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JEE Mains | PYQ

Which one of the following statements is incorrect ?

The deposition of \( X \) and \( Y \) on ground surfaces is referred as wet and dry depositions, respectively. \( X \) and \( Y \) are:

The number of \( \mathrm{S{=}O} \) bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are:

For the following sequence of reactions, the correct products are:

Identify correct A, B and C in the reaction sequence given below:

Which among the following is not a polyester?

The major products A and B formed in the following reaction sequence are:

Arrange the following conformational isomers of n-butane in order of their increasing potential energy:

Match List - I with List - II:

Choose the most appropriate answer from the options given below:

The major product of the following reaction is:

Match List - I with List II :

Choose the most appropriate answer from the options given below

Which of the following is NOT an example of fibrous protein?

Spin only magnetic moment in BM of \( [\mathrm{Fe}(\mathrm{CO})_4(\mathrm{C_2O_4})]^+ \) is:

For the reaction given below:

The compound which is not formed as a product in the reaction is a :

The structures of A and B formed in the following reaction are: \( [\mathrm{Ph} = -\mathrm{C}_6\mathrm{H}_5] \)

The \( \mathrm{Eu^{2+}} \) ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = \( 63 \)]

The incorrect expression among the following is:

Which one of the following correctly represents the order of stability of oxides, \( X_2O \). (\( X \) = halogen)?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Lithium salts are hydrated.
Reason (R): Lithium has higher polarising power than other alkali metal group members.
In the light of the above statements, choose the most appropriate answer from the options given below:

The pH of a solution obtained by mixing \( 50 \, \text{mL} \) of \( 1 \, \text{M} \) HCl and \( 30 \, \text{mL} \) of \( 1 \, \text{M} \) NaOH is \( x \times 10^{-4} \). The value of \( x \) is ________ . (Nearest integer) [\( \log 2.5 = 0.3979 \)]

Sodium oxide reacts with water to produce sodium hydroxide. \( 20.0 \, \text{g} \) of sodium oxide is dissolved in \( 500 \, \text{mL} \) of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is _______ \( \times 10^{-1} \, \text{M} \). (Nearest integer) [Atomic mass: \( \mathrm{Na} = 23.0 \), \( \mathrm{O} = 16.0 \), \( \mathrm{H} = 1.0 \)]

In the electrolytic refining of blister copper, the total number of main impurities, from the following removed as anode mud is ________ . Pb, Sb, Se, Te, Ru, Ag, Au and Pt

For the reaction \( \mathrm{A} \to \mathrm{B} \), the rate constant \( k \) (in \( \text{s}^{-1} \)) is given by \( \log_{10} k = 20.35 - \frac{(2.47 \times 10^{3})}{T} \).
The energy of activation in \( \text{kJ mol}^{-1} \) is ________. (Nearest integer) [Given: \( R = 8.314 \, \text{J K}^{-1}\text{ mol}^{-1} \)]

\( 1.22 \, \text{g} \) of an organic acid is separately dissolved in \( 100 \, \text{g} \) of benzene \( (K_b = 2.6 \, \text{K kg mol}^{-1}) \) and \( 100 \, \text{g} \) of acetone \( (K_b = 1.7 \, \text{K kg mol}^{-1}) \). The acid is known to dimerize in benzene but remain as a monomer in acetone. The boiling point of the solution in acetone increases by \( 0.17 ^\circ \text{C} \). The increase in boiling point of solution in benzene in \( ^\circ \text{C} \) is \( x \times 10^{-2} \). The value of \( x \) is _______. (Nearest integer) (Atomic mass: \( \mathrm{C} = 12.0 \), \( \mathrm{H} = 1.0 \), \( \mathrm{O} = 16.0 \))

\( \mathrm{CH}_4 \) is adsorbed on \( 1 \, \text{g} \) charcoal at \( 0^\circ \text{C} \) following the Freundlich adsorption isotherm. \( 10.0 \, \text{mL} \) of \( \mathrm{CH}_4 \) is adsorbed at \( 100 \, \text{mm} \) of Hg, whereas \( 15.0 \, \text{mL} \) is adsorbed at \( 200 \, \text{mm} \) of Hg. The volume of \( \mathrm{CH}_4 \) adsorbed at \( 300 \, \text{mm} \) of Hg is \( 10^{x} \, \text{mL} \). The value of \( x \) is _______ \( \times 10^{-2} \). (Nearest integer) (Use \( \log_{10} 2 = 0.3010 \), \( \log_{10} 3 = 0.4771 \))

The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in \( \mathrm{A}_x\mathrm{B}_{} \). The value of \( x \) is _______. (Integer answer)

According to molecular orbital theory, the number of unpaired electron(s) \( \mathrm{O}_2^{2-} \) is _______.

The value of magnetic quantum number of the outermost electron of \( \mathrm{Zn}^{+} \) ion is _____ . (Integer answer)

The transformation occurring in the Duma's method is given below
\( \mathrm{C_2H_7N} + \left( 2x + \frac{y}{2} \right)\mathrm{CuO} \rightarrow x\mathrm{CO_2} + \frac{y}{2}\mathrm{H_2O} + \frac{z}{2}\mathrm{N_2} + \left( 2x + \frac{y}{2} \right)\mathrm{Cu} \)
The value of \( y \) is _________ . (Integer answer)