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JEE Mains | PYQ

Which of the following properties will change when system containing solution \( 1 \) will become solution \( 2 \)?

In a reaction \( \mathrm{A} + \mathrm{B} \rightarrow \mathrm{C} \), initial concentrations of \( \mathrm{A} \) and \( \mathrm{B} \) are related as \( [\mathrm{A}]_{0} = 8[\mathrm{B}]_{0} \). The half lives of \( \mathrm{A} \) and \( \mathrm{B} \) are \( 10 \, \text{min} \) and \( 40 \, \text{min} \), respectively. If they start to disappear at the same time, both following first order kinetics, after how much time will the concentration of both the reactants be same?

Identify \( [\mathrm{A}], [\mathrm{B}] \) and \( [\mathrm{C}] \), respectively in the following reaction sequence:

In the following system, \( \mathrm{PCl_5(g)} \rightleftharpoons \mathrm{PCl_3(g)} + \mathrm{Cl_2(g)} \) at equilibrium, upon addition of xenon gas at constant \( T \) and \( P \), the concentration of:

Which of the following is the correct structure of L-Fructose?

The correct order of the complexes \( [\mathrm{Co(NH_3)_5(H_2O)}]^{3+} (A), [\mathrm{Co(NH_3)_6}]^{3+} (B), [\mathrm{Co(CN)_6}]^{3-} (C) \) and \( [\mathrm{CoCl(NH_3)_5}]^{2+} (D) \) in terms of wavelength of light absorbed is:

The metal ions that have the calculated spin-only magnetic moment value of \( 4.9 \, \text{B.M.} \) are:
(A) \( \mathrm{Cr^{2+}} \)
(B) \( \mathrm{Fe^{2+}} \)
(C) \( \mathrm{Fe^{3+}} \)
(D) \( \mathrm{Co^{2+}} \)
(E) \( \mathrm{Mn^{3+}} \)
Choose the correct answer from the options given below:

Match the List-I with List-II:

Choose the correct answer from the options given below:

Which of the following statements are correct?
(A) The process of adding an electron to a neutral gaseous atom is always exothermic
(B) The process of removing an electron from an isolated gaseous atom is always endothermic
(C) The \( 1^{\text{st}} \) ionization energy of boron is less than that of beryllium
(D) The electronegativity of C is \( 2.5 \) in \( \mathrm{CH_4} \) and \( \mathrm{CCl_4} \)
(E) \( \mathrm{Li} \) is the most electropositive among elements of group I
Choose the correct answer from the options given below:

Given below are two statements:
Statement I : A catalyst cannot alter the equilibrium constant \( (K_c) \) of the reaction, temperature remaining constant.
Statement II : A homogenous catalyst can change the equilibrium composition of a system, temperature remaining constant.
In the light of the above statements, choose the correct answer from the options given below:

Number of molecules from below which cannot give iodoform reaction is: Ethanol, Isopropyl alcohol, Bromoacetone, \( 2 \)-Butanol, \( 2 \)-Butanone, Butanal, \( 2 \)-Pentanone, \( 3 \)-pentanone, Pentanal and \( 3 \)-Pentanol.

Which compound would give \( 3 \)-methyl-\( 6 \)-oxoheptanal upon ozonolysis?

The least acidic compound, among the following is:

In the following reactions, which one is NOT correct?

Correct order of limiting molar conductivity for cations in water at \( 298 \, \text{K} \) is:

\( 2 \) moles each of ethylene glycol and glucose are dissolved in \( 500 \, \text{g} \) of water. The boiling point of the resulting solution is: (Given: Ebullioscopic constant of water \( = 0.52 \, \text{K kg mol}^{-1} \))

Given below are two statements:
Statement I : The \( \mathrm{N{-}N} \) single bond is weaker and longer than that of \( \mathrm{P{-}P} \) single bond.
Statement II : Compounds of group \( 15 \) elements in \( +3 \) oxidation states readily undergo disproportionation reactions.
In the light of the above statements, choose the correct answer from the options given below:

Which of the following postulate of Bohr’s model of hydrogen atom is not in agreement with quantum mechanical model of an atom?

Among \( 10^{-9} \,\text{g} \) (each) of the following elements, which one will have the highest number of atoms? Element: \( \text{Pb} \), \( \text{Po} \), \( \text{Pr} \) and \( \text{Pt} \)

\( 0.5 \,\text{g} \) of an organic compound on combustion gave \( 1.46 \,\text{g} \) of \( \text{CO}_2 \) and \( 0.9 \,\text{g} \) of \( \text{H}_2\text{O} \). The percentage of carbon in the compound is __________. (Nearest integer) [Given: Molar mass (in \( \text{g mol}^{-1} \)) \( \text{C} : 12 \) ; \( \text{H} : 1 \) ; \( \text{O} : 16 \)]

Given:
$\Delta\text{H}^\ominus_{\text{sub}[\text{C(graphite)}]} = 710\text{ kJ mol}^{-1}$
$\Delta_{\text{C}-\text{H}}\text{H}^\ominus = 414\text{ kJ mol}^{-1}$
$\Delta_{\text{H}-\text{H}}\text{H}^\ominus = 436\text{ kJ mol}^{-1}$
$\Delta_{\text{C}=\text{C}}\text{H}^\ominus = 611\text{ kJ mol}^{-1}$The$\Delta\text{H}_{\text{f}}^\ominus$ for $\text{CH}_2 = \text{CH}_2$ is ________ $\text{kJ mol}^{-1}$. (Nearest integer value)

During estimation of nitrogen by Dumas’ method of compound \( X \) \( (0.42 \,\text{g}) \)

__________ \( \text{mL} \) of \( \text{N}_2 \) gas will be liberated at STP. (Nearest integer)
(Given molar mass in \( \text{g mol}^{-1} \) : \( \text{C} : 12 \) ; \( \text{H} : 1 \) ; \( \text{N} : 14 \))

Consider the following reactions:

The number of terminal ‘\( \text{O} \)’ present in the compound ‘\( \text{C} \)’ is __________.

The number of optical isomers exhibited by the iron complex \( (A) \) obtained from the following reaction is __________.
\( \mathrm{FeCl_3} + \mathrm{KOH} + \mathrm{H_2C_2O_4} \rightarrow A \)