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JEE Mains | PYQ

The correct increasing order of the ionic radii is:

\( \mathrm{H_2O_2} \) acts as a reducing agent in.

A protein ‘X’ with molecular weight of \( 70{,}000 \, \mathrm{u} \), on hydrolysis gives amino acids. One of these amino acid is:

Identify X, Y and Z in the following reaction. (Equation not balanced):

$ \text{CIO}_{} + \text{NO}_2 \rightarrow \underline{\text{X}} \xrightarrow{\text{H}_2\text{O}} \underline{\text{Y}} + \underline{\text{Z}} $

An organic compound ‘A’ with empirical formula \( \mathrm{C_6H_6O} \) gives sooty flame on burning. Its reaction with bromine solution in low polarity solvent results in high yield of B. B is:

Match items of column I and II.

Match List I with List II.

Which one of the following statements is correct for electrolysis of brine solution?

Choose the correct set of reagents for the following conversion.
trans \( (\mathrm{Ph{-}CH{=}CH{-}CH_3}) \rightarrow \) cis \( (\mathrm{Ph{-}CH{=}CH{-}CH_3}) \)

Adding surfactants in non – polar solvent, the micelles structure will look like:

The correct order of melting points of dichlorobenzenes is:

When \( \mathrm{Cu^{2+}} \) ion is treated with \( \mathrm{KI} \), a white precipitate, \( X \) appears in solution. The solution is titrated with sodium thiosulphate, the compound \( Y \) is formed, \( X \) and \( Y \) respectively are:

Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from \( n = 4 \) to \( n = 2 \) of \( \mathrm{He^+} \) spectrum.

The correct order of basicity of oxides of vanadium is:

Which of the following artificial sweeteners has the highest sweetness value in comparison to cane sugar?

Cobalt chloride when dissolved in water forms pink colored complex $\underline{\text{X}}$ which has octahedral geometry. 

This solution on treating with conc $\text{HCl}$ forms deep blue complex, $\underline{\text{Y}}$ which has a $\underline{\text{Z}}$ geometry. $\text{X}$, $\text{Y}$ and $\text{Z}$, respectively are:

The methods NOT involved in concentration of ore are:
\( (A) \) Liquation \( \quad (B) \) Leaching \( \quad (C) \) Electrolysis \( \quad (D) \) Hydraulic washing \( \quad (E) \) Froth floatation
Choose the correct answer from the options given below:

\( \mathrm{Nd}^{2+} = \_\_\_\_\_ \)

Consider the above reaction and identify the product B.

The logarithm of equilibrium constant for the reaction $\text{Pd}^{2+} + 4\text{Cl}^- \rightleftharpoons \text{PdCl}_4^{2-}$ is $\underline{\hspace{1cm}}$ (Nearest integer).

Given: $\frac{2.303\text{RT}}{\text{F}} = 0.06\text{V}$

$\text{Pd}^{2+}_{(\text{aq})} + 2\text{e}^- \rightleftharpoons \text{Pd(s)} \, \text{E}^\theta = 0.83\text{V}$

$\text{PdCl}_4^{2-}(\text{aq}) + 2\text{e}^- \rightleftharpoons \text{Pd(s)} + 4\text{Cl}^-(\text{aq}) \, \text{E}^\theta = 0.65\text{V}$

The total pressure of a mixture of non-reacting gases \( X(0.6\,\text{g}) \) and \( Y(0.45\,\text{g}) \) in a vessel is \( 740\,\text{mm of Hg} \). The partial pressure of the gas \( X \) is \( \_\_\_\_ \) \( \text{mm of Hg} \). (Nearest Integer)
(Given: molar mass \( X = 20 \) and \( Y = 45\,\text{g mol}^{-1} \))

At \( 27^\circ\text{C} \), a solution containing \( 2.5\,\text{g} \) of solute in \( 250.0\,mL \) of solution exerts an osmotic pressure of \( 400\,\text{Pa} \). The molar mass of solute is \( \_\_\_\_\,\text{g mol}^{-1} \). (Nearest integer)
(Given: \( R = 0.083\,\text{L bar K}^{-1}\text{ mol}^{-1} \))

The oxidation state of phosphorus in hypophosphoric acid is \( +\_\_\_\_ \).

\( A \rightarrow B \)
The rate constants of the above reaction at \( 200 \, \text{K} \) and \( 300 \, \text{K} \) are \( 0.03 \, \text{min}^{-1} \) and \( 0.05 \, \text{min}^{-1} \) respectively.
The activation energy for the reaction is _____ \( \text{J} \)
(Nearest integer)
(Given: \( \ln 10 = 2.3 \)
\( R = 8.3 \, \text{J K}^{-1}\text{mol}^{-1} \)
\( \log 5 = 0.70 \)
\( \log 3 = 0.48 \)
\( \log 2 = 0.30 \) )

On complete combustion, \( 0.492 \, \text{g} \) of an organic compound gave \( 0.792 \, \text{g} \) of \( \text{CO}_{2} \). The \( \% \) of carbon in the organic compound is ______ (Nearest integer).

Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of \( 11.5 \, \text{g} \) of zinc with excess \( \text{HCl} \) is ______ \( \text{L} \) (nearest integer).
(Given: Molar mass of \( \text{Zn} \) is \( 65.4 \, \text{g mol}^{-1} \) and molar volume of \( \text{H}_{2} \) at STP \( = 22.7 \, \text{L} \) )

For reaction: $\text{SO}_2(\text{g}) + \frac{1}{2}\text{O}_2(\text{g}) \rightleftharpoons \text{SO}_3(\text{g})$

$\text{K}_\text{p} = 2 \times 10^{12}$ at $27^\circ\text{C}$ and $1\text{ atm}$ pressure. The $\text{K}_\text{c}$ for the same reaction is$\underline{\hspace{1cm}} \times 10^{13}$. (Nearest integer).

(Given $\text{R} = 0.082\,\text{L atm K}^{-1}\text{mol}^{-1}$)

How many of the transformations given below would result in aromatic amines?

The enthalpy change for the conversion of \( \frac{1}{2}\text{Cl}_{2}(g) \) to \( \text{Cl}^{-}(aq) \) is \( ( - ) \) _____ \( \text{kJ mol}^{-1} \) (nearest integer):
Given: \( \Delta_{\text{dis}} H^{\theta}_{\text{Cl}_{2}(g)} = 240 \, \text{kJ mol}^{-1} \), \( \Delta_{\text{eg}} H^{\theta}_{\text{Cl}(g)} = -350 \, \text{kJ mol}^{-1} \), \( \Delta_{\text{hyd}} H^{\theta}_{\text{Cl}^{-}(g)} = -380 \, \text{kJ mol}^{-1} \)