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Chemistry

The total number of stereoisomers for the complex \( \mathrm{[Cr(ox)_2ClBr]^{3-}} \) (where \( \text{ox} = \text{oxalate} \)) is:

32.

The correct group of halide ions which can be oxidised by oxygen in acidic medium is:

33.

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is:

34.

In the wet tests for detection of various cations by precipitation, \( \mathrm{Ba^{2+}} \) cations are detected by obtaining precipitate of:

35.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect.
Reason R: The light scatters in all directions when the size of particles is large enough.
In the light of the above statements, choose the correct answer from the options given below:

36.

The covalency and oxidation state respectively of boron in \( \mathrm{[BF_4]^{-}} \), are:

37.

Match List I with List II

List I	List II
A. Weak intermolecular forces of attraction	I. Hexamethylenediamine + adipic acid
B. Hydrogen bonding	II. \( \mathrm{AlEt}_3 + \mathrm{TiCl}_4 \)
C. Heavily branched polymer	III. \( 2 \)-chloro-\( 1,3 \)-butadiene
D. High density polymer	IV. Phenol + formaldehyde

Choose the correct answer from the options given below :

38.

Which of the following complexes will exhibit maximum attraction to an applied magnetic field?

39.

Better method for preparation of \( \mathrm{BeF}_2 \), among the following is :

40.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Isotopes of hydrogen have almost same chemical properties, but difference in their rates of reaction.
Reason R : Isotopes of hydrogen have different enthalpy of bond dissociation.
In the light of the above statements, choose the most appropriate answer from the options given below :

41.

Match List I with List II.
\( 1 \)-Bromopropane is reacted with reagents in List I to give product in List II.

List I	List II
A. KOH (alc.)	I. Nitrile
B. KCN (alc.)	II. Ester
C. \( \mathrm{AgNO}_2 \)	III. Alkene
D. \( \mathrm{H}_3\mathrm{CCOOAg} \)	IV. Nitroalkane

Choose the correct answer from the options given below :

42.

Compound A from the following reaction sequence is :

43.

The major product for the following reaction is :

44.

Identify the correct order of standard enthalpy of formation of sodium halides.

45.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Order of acidic nature of the following compounds is \( A > B > C \).

Reason R : Fluoro is a stronger electron withdrawing group than Chloro group.
In the light of the above statements, choose the correct answer from the options given below :

46.

Given below are two statements related to Ellingham diagram :
Statement I : Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals.
Statement II : It consists of plots of \( \Delta_{\mathrm{f}} H^{0} \) vs \( T \) formation of oxides of elements.
In the light of the above statements, choose the most appropriate answer from the options given below :

47.

Which of the following are the Green house gases ?
A. Water vapour
B. Ozone
C. \( \mathrm{I_2} \)
D. Molecular hydrogen
Choose the most appropriate answer from the options given below :

48.

Given below are two statements :
Statement I : Tropolone is an aromatic compound and has \( 8\pi \) electrons.
Statement II : \( \pi \) electrons of \( >\!C=O \) group in tropolone is involved in aromaticity.
In the light of the above statements, choose the correct answer from the options given below :

49.

Given below are two statements:
Statement I : \( \mathrm{SO_2} \) and \( \mathrm{H_2O} \) both possess V-shaped structure.
Statement II : The bond angle of \( \mathrm{SO_2} \) is less than that of \( \mathrm{H_2O} \).
In the light of the above statements, choose the most appropriate answer from the options given below:

50.

What happens when methane undergoes combustion in systems A and B respectively?

51.

If the formula of borax is \( \mathrm{Na_2B_4O_x(OH)_y \cdot zH_2O} \), then \( x + y + z = \) _________.

52.

\( \mathrm{A(g)} \rightarrow 2\mathrm{B(g)} + \mathrm{C(g)} \) is a first order reaction. The initial pressure of the system was found to be \( 800 \, \text{mm Hg} \) which increased to \( 1600 \, \text{mm Hg} \) after \( 10 \, \text{min} \). The total pressure of the system after \( 30 \, \text{min} \) will be __________ mm Hg. (Nearest integer)

53.

Sodium metal crystallizes in a body centred cubic lattice with unit cell edge length of \( 4 \, \mathring{\text{A}}\). The radius of sodium atom is ________ \( 10^{-1} \, \mathring{\text{A}} \) (Nearest integer)

54.

Sea water contains \( 29.25\% \) \( \mathrm{NaCl} \) and \( 19\% \) \( \mathrm{MgCl_2} \) by weight of solution. The normal boiling point of the sea water is ________ \( ^\circ\mathrm{C} \) (Nearest integer)
Assume \( 100\% \) ionization for both \( \mathrm{NaCl} \) and \( \mathrm{MgCl_2} \)
Given : \( K_b(\mathrm{H_2O}) = 0.52 \, \mathrm{K\,kg\,mol^{-1}} \)
Molar mass of \( \mathrm{NaCl} \) and \( \mathrm{MgCl_2} \) is \( 58.5 \) and \( 95 \, \mathrm{g\,mol^{-1}} \) respectively.

55.

See the following chemical reaction:
\( \mathrm{Cr_2O_7^{2-}} + X\mathrm{H^+} + 6\mathrm{F_e^{2+}} \rightarrow Y\mathrm{Cr^{3+}} + 6\mathrm{F_e^{3+}} + Z\mathrm{H_2O} \)
The sum of \( X \), \( Y \) and \( Z \) is __________.

56.

\(0.400 \, \text{g}\) of an organic compound \((X)\) gave \(0.376 \, \text{g}\) of \(\mathrm{AgBr}\) in Carius method for estimation of bromine. \(\%\) of bromine in the compound \((X)\) is _________.
(Given: Molar mass \(\mathrm{AgBr} = 188 \, \text{g mol}^{-1}\), \(\mathrm{Br} = 80 \, \text{g mol}^{-1}\))

57.

The orbital angular momentum of an electron in \(3s\) orbital is \( \dfrac{x h}{2\pi} \). The value of \( x \) is __________. \((\text{Nearest integer})\)

58.

\(1 \, \text{g}\) of a carbonate \((\mathrm{M_2CO_3})\) on treatment with excess \(\mathrm{HCl}\) produces \(0.01 \, \text{mol}\) of \(\mathrm{CO_2}\). The molar mass of \(\mathrm{M_2CO_3}\) is __________ \(\text{g mol}^{-1}\). \((\text{Nearest integer})\)

59.

\(20 \, \text{mL}\) of \(0.1 \, \text{M}\) \(\mathrm{NaOH}\) is added to \(50 \, \text{mL}\) of \(0.1 \, \text{M}\) acetic acid solution. The \(\mathrm{pH}\) of the resulting solution is __________ \( \times 10^{-2} \) \((\text{Nearest integer})\)
Given: \( \mathrm{p}K_a(\mathrm{CH_3COOH}) = 4.76 \)
\( \log 2 = 0.30 \)
\( \log 3 = 0.48 \)

60.

At \(298 \, \text{K}\), the standard reduction potential for \(\mathrm{Cu^{2+}/Cu}\) electrode is \(0.34 \, \text{V}\).
Given: \(K_{sp}\,\mathrm{Cu(OH)_2} = 1 \times 10^{-20}\)
Take \( \dfrac{2.303\,RT}{F} = 0.059 \, \text{V} \)
The reduction potential at \(\mathrm{pH} = 14\) for the above couple is \((-) x \times 10^{-2} \, \text{V}\). The value of \( x \) is __________.

JEE Main 2023 13th April Evening Shift

Physics Chemistry Mathematics

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