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Chemistry

Match List-I with List-II:

Choose the most appropriate answer from the options given below:

Considering the above chemical reaction, identify the product “X”:

A non-reducing sugar “A” hydrolyses to give \( two \) reducing mono saccharides. Sugar A is:

The correct structures of trans-\( [\mathrm{NiBr_2}(\mathrm{PPh_3})_2] \) and meridional-\( [\mathrm{Co}(\mathrm{NH_3})_3(\mathrm{NO_2})_3] \), respectively, are:

Match List-I with List-II:

Choose the most appropriate answer from the options given below:

Consider the above chemical reaction and identify product “A”:

Consider the above reaction, X and Y respectively are:

The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

A certain orbital has no angular nodes and two radial nodes. The orbital is:

The number of ionizable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:

The ionic radius of \( \mathrm{Na^+} \) ion is 1.02 Å. The ionic radii (in Å) of \( \mathrm{Mg^{2+}} \) and \( \mathrm{Al^{3+}} \), respectively, are:

Given below are two Statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: During the boiling of water having temporary hardness, \( \mathrm{Mg(HCO_3)_2} \) is converted to \( \mathrm{MgCO_3} \).
Reason R: The solubility product of \( \mathrm{Mg(OH)_2} \) is greater than that of \( \mathrm{MgCO_3} \).
In the light of the above statements, choose the most appropriate answer from the options given below:

Match List-I with List-II:

The statements that are TRUE:
(A) methane leads to both global warming and photochemical smog
(B) methane is generated from paddy fields
(C) methane is a stronger global warming gas than \( \mathrm{CO_2} \)
(D) methane is a part of reducing smog
Choose the most appropriate answer from the options given below:

In a binary compound, atoms of element A form a hcp structure and those of element M occupy \( \frac{2}{3} \) of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

Reaction of Grignard reagent, \( \mathrm{C_2H_5MgBr} \) with \( \mathrm{C_8H_8O} \) followed by hydrolysis gives compound "A" which reacts instantly with Lucas reagent to give compound B, \( \mathrm{C_{10}H_{13}Cl} \). The compound B is:

Match List-I with List-II:

Choose the most appropriate match:

Reagent, \( 1 \)-naphthylamine and sulphanilic acid in acetic acid is used for the detection of:

Compound with molecular formula \( \mathrm{C_3H_6O} \) can show:

Match List-I with List-II:

Choose the most appropriate answer from the options given below:

For the reaction \( \mathrm{C_2H_6 \rightarrow C_2H_4 + H_2} \)
the reaction enthalpy \( \Delta_r H = \) __________ \( \mathrm{kJ\,mol^{-1}} \). (Round off to the Nearest Integer).
[Given: Bond enthalpies in \( \mathrm{kJ\,mol^{-1}} \) : C–C : \( 347 \), C = C : \( 611 \); C–H: \( 414 \), H–H : \( 436 \)]

In order to prepare a buffer solution of pH \( 5.74 \), sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is \( 1.0 \) \( \mathrm{M} \), the concentration of sodium acetate in the buffer is __________ \( \mathrm{M} \). (Round off to the Nearest Integer).
[Given: \( \mathrm{p}K_a \) (acetic acid) = \( 4.74 \)]

The total number of unpaired electrons present in the complex \( \mathrm{K_3[Cr(oxalate)_3]} \) is __________.

AX is a covalent diatomic molecule where A and X are second row elements of periodic table. Based on Molecular orbital theory, the bond order of AX is \( 2.5 \). The total number of electrons in AX is __________. (Round off to the Nearest Integer).

Complete combustion of \( 3 \, \text{g} \) of ethane gives \( x \times 10^{22} \) molecules of water. The value of \( x \) is ____________. (Round off to the nearest integer).
[Use: \( N_A = 6.023 \times 10^{23} \); Atomic masses in \( \text{u} \) : \( \text{C} : 12.0 \); \( \text{O} : 16.0 \); \( \text{H} : 1.0 \)]

\( 2 \) molal solution of a weak acid \( \mathrm{HA} \) has a freezing point of \( 3.885^\circ \mathrm{C} \). The degree of dissociation of this acid is ____________ \( \times 10^{-3} \). (Round off to the Nearest Integer).
[Given: Molal depression constant of water \( = 1.85 \, \mathrm{K \, kg \, mol^{-1}} \), Freezing point of pure water \( = 0^\circ \mathrm{C} \)]

A reaction of \( 0.1 \) mole of Benzylamine with bromomethane gave \( 23 \, \text{g} \) of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are \( n \times 10^{-1} \), when \( n = \) ____________. (Round off to the Nearest Integer).
[Given: Atomic masses: \( \text{C} : 12.0 \, \text{u} \), \( \text{H} : 1.0 \, \text{u} \), \( \text{N} : 14.0 \, \text{u} \), \( \text{Br} : 80.0 \, \text{u} \)]

$2\text{NO}\text{ (g)} + \text{Cl}_2\text{ (g)} \rightleftharpoons 2\text{NOCl}\text{(s)}$
This reaction was studied at \( -10^\circ \mathrm{C} \) and the following data was obtained.

\( [\mathrm{NO}]_0 \) and \( [\mathrm{Cl_2}]_0 \) are the initial concentrations and \( r_0 \) is the initial reaction rate.
The overall order of the reaction is ____________. (Round off to the Nearest Integer).

For the reaction
$2\text{Fe}^{3+}(\text{aq}) + 2\text{I}^-(\text{aq}) \rightarrow 2\text{Fe}^{2+}(\text{aq}) + \text{I}_2(\text{s})$
the magnitude of the standard molar free energy change,
$\Delta_{\text{r}}\text{G}_{\text{m}}^\circ = -\text{________ kJ}$ (Round off to the Nearest Integer).

____________ grams of 3-Hydroxy propanal \( \text{MW} = 74 \) must be dehydrated to produce \( 7.8 \, \text{g} \) of acrolein \( \text{MW} = 56 \) \( \mathrm{C_3H_4O} \) if the percentage yield is \( 64 \). (Round off to the Nearest Integer).
[Given: Atomic masses: \( \text{C} : 12.0 \, \text{u} \), \( \text{H} : 1.0 \, \text{u} \), \( \text{O} : 16.0 \, \text{u} \)]

JEE Main 2021 18th March Morning Shift

Physics Chemistry Mathematics

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The total number of unpaired electrons present in the complex \( \mathrm{K_3[Cr(oxalate)_3]} \) is __________.