JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Chemistry

The pair from the following pairs having both compounds with net non-zero dipole moment is:

The octahedral diamagnetic low spin complex among the following is:

Given below are two statements:
Statement I: Aqueous solution of \( \mathrm{K}_2\mathrm{Cr}_2\mathrm{O}_7 \) is preferred as a primary standard in volumetric analysis over \( \mathrm{Na}_2\mathrm{Cr}_2\mathrm{O}_7 \) aqueous solution.
Statement II: \( \mathrm{K}_2\mathrm{Cr}_2\mathrm{O}_7 \) has a higher solubility in water than \( \mathrm{Na}_2\mathrm{Cr}_2\mathrm{O}_7 \).
In the light of the above statements, choose the correct answer from the options given below:

34.

Match List I with List II.

List I \| Industry	List II \| Waste Generated
(A) Steel plants	(I) Gypsum
(B) Thermal power plants	(II) Fly ash
(C) Fertilizer industries	(III) Slag
(D) Paper mills	(IV) Bio-degradable wastes

Choose the correct answer from the options given below:

35.

Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to:

36.

Which of the following statements are correct?
(A) The \( \mathrm{M}^{3+} / \mathrm{M}^{2+} \) reduction potential for iron is greater than manganese.
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion
(C) Aqueous solution of \( \mathrm{Cr}^{2+} \) can liberate hydrogen from dilute acid
(D) Magnetic moment of \( \mathrm{V}^{2+} \) is observed between \( 4.4 - 5.2 \) \( \mathrm{BM} \)
Choose the correct answer from the options given below:

37.

The one that does not stabilize \( 2^\circ \) and \( 3^\circ \) structures of proteins is:

38.

Identify the correct order of reactivity for the following pairs towards the respective mechanism.
(A)
(B)
(C) Electrophilic substitution
(D) Nucleophilic substitution
Choose the correct answer from the options given below:

39.

Isomeric amines with molecular formula \( \mathrm{C_8H_{11}N} \) give the following tests
Isomer (P) ⇒ Can be prepared by Gabriel phthalimide synthesis.
Isomer (Q) ⇒ Reacts with Hinsberg’s reagent to give sold insoluble in \( \mathrm{NaOH} \).
Isomer (R) ⇒ Reacts with \( \mathrm{HONO} \) followed by \( \beta \)-naphthol in \( \mathrm{NaOH} \) to give red dye.
Isomers (P), (Q) and (R) respectively are:
P Q R

40.

Lime reacts exothermally with water to give ‘A’ which has low solubility in water. Aqueous solution of ‘A’ is often used for the test of \( \mathrm{CO_2} \), a test in which insoluble B is formed. If B is further reacted with \( \mathrm{CO_2} \) then soluble compound is formed. ‘A’ is:

41.

Suitable reaction condition for preparation of Methyl phenyl ether is:

42.

The major product ‘P’ formed in the given reaction is:

43.

Given:
(A) \( 2\mathrm{CO(g)} + \mathrm{O_2(g)} \rightarrow 2\mathrm{CO_2(g)} \) \( \Delta H_1^{\ominus} = -x \, \text{kJ mol}^{-1} \)
(B) \( \mathrm{C(graphite)} + \mathrm{O_2(g)} \rightarrow \mathrm{CO_2(g)} \) \( \Delta H_2^{\ominus} = -y \, \text{kJ mol}^{-1} \)
The \( \Delta H^{\ominus} \) for the reaction
\( \mathrm{C(graphite)} + \dfrac{1}{2}\mathrm{O_2(g)} \rightarrow \mathrm{CO(g)} \) is:

44.

The number of molecules and moles in \( 2.8375 \) litres of \( \mathrm{O_2} \) at STP are respectively:

45.

Which of the following is used as a stabilizer during the concentration of sulphide ores?

46.

Match List I with List II

List I Polymer	List II Type/Class
(A) Nylon-2-Nylon-6	(I) Thermosetting polymer
(B) Buna-N	(II) Biodegradable polymer
(C) Urea-formaldehyde resin	(III) Synthetic rubber
(D) Dacron	(IV) Polyester

Choose the correct answer from the options given below:

47.

The enthalpy change for the adsorption process and micelle formation respectively are:

48.

Using column chromatography, mixture of two compounds ‘A’ and ‘B’ was separated. ‘A’ eluted first, this indicates ‘B’ has:

49.

Given below are two reactions, involved in the commercial production of dihydrogen \( (\mathrm{H_2}) \).The two reactions are carried out at temperature “\( T_1 \)”, and “\( T_2 \)”, respectively.
\( \mathrm{C(s) + H_2O(g) \xrightarrow{T_1} CO(g) + H_2(g)} \)
\( \mathrm{CO(g) + H_2O(g) \xrightarrow[\text{catalyst}]{T_2} CO_2(g) + H_2(g)} \)
The temperatures \( T_1 \) and \( T_2 \) are correctly related as:

50.

The compound which does not exist is:

51.

In potassium ferrocyanide, there are ______ pairs of electrons in the \( t_{2g} \) set of orbitals.

52.

The sum of lone pairs present on the central atom of the interhalogen \( \mathrm{IF_5} \) and \( \mathrm{IF_7} \) is ______

53.

The number of bent-shaped molecule/s from the following is _________
\( \mathrm{N_3^-} \), \( \mathrm{NO_2^-} \), \( \mathrm{I_3^-} \), \( \mathrm{O_3} \), \( \mathrm{SO_2} \)

54.

A molecule undergoes two independent first order reactions whose respective half lives are \( 12 \, \text{min} \) and \( 3 \, \text{min} \). If both the reactions are occurring then the time taken for the \( 50\% \) consumption of the reactant is _________ min. (Nearest integer)

55.

\( \mathrm{FeO_4^{2-}} \xrightarrow{+2.2\,\mathrm{V}} \mathrm{Fe^{3+}} \xrightarrow{+0.70\,\mathrm{V}} \mathrm{Fe^{2+}} \xrightarrow{-0.45\,\mathrm{V}} \mathrm{Fe^{0}} \)
\( E^{0}_{\mathrm{FeO_4^{2-}/Fe^{2+}}} \) is \( x \times 10^{-3}\,\mathrm{V} \). The value of \( x \) is _________

56.

The number of incorrect statements/s about the black body from the following is _______
(A) Emit or absorb energy in the form of electromagnetic radiation.
(B) Frequency distribution of the emitted radiation depends on temperature.
(C) At a given temperature, intensity vas frequency curve passes trough a maximum value.
(D) The maximum of the intensity vas frequency curve is at a higher frequency at higher temperature compared to that at lower temperature.

57.

In the following reactions, the total number of oxygen atoms in \( X \) and \( Y \) is _________
\( \mathrm{Na_2O} + \mathrm{H_2O} \rightarrow 2X \)
\( \mathrm{Cl_2O_7} + \mathrm{H_2O} \rightarrow 2Y \)

58.

If the degree of dissociations of aqueous solution of weak monobasic acid is determined to be \( 0.3 \), then the observed freezing point will be ______\( \% \) higher tan the expected/theoretical freezing point. (Nearest integer)

59.

At constant temperature, a gas is at a pressure of \( 940.3 \, \text{mm Hg} \). The pressure at which its volume decreases by \( 40\% \) is ________ \( \text{mm Hg} \). (Nearest integer)

60.

The number of correct statement/s involving equilibria in physical processes from the following is __________
(A) Equilibrium is possible only in a closed system at a given temperature.
(B) Both the opposing processes occur at the same rate.
(C) When equilibrium is attained at a given temperature, the value of all its parameters became equal.
(D) For dissolution of solids in liquids, the solubility is constant at a given temperature.

JEE Main 2023 10th April Morning Shift

Physics Chemistry Mathematics

← PreviousQuestion 31 of 90Next →

JEE MainsJEE AdvanceBITSATJEE Mains | PYQ

JEE Mains JEE Advance BITSAT
JEE Mains | PYQ