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Chemistry

A solution is \( 0.1 \, \mathrm{M} \, \mathrm{Cl^-} \) and \( 0.001 \, \mathrm{M} \,\text{in} \, \mathrm{CrO_4^{2-}} \). Solid \( \mathrm{AgNO_3} \) is gradually added to it. Assuming that the addition does not change in volume and \( K_{sp}(\mathrm{AgCl}) = 1.7 \times 10^{-10} \, \mathrm{M^2} \) and \( K_{sp}(\mathrm{Ag_2CrO_4}) = 1.9 \times 10^{-12} \, \mathrm{M^3} \). Select correct statement from the following:

The correct order of their reactivity towards hydrolysis at room temperature is:

The major product \( (P) \) in the following reaction is:

Which one of the following species doesn’t have a magnetic moment of \( 1.73 \, \mathrm{BM} \), (spin only value)?

In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of:

Consider the above reaction, compound B is:

Bakelite is a cross-linked polymer of formaldehyde and:

Spin only magnetic moment of an octahedral complex of \( \mathrm{Fe^{2+}} \) in the presence of a strong field ligand in \( \text{BM} \) is:

Which one of the following statements is not true about enzymes?

In the above reactions, product A and product B respectively are:

\( \mathrm{Cu^{2+}} \) salt reacts with potassium iodide to give:

The single largest industrial application of dihydrogen is:

Major product P of above reaction, is:

Which one of the following gases is reported to retard photosynthesis?

The hybridizations of the atomic orbitals of nitrogen in \( \mathrm{NO_2^-} \), \( \mathrm{NO_2^+} \) and \( \mathrm{NH_4^+} \) respectively are:

Outermost electronic configuration of a group \( 13 \) element, \( E \), is \( 4s^2, 4p^1 \). The electronic configuration of an element of p-block period-five placed diagonally to element, \( E \) is:

Consider two chemical reactions \( (A) \) and \( (B) \) that take place during metallurgical process:
\( (A)\displaystyle \text{ZnCO}_{3\text{ (s)}} \xrightarrow{\Delta} \text{ZnO}_{\text{ (s)}} + \text{CO}_{2\text{ (g)}}\)
\( (B)\displaystyle 2\text{ZnS}_{\text{ (s)}} + 3\text{O}_{2\text{ (g)}} \xrightarrow{\Delta} 2\text{ZnO}_{\text{ (s)}} + 2\text{SO}_{2\text{ (g)}} \)
The correct option of names given to them respectively is:

Which one of the following pairs of isomers is an example of metamerism?

Metallic sodium does not react normally with:

Benzene on nitration gives nitrobenzene in presence of \( \mathrm{HNO_3} \) and \( \mathrm{H_2SO_4} \) mixture, where:

For a given chemical reaction \( A \rightarrow B \) at \( 300 \, \text{K} \) the free energy change is \( -49.4 \, \text{kJ mol}^{-1} \) and the enthalpy of reaction is \( 51.4 \, \text{kJ mol}^{-1} \). The entropy change of the reaction is __________ \( \text{J K}^{-1} \text{ mol}^{-1} \).

\( 4 \, \text{g} \) equimolar mixture of \( \mathrm{NaOH} \) and \( \mathrm{Na_2CO_3} \) contains \( x \, \text{g} \) of \( \mathrm{NaOH} \) and \( y \, \text{g} \) of \( \mathrm{Na_2CO_3} \). The value of \( x \) is _____ \( \text{g} \). (Nearest integer)

The wavelength of electrons accelerated from rest through a potential difference of \( 40 \, \text{kV} \) is \( x \times 10^{-12} \, \text{m} \). The value of \( x \) is ____________. (Nearest integer)
Given: Mass of electron \( = 9.1 \times 10^{-31} \, \text{kg} \)
Charge on an electron \( = 1.6 \times 10^{-19} \, \text{C} \)
Plank’s constant \( = 6.63 \times 10^{-34} \, \text{Js} \)

The vapour pressure of \( A \) and \( B \) at \( 25^\circ \text{C} \) are \( 90 \, \text{mm Hg} \) and \( 15 \, \text{mm Hg} \) respectively. If \( A \) and \( B \) are mixed such that the mole fraction of \( A \) in the mixture is \( 0.6 \), then the mole fraction of \( B \) in the vapour phase is \( x \times 10^{-1} \). The value of \( x \) is __________. (Nearest integer)

An aqueous solution of \( \text{NiCl}_2 \) was heated with excess sodium cyanide in presence of strong oxidizing agent to form \( [\text{Ni}(\text{CN})_6]^{2-} \). The total change in number of unpaired electrons on metal centre is ________.

\( \text{PCl}_5(g) \rightarrow \text{PCl}_3(g) + \text{Cl}_2(g) \)
In the above first order reaction the concentration of \( \text{PCl}_5 \) reduces from initial concentration \( 50 \, \text{mol L}^{-1} \) to \( 10 \, \text{mol L}^{-1} \) in \( 120 \) minutes at \( 300 \, \text{K} \). The rate constant for the reaction at \( 300 \, \text{K} \) is \( x \times 10^{-2} \, \text{min}^{-1} \). The value of \( x \) is __________ . [Given \( \log 5 = 0.6989 \) ]

When \( 0.15 \, \text{g} \) of an organic compound was analyzed using Carius method for estimation of bromine, \( 0.2397 \, \text{g} \) of \( \text{AgBr} \) was obtained. The percentage of bromine in the organic compound is ________ . (Nearest integer) [Atomic mass : Silver \( = 108 \), Bromine \( = 80 \)]

Potassium chlorate is prepared by electrolysis of \( \text{KCl} \) in basic solution as shown by following equation.
\( 6\text{OH}^- + \text{Cl}^- \rightarrow \text{ClO}_3^- + 3\text{H}_2\text{O} + 6e^- \)
A current of \( x \, \text{A} \) has to be passed for \( 10 \, \text{h} \) to produce \( 10.0 \, \text{g} \) of potassium chlorate. The value of \( x \) is ________ . (Nearest integer)
(Molar mass of \( \text{KClO}_3 = 122.6 \, \text{g mol}^{-1} \), \( F = 96500 \, \text{C} \) )

Diamond has a three dimensional structure of \( \text{C} \) atoms formed by covalent bonds. The structure of diamond has face centred cubic lattice where \( 50\% \) of the tetrahedral voids are also occupied by carbon atoms. The number of carbon atoms present per unit cell of diamond is ________ .

\( 100 \, \text{ml} \) of \( 0.0018\% \) (w/v) solution of \( \text{Cl}^- \) ion was the minimum concentration of \( \text{Cl}^- \) required to precipitate a negative sol in one \( \text{h} \). The coagulating value of \( \text{Cl}^- \) ion is ___________. (Nearest integer)

JEE Main 2021 20th July Evening Shift

Physics Chemistry Mathematics

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The hybridizations of the atomic orbitals of nitrogen in \( \mathrm{NO_2^-} \), \( \mathrm{NO_2^+} \) and \( \mathrm{NH_4^+} \) respectively are: