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Chemistry

The crystal field stabilization energy (CFSE) and magnetic (spin-only) of an octahedral aqua complex of a metal ion \( (M^{z+}) \) are \( -0.8\,\Delta_0 \) and \( 3.87\,\text{BM} \), respectively. Identify \( (M^{Z+}) \):

Identify the element for which electronic configuration in \( +3 \) oxidation state is \( [\text{Ar}]3d^5 \):

Which one of the following gives the most stable Diazonium salt?

The stereoisomers that are formed by electrophilic addition of bromine to trans-but-\( 2 \)-ene is:

Hydrogen peroxide reacts with iodine in basic medium to give:

The oxide without nitrogen-nitrogen bond is:

In the following sequence of reactions a compound A, (molecular formula \( \mathrm{C_6H_{12}O_2} \)) with a straight chain structure gives a \( \mathrm{C_4} \) carboxylic acid. A is:
\( \text{A} \xrightarrow[\mathrm{H_3O^+}]{\mathrm{LiAlH_4}} \text{B} \xrightarrow{\text{Oxidation}} \mathrm{C_4} \text{ - Carboxylic acid} \)

Monomer units of Dacron polymer are:

In the given chemical reaction, colors of the \( \mathrm{Fe^{2+}} \) and \( \mathrm{Fe^{3+}} \) ions, are respectively:
\( 5\mathrm{Fe^{2+}} + \mathrm{MnO_4^-} + 8\mathrm{H^+} \rightarrow \mathrm{Mn^{2+}} + 4\mathrm{H_2O} + 5\mathrm{Fe^{3+}} \)

Which one of the following given graphs represents the variation of the rate constant \( k \) with temperature \( T \) for an endothermic reaction?

The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

Match List – I with List – II

Choose the most appropriate answer from the options given below:

Calamine and Malachite, respectively, are the ores of:

Experimentally reducing a functional group cannot be done by which one of the following reagents?

Number of paramagnetic oxides among the following given oxides is: \( \mathrm{Li_2O} \), \( \mathrm{CaO} \), \( \mathrm{Na_2O_2} \), \( \mathrm{KO_2} \), \( \mathrm{MgO} \) and \( \mathrm{K_2O} \)

Identify \( A \) in the following reaction.

Which one of the following compounds is aromatic in nature?

Given below are two statements:
Statement I: The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.
Statement II: The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product.
In the light of the above statements, choose the most appropriate answer from the options given below.

Water sample is called cleanest on the basis of which one of the BOD value given below.

In the following sequence of reactions, \(\mathrm{C_3H_6}\;\xrightarrow{H^+/H_2O}\;A\;\xrightarrow[\text{dil KOH}]{\mathrm{KIO}}\;B + C\). The compounds B and C respectively are:

A peptide synthesized by the reaction of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have____ peptide linkages.

If \( 80 \, \text{g} \) of copper sulphate \( \mathrm{CuSO_4 \cdot 5H_2O} \) is dissolved in deionized water to make \( 5 \, \text{L} \) of sodium. The concentration of the copper sulphate solution is \( x \times 10^{-3} \, \text{mol L}^{-1} \). The value of \( x \) is:

The spin-only magnetic moment value of \( \mathrm{B_2^{+}} \) species is ___ \( \times 10^{-2} \) BM . (Given : \( \sqrt{3} = 1.73 \) ]

The sum of oxidation states of two silver ions in $[\mathrm{Ag}(\mathrm{NH}_3)_2][\mathrm{Ag}(\mathrm{CN})_2]$ complex is:

The molar solubility of \( \text{Zn(OH)}_2 \) in \( 0.1 \, \text{M} \) NaOH sodium is \( x \times 10^{-18} \, \text{M} \). The value of \( x \) is:
(Given: The solubility product of \( \text{Zn(OH)}_2 \) is \( 2 \times 10^{20} \) )

If the conductivity of mercury at \( 0^\circ \text{C} \) is \( 1.07 \times 10^{6} \, \text{S m}^{-1} \) and the resistance of a cell containing mercury is \( 0.243 \, \Omega \), then the cell constant of the cell is \( x \times 10^{4} \, \text{m}^{-1} \). The value of \( x \) is:

An empty LPG cylinder weights \( 14.8 \, \text{kg} \). When full, it weights \( 29.0 \, \text{kg} \) and shows a pressure of \( 3.47 \, \text{atm} \). In the course of use at ambient temperature, the mass of the cylinder is reduced to \( 23.0 \, \text{kg} \). The final pressure inside the cylinder is ____ \( \text{atm} \). (Assume LPG to be an ideal gas)

For the reaction \( 2\text{NO}_2 (g) \rightleftharpoons \text{N}_2\text{O}_4 (g) \), when \( \Delta S = -176.0 \, \text{J K}^{-1} \) and \( \Delta H = -57.8 \, \text{kJ mol}^{-1} \), the magnitude of \( \Delta G \) at \( 298 \, \text{K} \) for the reaction is ____ \( \text{kJ mol}^{-1} \).

A \( 50 \) watt bulb emits monochromatic red light of wavelength of \( 795 \, \text{nm} \). The number of photons emitted per second by the bulb is \( x \times 10^{20} \). The value of \( x \) is:
[Given: \( h = 6.63 \times 10^{-34} \, \text{J s} \) and \( c = 3.0 \times 10^{8} \, \text{m s}^{-1} \)]

The number of atoms in \( 8 \, \text{g} \) of sodium is \( x \times 10^{23} \). The value of \( x \) is:
[Given: \( N_A = 6.02 \times 10^{23} \, \text{mol}^{-1} \)
Atomic mass of Na \( = 23.0 \, \text{u} \)]

JEE Main 2021 1st September Evening Shift

Physics Chemistry Mathematics

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The spin-only magnetic moment value of \( \mathrm{B_2^{+}} \) species is ___ \( \times 10^{-2} \) BM . (Given : \( \sqrt{3} = 1.73 \) ]