NTA JEE Mains 5th April 2024 Shift 1 - Chemistry

An organic compound has $$42.1\%$$ carbon, $$6.4\%$$ hydrogen and remainder is oxygen. If its molecular weight is 342, then its molecular formula is :

The incorrect postulates of the Dalton's atomic theory are : (A) Atoms of different elements differ in mass. (B) Matter consists of divisible atoms. (C) Compounds are formed when atoms of different element combine in a fixed ratio. (D) All the atoms of given element have different properties including mass. (E) Chemical reactions involve reorganisation of atoms. Choose the correct answer from the options given below :

Given below are two statements :

Statement I : In group 13, the stability of +1 oxidation state increases down the group. 

Statement II : The atomic size of gallium is greater than that of aluminium. 

In the light of the above statements, choose the most appropriate answer from the options given below :

The statement(s) that are correct about the species $$O^{2-}, F^-, Na^+$$ and $$Mg^{2+}$$. (A) All are isoelectronic (B) All have the same nuclear charge (C) $$O^{2-}$$ has the largest ionic radii (D) $$Mg^{2+}$$ has the smallest ionic radii. Choose the most appropriate answer from the options given below :

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always $$-57 \text{ kJ mol}^{-1}$$. Reason (R) : Enthalpy of neutralisation is the amount of heat liberated when one mole of $$H^+$$ ions furnished by acid combine with one mole of $$OH^-$$ ions furnished by base to form one mole of water. In the light of the above statements, choose the correct answer from the options given below.

The following reaction occurs in the Blast furnace where iron ore is reduced to iron metal $$Fe_2O_{3(s)} + 3CO_{(g)} \rightleftharpoons Fe_{(l)} + 3CO_{2(g)}$$. Using the Le-Chatelier's principle, predict which one of the following will not disturb the equilibrium.

The number of neutrons present in the more abundant isotope of boron is '$$x$$'. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is '$$y$$'. The value of $$x + y$$ is ______

Number of $$\sigma$$ and $$\pi$$ bonds present in ethylene molecule is respectively :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Cis form of alkene is found to be more polar than the trans form. Reason (R) : Dipole moment of trans isomer of 2-butene is zero. In the light of the above statements, choose the correct answer from the options given below :

For the Compounds : (A) $$H_3C-CH_2-O-CH_2-CH_2-CH_3$$

(B) $$H_3C-CH_2-CH_2-CH_2-CH_2-CH_3$$ (

C)

(D) 

The increasing order of boiling point is :

Given below are two statements: Statement I : Nitration of benzene involves the following step 

Statement II : Use of Lewis base promotes the electrophilic substitution of benzene. In the light of the above statements, choose the most appropriate answer from the options given below :

The reaction at cathode in the cells commonly used in clocks involves.

Molar ionic conductivities of divalent cation and anion are $$57 \text{ S cm}^2 \text{ mol}^{-1}$$ and $$73 \text{ S cm}^2 \text{ mol}^{-1}$$ respectively. The molar conductivity of solution of an electrolyte with the above cation and anion will be :

The metal that shows highest and maximum number of oxidation state is :

Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, $$Cr = 24, Mn = 25, Fe = 26, Co = 27$$]

The correct order of ligands arranged in increasing field strength.

Given below are two statements: Statement I : Bromination of phenol in solvent with low polarity such as $$CHCl_3$$ or $$CS_2$$ requires Lewis acid catalyst. Statement II : The Lewis acid catalyst polarises the bromine to generate $$Br^+$$. In the light of the above statements, choose the correct answer from the options given below :

Identify compound (Z) in the following reaction sequence.

Identify '$$A$$' in the following reaction:

Which of the following gives a positive test with ninhydrin?

$$9.3 \text{ g}$$ of pure aniline is treated with bromine water at room temperature to give a white precipitate of the product '$$P$$'. The mass of product '$$P$$' obtained is $$26.4 \text{ g}$$. The percentage yield is ______ %.

The value of Rydberg constant $$(R_H)$$ is $$2.18 \times 10^{-18} \text{ J}$$. The velocity of electron having mass $$9.1 \times 10^{-31} \text{ kg}$$ in Bohr's first orbit of hydrogen atom $$=$$ ______ $$\times 10^5 \text{ ms}^{-1}$$ (nearest integer).

In the Lewis dot structure for $$NO_2^-$$, total number of valence electrons around nitrogen is ______

The heat of combustion of solid benzoic acid at constant volume is $$-321.30 \text{ kJ}$$ at $$27°C$$. The heat of combustion at constant pressure is $$(-321.30 - xR) \text{ kJ}$$, the value of $$x$$ is ______.

An artificial cell is made by encapsulating $$0.2 \text{ M}$$ glucose solution within a semipermeable membrane. The osmotic pressure developed when the artificial cell is placed within a $$0.05 \text{ M NaCl}$$ solution at $$300 \text{ K}$$ is ______ $$\times 10^{-1} \text{ bar}$$. (nearest integer). [Given : $$R = 0.083 \text{ L bar mol}^{-1} \text{ K}^{-1}$$] Assume complete dissociation of $$NaCl$$

During Kinetic study of reaction $$2A + B \to C + D$$, the following results were obtained :
I: A = 0.1 M, B = 0.1 M, initial rate of formation of D = $$6.0 \times 10^{-3}$$
II: A = 0.3 M, B = 0.2 M, initial rate = $$7.20 \times 10^{-2}$$
III: A = 0.3 M, B = 0.4 M, initial rate = $$2.88 \times 10^{-1}$$
IV: A = 0.4 M, B = 0.1 M, initial rate = $$2.40 \times 10^{-2}$$
Based on above data, overall order of the reaction is ______

The spin-only magnetic moment value of the ion among $$Ti^{2+}, V^{2+}, Co^{3+}$$ and $$Cr^{2+}$$, that acts as strong oxidising agent in aqueous solution is ______ BM (Near integer). (Given atomic numbers : $$Ti : 22, V : 23, Cr : 24, Co : 27$$)

The number of halobenzenes from the following that can be prepared by Sandmeyer's reaction is ______

Consider the given chemical reaction sequence :

Total sum of oxygen atoms in Product A and Product B are ______

In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is ______ BM (Nearest integer) [Given atomic number of $$Cu = 29, Ni = 28, Mn = 25, Fe = 26$$]