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Chemistry

Which statements are NOT TRUE about \( \mathrm{X_e O_{2}F_{2}} \)?
A. It has a see-saw shape.
B. Xe has \( 5 \) electron pairs in its valence shell in \( \mathrm{XeO_{2}F_{2}} \).
C. The O-Xe-O bond angle is close to \( 180^{\circ} \).
D. The F-Xe-F bond angle is close to \( 180^{\circ} \).
E. Xe has \( 16 \) valence electrons in \( \mathrm{X_e O_{2}F_{2}} \).
Choose the correct answer from the options given below:

52.

The oxidation state of chromium in the final product formed in the reaction between KI and acidified \( \mathrm{K_{2}Cr_{2}O_{7}} \) solution is:

53.

Given below are two statements:
Statement I: The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of Mg.
Statement II: The ionic radius of \( \mathrm{O}^{2-} \) is larger than that of \( \mathrm{F}^{-} \).
In the light of the above statements, choose the correct answer from the options given below

54.

Identify the INCORRECT statements from the following:
A. Notation \( ^{24}_{12}\mathrm{Mg} \) represents \( 24 \) protons and \( 12 \) neutrons.
B. Wavelength of a radiation of frequency \( 4.5 \times 10^{15} \, \text{s}^{-1} \) is \( 6.7 \times 10^{-8} \, \text{m} \).
C. One radiation has wavelength \( \lambda_1 = 900 \, \text{nm} \) and energy \( = E_1 \); other radiation has wavelength = \( \lambda_2 (300 \, \text{nm}) \) and energy \( = E_2 \). \( E_1 : E_2 = 3 : 1 \).
D. Number of photons of light of wavelength \( 2000 \, \text{pm} \) that provides \( 1 \, \text{J} \) of energy is \( 1.006 \times 10^{16} \).
Choose the correct answer from the options given below:

55.

Which of the following statements are TRUE about Haloform reaction?:
A. Sodium hypochlorite reacts with KI to give KOI.
B. KOI is a reducing agent.
C. \( \alpha , \beta \)–unsaturated methylketone will give iodoform reaction.
D. Isopropyl alcohol will not give iodoform test.
E. Methanoic acid will give positive iodoform test.
Choose the correct answer from the options given below:

56.

Identify the CORRECT set of details from the following:
A. \( [\mathrm{Co}(\mathrm{NH}_3)_6]^{3+} \): Inner orbital complex; \( d^{2}sp^{3} \) hybridized
B. \( \mathrm[{MnCl}_6]^{3-} \): Outer orbital complex; \( sp^{3}d^{2} \) hybridized
C. \( [\mathrm{CoF}_6]^{3-} \): Outer orbital complex; \( d^{2}sp^{3} \) hybridized
D. \( [\mathrm{FeF}_6]^{3-} \): Outer orbital complex; \( sp^{3}d^{2} \) hybridized
E. \( [\mathrm{Ni}(\mathrm{CN})_4]^{2-} \): Inner orbital complex; \( sp^{3} \) hybridized
Choose the correct answer from the options given below:

57.

Given below are two statements:
Statement I: \( (\text{CH}_3)_3 \overset{\oplus}{\text{C}}\) is more stable than \( \overset{\oplus}{\text{C}}H_3 \) as nine hyperconjugation interactions are possible in \( (\text{CH}_3)_3 \overset{\oplus}{\text{C}}\).
Statement II: \( \overset{\oplus}{\text{C}}H_3 \) is less stable than \( (\text{CH}_3)_3 \overset{\oplus}{\text{C}} \) as only three hyperconjugation interactions are possible in \( \overset{\oplus}{\text{C}}H_3\).
In the light of the above statements, choose the correct answer from the options given below:

58.

It is noticed that \( \mathrm{Pb}^{2+} \) is more stable than \( \mathrm{Pb}^{4+} \) but \( \mathrm{Sn}^{2+} \) is less stable than \( \mathrm{Sn}^{4+} \). Observe the following reactions.
\( \mathrm{PbO}_2 + \mathrm{Pb} \rightarrow 2\mathrm{PbO} ; \ \Delta_r G^\circ (1) \)
\( \mathrm{SnO}_2 + \mathrm{Sn} \rightarrow 2\mathrm{SnO} ; \ \Delta_r G^\circ (2) \)
Identify the correct set from the following

59.

Observe the following reactions at \( T(\mathrm{K}) \).
I. \( A \rightarrow \text{products} \).
II. \( 5\,\mathrm{Br^- (aq)} + \mathrm{BrO_3^- (aq)} + 6\,\mathrm{H^+ (aq)} \rightarrow 3\,\mathrm{Br_2 (aq)} + 3\,\mathrm{H_2O (l)} \)

Both the reactions are started at \( 10.00 \) am. The rates of these reactions at \( 10.10 \) am are same. The value of \( -\dfrac{\Delta[\mathrm{Br^-}]}{\Delta t} \) at \( 10.10 \) am is \( 2 \times 10^{-4} \, \mathrm{mol\,L^{-1}\,min^{-1}} \). The concentration of \( A \) at \( 10.10 \) am is \( 10^{-2} \, \mathrm{mol\,L^{-1}} \). What is the first order rate constant (in \( \mathrm{min^{-1}} \)) of reaction I?

60.

In the light of the above statements, choose the correct answer from the options given below:

61.

Consider the above electrochemical cell where a metal electrode (\( M \)) is undergoing redox reaction by forming \( \mathrm{M^+ (M \rightarrow M^+ + e^-)} \). The cation \( \mathrm{M^+} \) is present in two different concentrations \( c_1 \) and \( c_2 \) as shown above. Which of the following statement is correct for generating a positive cell potential?

62.

A student has been given a compound "\( x \)" of molecular formula \( \mathrm{C_6H_7N} \). ‘\( x \)’ is sparingly soluble in water. However, on addition of dilute mineral acid, ‘\( x \)’ becomes soluble in water. ‘\( x \)’ when treated with \( \mathrm{CHCl_3} \) and \( \mathrm{KOH\ (alc)} \), ‘\( y \)’ is produced. ‘\( y \)’ has a specific unpleasant smell. On treatment with benzene sulphonyl chloride, ‘\( x \)’ gives a compound ‘\( z \)’ which is soluble in alkali. The number of different “\( \mathrm{H} \)” atoms present in ‘\( z \)’ is:

63.

Elements \( X \) and \( Y \) belong to Group \( 15 \). The difference between the electronegativity values of ‘\( X \)’ and phosphorus is higher than that of the difference between phosphorus and ‘\( Y \)’. ‘\( X \)’ and ‘\( Y \)’ are respectively

64.

Given above is the concentration vs time plot for a dissociation reaction: \( \mathrm{A} \rightarrow n\mathrm{B} \).
Based on the data of the initial phase of the reaction (initial \( 10 \, \text{min} \)), the value of \( n \) is______.

65.

Iodoform test can differentiate between
A. Methanol and Ethanol
B. \( \mathrm{CH_3COOH} \) and \( \mathrm{CH_3CH_2COOH} \)
C. Cyclohexene and cyclohexanone
D. Diethyl ether and Pentan-\( 3 \)-one
E. Anisole and acetone
Choose the correct answer from the option given below:

66.

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

67.

A mixed ether (\( P \)), when heated with excess of hot concentrated hydrogen iodide produces two different alkyl iodides which when treated with aq. \( \mathrm{NaOH} \) give compound (\( Q \)) and (\( R \)), given yellow precipitate with \( \mathrm{NaOI} \). Identify the mixed ether (\( P \)) :

68.

The work functions of two metals (\( M_A \) and \( M_B )\) are in the \( 1:2 \) ratio. When these metals are exposed to photons of energy \( 6 \, \text{eV} \), the kinetic energy of liberated electrons of \( M_A : M_B \) is in the ratio of \( 2.642 : 1 \). The work function (in eV) of \( M_A \) and \( M_B \) are respectively,

69.

In Carius method \( 0.2425 \, \text{g} \) of an organic compound gave \( 0.5253 \, \text{g} \) silver chloride. The percentage of chlorine in the organic compound is :

70.

Identify \( P \).

71.

Consider the following reaction of benzene.

In compound \( (Q) \), the percentage of oxygen is _____ \( \% \). \( \)(Nearest integer\( \))

72.

Two liquids \( A \) and \( B \) form an ideal solution. At \( 320 \, \text{K} \), the vapour pressure of the solution, containing \( 3 \) mol of \( A \) and \( 1 \) mol of \( B \) is \( 500 \, \text{mm Hg} \). At the same temperature, if \( 1 \) mol of \( A \) is further added to this solution, vapour pressure of the solution increases by \( 20 \, \text{mm Hg} \). Vapour pressure \( \)(in mm Hg\( \)) of \( B \) in pure state is _________ \( \). \( \)(Nearest integer\( \))

73.

\( X_2(g) + Y_2(g) \rightleftharpoons 2Z(g) \)
\( X_2(g) \) and \( Y_2(g) \) are added to a \( 1 \, \text{L} \) flask and it is found that the system attains the above equilibrium at \( T(K) \) with the number of moles of \( X_2(g) \), \( Y_2(g) \) and \( Z(g) \) being \( 3 \), \( 3 \) and \( 9 \) mole respectively \( \)(equilibrium moles\( \)). Under this condition of equilibrium, \( 10 \) mol of \( Z(g) \) is added to the flask and the temperature is maintained at \( T(K) \). Then the number of moles of \( Z(g) \) in the flask when the new equilibrium is established is _______. \( \)(Nearest integer\( \))

74.

\( 200 \, \text{cc} \) of \( x \times 10^{-3} \, \text{M} \) potassium dichromate is required to oxidise \( 750 \, \text{cc} \) of \( 0.6 \, \text{M} \) Mohr’s salt solution in acidic medium. Here \( x = \) __________.

75.

Total number of unpaired electrons present in the central metal atom/ions of \( \text{Ni(CO)}_4 \), \( [\text{NiCl}_4]^{2-} \), \( \text{PtCl}_2(\text{NH}_3)_2 \), \( [\text{Ni(CN)}_4]^{2-} \) and \( [\text{Pt(CN)}_4]^{2-} \) is __________.

JEE Main 2026 23rd Jan Evening Shift

Mathematics Physics Chemistry

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Consider the following reaction of benzene.

In compound \( (Q) \), the percentage of oxygen is _____ \( \% \). \( \)(Nearest integer\( \))

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JEE Mains | PYQ