \( x \) is ___________. (Nearest integer) \( (h = 6.626 \times 10^{-34} \, \text{J s}) \)

For the reaction \( \mathrm{A + B \rightleftharpoons 2C} \) the value of equilibrium constant is \( 100 \) at \( 298 \, \text{K} \). If the initial concentration of all the three species is \( 1 \, \text{M} \) each, then the equilibrium concentration of \( \mathrm{C} \) is \( x \times 10^{-1} \, \text{M} \). The value of \( x \) is ____________. (Nearest integer)

Consider the cell at \( 25^{\circ}\text{C} \)
\( \mathrm{Zn \; | \; Zn^{2+}(aq),(1M) \; || \; Fe^{3+}(aq), Fe^{2+}(aq) \; | \; Pt(s)} \)
The fraction of total iron present as \( \mathrm{Fe^{3+}} \) ion at the cell potential of \( 1.500 \, \text{V} \) is \( x \times 10^{-2} \). The value of \( x \) is __________. (Nearest integer)
(Given: \( E^{\circ}_{\mathrm{Fe^{3+}/Fe^{2+}}} = 0.77 \, \text{V}, \, E^{\circ}_{\mathrm{Zn^{2+}/Zn}} = -0.76 \, \text{V} \) )

Three moles of \( \mathrm{AgCl} \) get precipitated when one mole of an octahedral co-ordination compound with empirical formula \( \mathrm{CrCl_3 \cdot 3NH_3 \cdot 3H_2O} \) reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is __________.

The number of sigma bonds in is _______________ .

JEE Main 2021 25th July Morning Shift

Physics Chemistry Mathematics

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The ionic radii of \( \mathrm{K^+} \), \( \mathrm{Na^+} \), \( \mathrm{Al^{3+}} \) and \( \mathrm{Mg^{2+}} \) are in the order: