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JEE Mains | PYQ

Match List I with List II:

Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Hydrogen is an environment friendly fuel.
Reason R: Atomic number of hydrogen is \( 1 \) and It is a very light element.
In the light of the above statements, choose the correct answer from the options given below:

In the following reaction, ‘A’ is:

Resonance in carbonate ion \( \mathrm({CO_3^{2-}} \)) is :

Which of the follwing is true?

Match List I with List II.

Choose the correct answer from the options given below:

Match List I with List II.

Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.
Reason R: CO tends to get decomposed at higher temperature.
In the light of the above statements, choose the correct answer from the options given below:

The correct representation in six membered pyranose form for the following sugar \([X]\) is

Sugar \([X]\):

How can photochemical smog be controlled?

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Amongst He, Ne, Ar and Kr. \( 1 \,\mathrm{g} \) of activated charcoal adsorbs more of Kr.
Reason R: The critical volume \( V_c \left( \mathrm{cm^3 \, mol^{-1}} \right) \) and critical pressure \( P_c \) \( \left( \mathrm{atm} \right) \) is highest for Krypton but the compressibility factor at critical point \( Z_c \) is lowest for Krypton.
In the light of the above statements, choose the correct answer from the options given below:

Highest oxidation state of Mn is exhibited in \( \mathrm{Mn_2O_7} \). The correct statements about \( \mathrm{Mn_2O_7} \) are
(A) Mn is tetrahedrally surrounded by oxygen atoms
(B) Mn is octahedrally surrounded by oxygen atoms
(C) Contains Mn-O-Mn bridge
(D) Contains Mn-Mn bond
Choose the correct answer from the option given below:

Which of the following represents the lattice structures of \( A_{0.95}O \) containing \( A^{2+} \), \( A^{3+} \) and \( O^{2-} \) ions?

Which of the following are the example of double salt?
A. \( \mathrm{FeSO_4\cdot (NH_4)_2 SO_4\cdot 6H_2O} \)
B. \( \mathrm{CuSO_4\cdot 4NH_3\cdot H_2O} \)
C. \( \mathrm{K_2SO_4\cdot Al_2(SO_4)_3\cdot 24H_2O} \)
D. \( \mathrm{Fe(CN)_2\cdot 4KCN} \)
Choose the correct answer:

Choose the correct statement(s).
A. Beryllium oxide is purely acidic in nature.
B. Beryllium carbonate is kept in the atmosphere of \( CO_2 \)
C. Beryllium sulphate is readily soluble in water.
D. Beryllium shows anomalous behavior.
Choose the correct answer from the options given below:

Given below are two statements:
Statement I: Chlorine can easily combine with oxygen to form oxides: and the product has a tendency to explode.
Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens.
In the light of the above statements, choose the correct answer from the options given below

A solution of \( \mathrm{FeCl_3} \) when treated with \( \mathrm{K_4[ Fe(CN)_6 ]} \) gives a prussian blue precipitate due to the formation of:

But-\( 2 \)-yne is reacted separately with one mole of Hydrogen as shown below:

A. A is more soluble than B
B. The boiling point and melting point of A are higher and lower than B respectively.
C. A is more polar than B because dipole moment of A is zero.
D. \( Br_2 \) adds easily to B than A
Identify the incorrect statements from the options given below:

Which of the following complex will show largest splitting of \( d \)-orbitals?

Identify the incorrect option from the following:

Number of isomeric compounds with molecular formula \( \mathrm{C}_9\mathrm{H}_{10}\mathrm{O} \) which (i) do not dissolve in \( \mathrm{NaOH} \) (ii) do not dissolve in \( \mathrm{HCl} \). (iii) do not give orange precipitate with \( 2,4\text{-DNP} \) (iv) on hydrogenation give identical compound with molecular formula \( \mathrm{C}_9\mathrm{H}_{12}\mathrm{O} \) is _________.

\( 25 \, \mathrm{mL} \) of an aqueous solution of \( \mathrm{KCl} \) was found to require \( 20 \, \mathrm{mL} \) of \( 1 \, \mathrm{M} \) \( \mathrm{AgNO}_3 \) solution when titrated using \( \mathrm{K}_2\mathrm{CrO}_4 \) as an indicator. What is the depression in freezing point of \( \mathrm{KCl} \) solution of the given concentration? ______ (Nearest integer).
(Given: \( K_f = 2.0 \, \mathrm{K\, kg\, mol^{-1}} \) )
Assume \( (1) \) \( 100\% \) ionization and \( (2) \) density of the aqueous solution as \( 1 \, \mathrm{g\, mL^{-1}} \)

Electrons in a cathode ray tube have been emitted with a velocity of \( 1000 \, \mathrm{m\, s^{-1}} \). The number of following statements which is/are true about the emitted radiation is _________.
Given: \( h = 6 \times 10^{-34} \, \mathrm{J\, s} \), \( m_e = 9 \times 10^{-31} \, \mathrm{kg} \)
\( (\mathrm{A}) \) The deBroglie wavelength of the electron emitted is \( 666.67 \, \mathrm{nm} \).
\( (\mathrm{B}) \) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube.
\( (\mathrm{C}) \) The cathode rays start from cathode and move towards anode.
\( (\mathrm{D}) \) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube.

The total number of chiral compound/s from the following is _________.

At what pH, given half cell \( \mathrm{MnO_4^-} \) \( (0.1\,\mathrm{M}) \) | \( \mathrm{Mn^{2+}} \) \( (0.001\,\mathrm{M}) \) will have electrode potential of \( 1.282\,\mathrm{V} \)? ______. (Nearest Integer)
Given \( E^\circ_{\mathrm{MnO_4/Mn^{2+}}} = 1.54\,\mathrm{V} \), \( \frac{2.303RT}{F} = 0.059\,\mathrm{V} \)

Sum of oxidation state \( P \) of bromine in bromic acid and perbromic acid is:

A and B are two substances undergoing radioactive decay in a container. The half life of A is \( 15\,\mathrm{min} \) and that of B is \( 5\,\mathrm{min} \). If the initial concentration of B is \( 4 \) times that of A and they both start decaying at the same time, how much time will it take for the concentration of both of them to be same? ______ \( \mathrm{min} \).

(i) \( X(g) \rightleftharpoons Y(g) + Z(g) \) \( \quad K_{p1} = 3 \)
(ii) \( A(g) \rightleftharpoons 2B(g) \) \( \quad K_{p2} = 1 \)
If the degree of dissociation and initial concentration of both the reactants \( X(g) \) and \( A(g) \) are equal, then the ratio of the total pressure at equilibrium \( \left(\frac{p_1}{p_2}\right) \) is equal to \( x:1 \). The value of \( x \) is ________. (Nearest integer)

At \( 25^\circ\mathrm{C} \), the enthalpy of the following processes are given:

\( \mathrm{H_2(g) + O_2(g) \rightarrow 2OH(g)} \quad \Delta H^\circ = 78\,\mathrm{kJ\,mol^{-1}} \)
\( \mathrm{H_2(g) + \tfrac{1}{2}O_2(g) \rightarrow H_2O(g)} \quad \Delta H^\circ = -242\,\mathrm{kJ\,mol^{-1}} \)
\( \mathrm{H_2(g) \rightarrow 2H(g)} \quad \Delta H^\circ = 436\,\mathrm{kJ\,mol^{-1}} \)
\( \mathrm{\tfrac{1}{2}O_2(g) \rightarrow O(g)} \quad \Delta H^\circ = 249\,\mathrm{kJ\,mol^{-1}} \)

What would be the value of \( X \) for the following reaction?________. (Nearest integer)
\( \mathrm{H_2O(g) \rightarrow H(g) + OH(g)} \quad \Delta H^\circ = X\,\mathrm{kJ\,mol^{-1}} \)

The density of \( 3 \, \text{M} \) solution of \( \text{NaCl} \) is \( 1.0 \, \text{g} \, \text{mL}^{-1} \). Molality of the solution is ______ \( \times 10^{-2} \, \text{m} \). (Nearest integer).
Given : Molar mass of \( \text{Na} \) and \( \text{Cl} \) is \( 23 \) and \( 35.5 \, \text{g} \, \text{mol}^{-1} \) respectively.