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Chemistry

For electron gain enthalpies of the elements denoted as $ \Delta_{eg}H $, the incorrect option is:

In a reaction,

reagents ‘X’ and ‘Y’ respectively are:

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): $ \mathrm{Cu^{2+}} $ in water is more stable than $ \mathrm{Cu^{+}} $.
Reason (R): Enthalpy of hydration for $ \mathrm{Cu^{2+}} $ is much less than that of $ \mathrm{Cu^{+}} $.
In the light of the above statements, choose the correct answer from the options given below:

34.

The starting material for convenient preparation of deuterated hydrogen peroxide $ \mathrm{(D_2O_2)} $ in laboratory is:

35.

$\text{O}-\text{O}$ bond length in $\text{H}_2\text{O}_2$ is $\underline{\text{X}}$ than the $\text{O}-\text{O}$ bond length in $\text{F}_2\text{O}_2$. The $\text{O}-\text{H}$ bond length in $\text{H}_2\text{O}_2$ is $\underline{\text{Y}}$ than that of the $\text{O}-\text{F}$ bond in $\text{F}_2\text{O}_2$.

Choose the correct option for $\underline{\text{X}}$ and $\underline{\text{Y}}$ from those given below:

36.

Which one of the following sets of ions represented a collection of isoelectronic species? (Given: Atomic number: $ \mathrm{F: \, 9} $, $ \mathrm{Cl: \, 17} $, $ \mathrm{Na = 11} $, $ \mathrm{Mg = 12} $, $ \mathrm{Al = 13} $, $ \mathrm{K = 19} $, $ \mathrm{Ca = 20} $, $ \mathrm{Sc = 21} $.)

37.

The effect of addition of helium gas to the following reaction in equilibrium state is:
$\text{PCl}_5(\text{g}) \rightleftharpoons \text{PCl}_3(\text{g}) + \text{Cl}_2(\text{g})$

38.

The correct order of bond enthalpy $ \mathrm({kJ \, mol^{-1}} $) is:

39.

The industrial activity held least responsible for global warming is:

40.

All structures given below are of vitamin C. Most stable of them is:

41.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): An aqueous solution of KOH when used for volumetric analysis, its concentration should be checked before the use.
Reason (R): On adding, KOH solution absorbs atmospheric $ \mathrm{CO_2} $.
In the light of the above statements, choose the correct answer from the option given below:

42.

Which element is not present in Nesskr’s reagent?

43.

In figure, a straight line is given for Freundlich Adsorption $ (y = 3x + 2.505) $. The value of $ \frac{1}{n} $ and $ \log K $ are respectively.

44.

Given below are two statements:
Statement I: Sulphanilic acid gives esterification test for carboxyl group.
Statement II: Sulphanilic acid gives red colour in Lassaigne’s test for extra element detection.
In the light of the above statements, choose the most appropriate answer from the option given below:

45.

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): Gypsum is used for making fireproof wall boards.
Reason (R): Gypsum is unstable at high temperatures.
In the light of the above statement, choose the correct from the options given below:

46.

The complex cation which has two isomers is:

47.

48.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): $ \alpha $-halocarboxylic acid on reaction with dil $ \mathrm{NH_3} $ gives good yield of $ \alpha $-amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides.
Reason (R): Amino acids exist in zwitter ion form in aqueous medium.
In the light of the above statements, choose the correct answer from the options given below:

49.

The graph which represents the following reaction is:

50.

The structures of major products $ \mathrm{A} $, $ \mathrm{B} $ and $ \mathrm{C} $ in the following reaction are sequence.

51.

The spin only magnetic moment of $ [\mathrm{Mn}(\mathrm{H_2O})_6]^{2+} $ complexes is ______ B.M. $[\text{Nearest integer}]$
$\text{Given: Atomic number of Mn is } 25$.

52.

Among following compounds, the number of those present in copper matte is _______.
$(A)$ $ \mathrm{CuCO_3} $ $(B)$ $ \mathrm{Cu_2S} $ $(C)$ $ \mathrm{Cu_2O} $ $(D)$ $ \mathrm{FeO} $

53.

A metal $ \mathrm{M} $ crystallizes into two lattices: face centred cubic $ (\mathrm{fcc}) $ and body centred cubic $ (\mathrm{bcc}) $ with unit cell edge length of $ 2.0 $ and 2.5 Å respectively. The ratio of densities of lattices fcc to bcc for the metal $ \mathrm{M} $ is ______. $[\text{Nearest integer}]$

54.

$ 20\% $ of acetic acid is dissociated when its $ 5 \, \mathrm{g} $ is added to $ 500 \, \mathrm{mL} $ of water. The depression in freezing point of such water is ______ $ \times 10^{-3} \, ^\circ\mathrm{C} $.
Atomic mass of $ \mathrm{C} $, $ \mathrm{H} $ and $ \mathrm{O} $ are $ 12 $, $ 1 $ and $ 16 $ a.m.u. respectively.
$[\text{Given: Molal depression constant and density of water are } 1.86 \, \mathrm{K\, mol^{-1}} \text{ and } 1 \, \mathrm{g\, cm^{-3}} \text{ respectively].}$

55.

The molality of a $ 10\% $ (v/v) solution of di-bromine solution in $ \mathrm{CCl_4} $ (carbon tetrachloride) is ‘$ x $’.
$ x = \_\_\_\_\_ \times 10^{-2}\,\mathrm{M} $. [Nearest integer]
(Given: molar mass of $ \mathrm{Br_2} = 160 \, \mathrm{g\,mol^{-1}} $, atomic mass of $ \mathrm{C} = 12 \, \mathrm{g\,mol^{-1}} $, atomic mass of $ \mathrm{Cl} = 35.5 \, \mathrm{g\,mol^{-1}} $, density of dibromine $ = 3.2 \, \mathrm{g\,cm^{-3}} $, density of $ \mathrm{CCl_4} = 1.6 \, \mathrm{g\,cm^{-3}} $).

56.

$ 0.3 \, \mathrm{g} $ of ethane undergoes combustion at $ 27^\circ \mathrm{C} $ in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by $ 0.5^\circ \mathrm{C} $. The heat evolved during combustion of ethane of constant pressure is $ \_\_\_\_\_ \, \mathrm{kJ\,mol^{-1}} $. [Nearest integer]
(Given: The heat capacity of the calorimeter system is $ 20 \, \mathrm{kJ\,K^{-1}} $, $ R = 8.3 \, \mathrm{J\,K^{-1}\,mol^{-1}} $. Assume ideal gas behavior. Atomic mass of $ \mathrm{C} $ and $ \mathrm{H} $ are $ 12 $ and $ 1 \, \mathrm{g\,mol^{-1}} $ respectively).

57.

$ 1 \times 10^{-5} \, \mathrm{M} \, \mathrm{AgNO_3} $ is added to $ 1 \, \mathrm{L} $ of saturated solution of $ \mathrm{AgBr} $. The conductivity of this solution at $ 298 \, \mathrm{K} $ is $ \_\_\_\_\_ \times 10^{-8} \, \mathrm{S\,m^{-1}} $.
[Given: $ K_{sp}(\mathrm{AgBr}) = 4.9 \times 10^{-13} $ at $ 298 \, \mathrm{K} $, $ \Lambda^{0}_{\mathrm{Ag^+}} = 6 \times 10^{-3} \, \mathrm{S\,m^{2}\,mol^{-1}} $, $ \Lambda^{0}_{\mathrm{Br^-}} = 8 \times 10^{-3} \, \mathrm{S\,m^{2}\,mol^{-1}} $, $ \Lambda^{0}_{\mathrm{NO_3^-}} = 7 \times 10^{-3} \, \mathrm{S\,m^{2}\,mol^{-1}} $.]

58.

Testosterone, which is a steroidal hormone, has the following structure.

The total number of asymmetric carbon atom/s in testosterone is $ \_\_\_\_\_ $.

59.

$ \mathrm{A} \rightarrow \mathrm{B} $
The above reaction is of zero order. Half-life of this reaction is $ 50 \, \mathrm{min} $. The time taken for the concentration of $ \mathrm{A} $ to reduce to one-fourth of its initial value is $ \_\_\_\_\_ \, \mathrm{min} $. [Nearest integer]

60.

Among the following the number of tranquilizer’s is/are $ \_\_\_\_\_ $.
$ (\mathrm{A}) $ Chloroliazepoxide $ (\mathrm{B}) $ Veronal $ (\mathrm{C}) $ Valium $ (\mathrm{D}) $ Salvarsan

JEE Main 2023 1st Feb Evening Shift

Physics Chemistry Mathematics

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The industrial activity held least responsible for global warming is:

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