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Chemistry

Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron?
(A) \( \mathrm{NO} \) (B) \( \mathrm{N_2} \) (C) \( \mathrm{O_2} \) (D) \( \mathrm{C_2} \) (E) \( \mathrm{B_2} \)
Choose the most appropriate answer from the options given below:

Incorrect statement for Tyndall effect is:

The pair, in which ions are isoelectronic with \( \mathrm{Al^{3+}} \) is:

Leaching of gold with dilute aqueous solution of \( \mathrm{NaCN} \) in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are:

Number of electron deficient molecules among the following \( \mathrm{PH_3} \), \( \mathrm{B_2H_6} \), \( \mathrm{CCl_4} \), \( \mathrm{NH_3} \), \( \mathrm{LiH} \) and \( \mathrm{BCl_3} \) is:

Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?

White precipitate of \( \mathrm{AgCl} \) dissolves in aqueous ammonia solution due to formation of :

Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?

Among the following, which is the strongest oxidizing agent?

The eutrophication of water body results in :

Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?

In the following structures, which one is having staggered conformation with maximum dihedral angle?

The product formed in the following reaction:

The IUPAC name of ethylidene chloride is:

The major product in the reaction is:

The intermediate \( X \), in the reaction:

In the following reaction:

The compounds \( A \) and \( B \) respectively are:

The reaction of with bromine and \( \mathrm{KOH} \) gives \( \mathrm{RNH_2} \) as the end product. Which one of the following is the intermediate product formed in this reaction?

Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because :

Which one of the following is an example of artificial sweetener?

The number of \( \mathrm{N} \) atoms in \( 681 \, \text{g} \) of \( \mathrm{C}_7\mathrm{H}_5\mathrm{N}_3\mathrm{O}_6 \) is \( x \times 10^{21} \). The value of \( x \) is __________.
\( N_A = 6.02 \times 10^{23} \, \text{mol}^{-1} \) (Nearest Integer)

The distance between \( \text{Na}^+ \) and \( \text{Cl}^- \) ions in solid \( \text{NaCl} \) of density \( 43.1 \, \text{g}\,\text{cm}^{-3} \) is __________ \( \times 10^{-10} \, \text{m} \) (Nearest Integer)
(Given : \( N_A = 6.02 \times 10^{23} \, \text{mol}^{-1} \))

The longest wavelength of light that can be used for the ionisation of lithium atom (Li) in its ground state is \( x \times 10^{-8} \, \text{m} \). The value of \( x \) is __________. (Nearest Integer)
(Given : Energy of the electron in the first shell of the hydrogen atom is \( -2.2 \times 10^{-18} \, \text{J} \) ; \( h = 6.63 \times 10^{-34} \, \text{J s} \) and \( c = 3 \times 10^{8} \, \text{m s}^{-1} \))

The standard entropy change for the reaction
\( 4\mathrm{Fe}(s) + 3\mathrm{O}_2(g) \longrightarrow 2\mathrm{Fe}_2\mathrm{O}_3(s) \) is \( -550 \, \text{J K}^{-1} \) at \( 298 \, \text{K} \).
[Given : The standard enthalpy change for the reaction is \( -165 \, \text{kJ mol}^{-1} \).] The temperature in \( \text{K} \) at which the reaction attains equilibrium is __________. (Nearest Integer)

\( 1 \, \text{L} \) aqueous solution of \( \mathrm{H_2SO_4} \) contains \( 0.02 \, \text{m mol} \, \mathrm{H_2SO_4} \) , \( 50\% \) of this solution is diluted with deionized water to give \( 1 \, \text{L} \) solution (A). In solution (A), \( 0.01 \, \text{m mol} \) of \( \mathrm{H_2SO_4} \) are added. Total m mols of \( \mathrm{H_2SO_4} \) in the final solution is __________ \( \times 10^{3} \) \( \text{m mols} \).

The standard free energy change \( (\Delta G^\circ) \) for \( 50\% \) dissociation of \( \mathrm{N_2O_4} \) into \( \mathrm{NO_2} \) at \( 27^\circ \text{C} \) and \( 1 \, \text{atm} \) pressure is \( -x \, \text{J mol}^{-1} \). The value of \( x \) is __________.(Nearest Integer)
[Given : \( R = 8.31 \, \text{J K}^{-1} \text{mol}^{-1} \) , \( \log 1.33 = 0.1239 \) \( \ln 10 = 2.3 \)]

In a cell, the following reactions take place
\( \mathrm{Fe^{2+}} \rightarrow \mathrm{Fe^{3+}} + e^{-} \qquad E^\circ_{\mathrm{Fe^{3+}/Fe^{2+}}} = 0.77 \, \text{V} \)
\( 2\mathrm{I^-} \rightarrow \mathrm{I_2} + 2e^{-} \qquad E^\circ_{\mathrm{I_2/I^-}} = 0.54 \, \text{V} \)
The standard electrode potential for the spontaneous reaction in the cell is \( x \times 10^{-2} \, \text{V} \) \( 298 \, \text{K} \). The value of \( x \) is __________. (Nearest Integer)

For a given chemical reaction
\( \gamma_{1} A + \gamma_{2} B \rightarrow \gamma_{3} C + \gamma_{4} D \)
Concentration of \( C \) changes from \( 10 \, \text{mmol dm}^{-3} \) to \( 20 \, \text{mmol dm}^{-3} \) in \( 10 \, \text{s} \). Rate of appearance of \( D \) is \( 1.5 \) times the rate of disappearance of \( B \) which is twice the rate of disappearance of \( A \). The rate of appearance of \( D \) has been experimentally determined to be \( 9 \, \text{mmol dm}^{-3}\text{s}^{-1} \). Therefore the rate of reaction is __________ \( \text{mmol dm}^{-3}\text{s}^{-1} \). (Nearest Integer)

If \( [\mathrm{Cu(H_2O)_4}]^{2+} \) absorbs a light of wavelength \( 600 \, \text{nm} \) for d-d transition, then the value of octahedral crystal field splitting energy for \( [\mathrm{Cu(H_2O)_6}]^{2+} \) will be __________ \( \times 10^{-21} \, \text{J} \). (Nearest Integer)
[Given : \( h = 6.63 \times 10^{-34} \, \text{J s} \) and \( c = 3.08 \times 10^{8} \, \text{m s}^{-1} \) ]

Number of grams of bromine that will completely react with \( 5.0 \, \text{g} \) of pent-1-ene is __________ \( \times 10^{-2} \, \text{g} \). (Atomic mass of \( \mathrm{Br} = 80 \, \text{g/mol} \)) (Nearest Integer)

JEE Main 2022 25th June Morning Shift

Physics Chemistry Mathematics

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Leaching of gold with dilute aqueous solution of \( \mathrm{NaCN} \) in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are: