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Chemistry

The water having more dissolved \( \mathrm{O_2} \) is:

Which one of the following molecules does not show stereo isomerism?

Isotope(s) of hydrogen which emits low energy \( \beta^{-0} \) particles \( t_{1/2} \) value \( > 12 \) years is/are:

Which one of the following compounds does not exhibit resonance?

Sulphide ion is soft base and its ores are common for metals.
\( (a) \) Pb \( \quad (b) \) Al \( \quad (c) \) Ag \( \quad (d) \) Mg
Choose the correct answer from the options given below:

Given below are the statements about diborane.
\( (a) \) Diborane is prepared by the oxidation of \( \mathrm{NaBH_4} \) with \( \mathrm{I_2} \)
\( (b) \) Each boron atom is in \( sp^{2} \) hybridized state
\( (c) \) Diborane has one bridged \( 3 \) centre-\( 2 \)-electron bond
\( (d) \) Diborane is a planar molecule
The option with correct statement(s) is:

Which one of the following compounds will provide a tertiary alcohol on reaction with excess of \( \mathrm{CH_3MgBr} \) followed by hydrolysis?

In the chemical reactions given above \( A \) and \( B \) respectively.

Which one of the following group-\( 15 \) hydride is the strongest reducing agent?

When silver nitrate solution is added to potassium iodide solution then the sol produced is:

Which one of the following reactions does not occur?

Which one of the following statements for D.I. Mendeleeff, is incorrect?

Match List-I with List-II:

Choose the correct answer from the options given below:

Which one of the following \( 0.06 \, \text{M} \) aqueous solutions has lowest freezing point?

The set having ion which are coloured and paramagnetic both is:

An organic compound A \( (\mathrm{C_6H_6O}) \) gives dark green colouration with ferric chloride. On treatment with \( \mathrm{CHCl_3} \) and \( \mathrm{KOH} \), followed by acidification gives compound B. can also be obtained from compound C on reaction with pyridinium chlorochromate (PCC).

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:

Thiamine and pyridoxine are also known respectively as:

Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?

A copper complex crystallising in a CCP lattice with a cell edge of \( 0.4518 \, \text{nm} \) has been revealed employing X-ray diffraction studies. The density of a copper complex is found to be \( 7.62 \, \text{g cm}^{-3} \). The molar mass of copper complex is ______ \( \text{g mol}^{-1} \). (Nearest integer)
[Given: \( N_a = 6.022 \times 10^{23} \, \text{mol}^{-1} \)]

If the standard molar enthalpy change for combustion of graphite powder is \( -2.48 \times 10^{2} \, \text{kJ mol}^{-1} \), the amount of heat generated on combustion of \( 1 \, \text{g} \) of graphite powder is ______ \( \text{kJ} \). (Nearest integer)

The number of acyclic structural isomers (including geometrical isomers) for pentene are ______.

Value of \( K_p \) for the equilibrium reaction \( \mathrm{N_2O_{4(g)}} \rightleftharpoons 2\,\mathrm{NO_{2(g)}} \) at \( 298 \, \text{K} \) is \( 47.9 \). The \( K_c \) for this reaction at same temperature is ______. (Nearest integer)
\(( R = 0.83 \, \text{L bar K}^{-1} \text{mol}^{-1} )\)

Assume a cell with the following reaction
\( \mathrm{Cu_{(s)}} + 2\,\mathrm{Ag^+}\,(1 \times 10^{-3}\,\mathrm{M}) \rightarrow \mathrm{Cu^{2+}}\,(0.250\,\mathrm{M}) + 2\,\mathrm{Ag_{(s)}} \)
\( E^{\ominus}_{\text{cell}} = 2.97 \,\text{V} \)
\( E_{\text{cell}} \) for the above reaction is _______ V. (Nearest integer)
[Given: \( \log 2.5 = 0.3979, \ T = 298 \,\text{K} \)]

Methylation of \( 10 \,\text{g} \) of benzene gave \( 9.2 \,\text{g} \) of toluene. Calculate the percentage yield of toluene _______. (Nearest integer)

The total number of unpaired electrons present in \( [\mathrm{Co(NH_3)_6}]\mathrm{Cl}_2 \) and \( [\mathrm{Co(NH_3)_6}]\mathrm{Cl}_3 \) is:

Number of electrons that Vanadium \( (Z = 23) \) has in \( p \)-orbitals is equal to _______.

\( \mathrm{N_2O_{5(g)}} \rightarrow 2\,\mathrm{NO_{2(g)}} + \dfrac{1}{2}\,\mathrm{O_{2(g)}} \)
In the above first order reaction the initial concentration of \( \mathrm{N_2O_5} \) is \( 2.40 \times 10^{-2} \,\mathrm{mol\,L^{-1}} \) at \( 318 \,\text{K} \). The concentration of \( \mathrm{N_2O_5} \) after \( 1 \) hour was \( 1.60 \times 10^{-2} \,\mathrm{mol\,L^{-1}} \). The rate constant of the reaction at \( 318 \,\text{K} \) is _______ \( \times 10^{-3} \,\mathrm{min^{-1}} \). (Nearest integer)
[Given: \( \log 3 = 0.477, \\ \log 5 = 0.699 \)]

If the concentration of glucose \( \mathrm{(C_6H_{12}O_6} )\) in blood is \( 0.72 \,\mathrm{g\,L^{-1}} \), the molarity of glucose in blood is _______ \( \times 10^{-3} \,\mathrm{M} \). (Nearest integer)
[Given: Atomic mass of \( \mathrm{C} = 12 \), \( \mathrm{H} = 1 \), \( \mathrm{O} = 16 \,\mathrm{u} \)]

JEE Main 2021 22nd July Evening Shift

Physics Chemistry Mathematics

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The total number of unpaired electrons present in \( [\mathrm{Co(NH_3)_6}]\mathrm{Cl}_2 \) and \( [\mathrm{Co(NH_3)_6}]\mathrm{Cl}_3 \) is: