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Chemistry

Preparation of potassium permanganate from $ \mathrm{MnO_2} $ involves two step process in which the $ 1^{\text{st}} $ step is a reaction with $ \mathrm{KOH} $ and $ \mathrm{KNO_3} $ to produce:

52.

The product $ (A) $ formed in the following reaction sequence is:

53.

Which one of the carbocations from the following is most stable?

54.

Which of the following statements are NOT true about the periodic table?
(A) The properties of elements are function of atomic weights.
(B) The properties of elements are function of atomic numbers.
(C) Elements having similar outer electronic configurations are arranged in same period.
(D) An element’s location reflects the quantum numbers of the last filled orbital.
(E) The number of elements in a period is same as the number of atomic orbitals available in energy level that is being filled.
Choose the correct answer from the options given below:

55.

Which of the following ions is the strongest oxidizing agent?
(Atomic Number of $ \mathrm{Ce} = 58 $, $ \mathrm{Eu} = 63 $, $ \mathrm{Tb} = 65 $, $ \mathrm{Lu} = 71 $)

56.

The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of:

57.

Consider the given plots of vapour pressure ($ \mathrm{VP} $) vs temperature ($ T/K $). Which amongst the following options is correct graphical representation showing $ \Delta T_f $, depression in the freezing point of a solvent in a solution?

58.

Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the Reaction is spontaneous at boiling point of water. Choose the correct option.

59.

Which of the following statement is true with respect to $ \mathrm{H_2O} $, $ \mathrm{NH_3} $ and $ \mathrm{CH_4} $?
(A) The central atoms of all the molecules are $ sp^3 $ hybridized.
(B) The H–O–H, H–N–H and H–C–H angles in the above molecules are $ 104.5^\circ $, $ 107.5^\circ $ and $ 109.5^\circ $, respectively.
(C) The increasing order of dipole moment is $ \mathrm{CH_4} < \mathrm{NH_3} < \mathrm{H_2O} $.
(D) Both $ \mathrm{H_2O} $ and $ \mathrm{NH_3} $ are Lewis acids and $ \mathrm{CH_4} $ is a Lewis base.
(E) A solution of $ \mathrm{NH_3} $ in $ \mathrm{H_2O} $ is basic. In this solution $ \mathrm{NH_3} $ and $ \mathrm{H_2O} $ act as Lowry-Bronsted acid and base respectively.
Choose the correct answer from the options given below:

60.

Which of the following linear combination of atomic orbitals will lead to formation of molecular orbitals in homonuclear diatomic molecules [internuclear axis in $ z $-direction]?
(A) $ 2p_z $ and $ 2p_x $ (B) $ 2s $ and $ 2p_x $
(C) $ 3d_{xy} $ and $ 3d_{x^2-y^2} $ (D) $ 2s $ and $ 2p_z $
(E) $ 2p_z $ and $ 3d_{x^2-y^2} $
Choose the correct answer from the options given below:

61.

For a reaction, $ \mathrm{N_2O_5(g)} \rightarrow 2\,\mathrm{NO_2(g)} + \tfrac{1}{2}\,\mathrm{O_2(g)} $ in a constant volume container, no products were present initially. The final pressure of the system when $ 50\% $ of reaction gets completed is:

62.

The carbohydrate “Ribose” present in DNA, is:
(A) A pentose sugar (B) present in pyranose from
(C) in “D” configuration (D) a reducing sugar, when free
(E) in $ \alpha $ – anomeric form
Choose the correct answer from the options given below:

63.

Given below are two statements:
Statement I: The conversion proceeds well in the less polar medium.

Statement II: The conversion proceeds well in the more polar medium.

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

64.

Following are the four molecules “P”, “Q”, “R” and “S”. Which one among the four molecules will react with $ \mathrm{H{-}Br_{(aq)}} $ at the fastest rate?

65.

$ K_{sp} $ for $ \mathrm{Cr(OH)_3} $ is $ 1.6 \times 10^{-30} $. What is the molar solubility of this salt in water?

66.

One mole of the octahedral complex compound $ \mathrm{Co(NH_3)_5 Cl_3} $ give $ 3 $ moles of ions on dissolution in water. One mole of the same complex reacts with excess of $ \mathrm{AgNO_3} $ solution to yield two moles of $ \mathrm{AgCl(s)} $. The structure of the complex is:

67.

Aman has been asked to synthesise the molecule $ (x) $. He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing ozonolysis reaction on alkene to produce a dicarbonyl compound followed by aldol reaction to prepare “$ x $”. Predict the suitable alkene that can lead to the formation of “$ x $”.

68.

For the given cell $ \mathrm{Fe^{2+}_{(aq)} + Ag^{+}_{(aq)} \rightarrow Fe^{3+}_{(aq)} + Ag_{(s)}} $
The standard cell potential of the above reaction is:Given:

69.

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

70.

Given below are two statements I and II.
Statement I: Dumas method is used for estimation of “Nitrogen” in an organic compound.
Statement II: Dumas method involves the formation of ammonium sulphate by heating the organic compound with conc $ \mathrm{H_2SO_4} $.
In the light of the above statements, choose the correct answer from the options give below:

71.

$ 37.8 \ \mathrm{g} \ \mathrm{N_2O_5} $ was taken in a $ 1 \ \mathrm{L} $ reaction vessel and allowed to undergo the following reaction at $ 500 \ \mathrm{K} $
$ 2 \ \mathrm{N_2O_5(g)} \rightleftharpoons 2 \ \mathrm{N_2O_4(g)} + \mathrm{O_2(g)} $
The total pressure at equilibrium was found to be $ 18.65 \ \mathrm{bar} $.
Then, $ K_p = \_\_\_\_\_\_\_\_\_\_ \times 10^{-2} $ [nearest integer] Assume $ \mathrm{N_2O_5} $ to behave ideally under these conditions.
Given: $ R = 0.082 \ \mathrm{bar \ L \ mol^{-1} \ K^{-1}} $

72.

$ X $ $ \text{g} $ of benzoic acid on reaction with $ \mathrm{aq\ NaHCO_3} $ released $ \mathrm{CO_2} $ that occupied $ 11.2 \, \text{L} $ volume at STP. $ X $ is ________ $ \text{g} $.

73.

Standard entropies of $ \mathrm{X_2} $, $ \mathrm{Y_2} $ and $ \mathrm{XY_5} $ are $ 70 $, $ 50 $ and $ 110 \; \mathrm{J\,K^{-1}\,mol^{-1}} $ respectively. The temperature in Kelvin at which the reaction
$\frac{1}{2}\text{X}_2 + \frac{5}{2}\text{Y}_2 \rightleftharpoons \text{XY}_5 \quad \Delta\text{H}^\ominus = -35 \text{ kJ mol}^{-1}$

will be at equilibrium is __________ (Nearest integer)

74.

Consider the following reaction occurring in the blast furnace:
$ \mathrm{Fe_3O_4 (s) + 4\,CO (g) \rightarrow 3\,Fe (l) + 4\,CO_2 (g)} $
$ 'x' $ $ \mathrm{kg} $ of iron is produced when $ 2.32 \times 10^{3} \; \mathrm{kg} \; \mathrm{Fe_3O_4} $ and $ 2.8 \times 10^{2} \; \mathrm{kg} \; \mathrm{CO} $ are bought together in the furnace. The value of $ 'x' $ is _______ . (nearest integer)
$ \{ \text{Given: molar mass of } \mathrm{Fe_3O_4} = 232 \; \mathrm{g\,mol^{-1}} \} $
molar mass of $ \mathrm{CO} = 28 \; \mathrm{g\,mol^{-1}} $
molar mass of $ \mathrm{Fe} = 56 \; \mathrm{g\,mol^{-1}} $

75.

Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with $ \mathrm{K_4[Fe(CN)_6]} $ is ________.
$ \mathrm{Cu^{2+},\ Fe^{3+},\ Ba^{2+},\ Ca^{2+},\ NH_4^{+},\ Mg^{2+},\ Zn^{2+}} $

JEE Main 2025 24th Jan Morning Shift

Mathematics Physics Chemistry

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Following are the four molecules “P”, “Q”, “R” and “S”. Which one among the four molecules will react with $ \mathrm{H{-}Br_{(aq)}} $ at the fastest rate?

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JEE Mains | PYQ