NTA JEE Main 17th March 2021 Shift 1 - Chemistry

The absolute value of the electron gain enthalpy of halogens satisfies:

A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is:

Which of the following compound CANNOT act as a Lewis base?

The INCORRECT statement(s) about heavy water is (are):
(A) used as a moderator in nuclear reactor
(B) obtained as a by-product in fertilizer industry.
(C) used for the study of reaction mechanism
(D) has a higher dielectric constant than water
Choose the correct answer from the options given below:

The correct order of conductivity of ions in water is:

Which of the following is an aromatic compound?

Mesityl oxide is a common name of:

Given below are two statements:
Statement-I: Retardation factor ($$R_f$$) can be measured in meter/centimetre.
Statement-II: $$R_f$$ value of a compound remains constant in all solvents.
Choose the most appropriate answer from the options given below:

Reducing smog is a mixture of:

A colloidal system consisting of a gas dispersed in a solid is called a/an:

The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates:

Given below are two statements:
Statement I: Potassium permanganate on heating at 573 K forms potassium manganate.
Statement II: Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature.
In the light of the above statements, choose the most appropriate answer from the options given below:

What is the spin-only magnetic moment value (B.M.) of a divalent metal ion with atomic number 25, in its aqueous solution?

The above reaction requires which of the following reaction conditions?

The product "A" in the above reaction is:

Hoffmann bromamide degradation of benzamide gives product A, which upon heating with CHCl$$_3$$ and NaOH gives product B. The structures of A and B are:

Which of the following reaction is an example of ammonolysis?

With respect to drug-enzyme interaction, identify the wrong statement:

Which of the following is correct structure of tyrosine?

In the above reaction, 3.9 g of benzene on nitration gives 4.92 g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is ________ %. (Round off to the Nearest Integer).
(Given atomic mass: C: 12.0 u, H: 1.0 u, O: 16.0 u, N: 14.0 u)

The mole fraction of a solute in a 100 molal aqueous solution is ________ $$\times 10^{-2}$$. (Round off to the Nearest Integer).
[Given: Atomic masses: H: 1.0 u, O: 16.0 u]

A certain orbital has $$n = 4$$ and $$m_l = -3$$. The number of radial nodes in this orbital is ________. (Round off to the Nearest Integer).

The pressure exerted by a non-reactive gaseous mixture of 6.4 g of methane and 8.8 g of carbon dioxide in a 10 L vessel at 27°C is ________ kPa. (Round off to the Nearest Integer).
[Assume gases are ideal, R = 8.314 J mol$$^{-1}$$ K$$^{-1}$$, Atomic masses: C: 12.0 u, H: 1.0 u, O: 16.0 u]

The standard enthalpies of formation of $$Al_2O_3$$ and CaO are $$-1675$$ kJ mol$$^{-1}$$ and $$-635$$ kJ mol$$^{-1}$$ respectively. For the reaction $$3CaO + 2Al \to 3Ca + Al_2O_3$$ the standard reaction enthalpy $$\Delta_r H^0$$ = ________ kJ. (Round off to the Nearest Integer).

0.01 moles of a weak acid HA ($$K_a = 2.0 \times 10^{-6}$$) is dissolved in 1.0 L of 0.1M HCl solution. The degree of dissociation of HA is ________ $$\times 10^{-5}$$. (Round off to the Nearest Integer). [Neglect volume change on adding HA and assume degree of dissociation << 1]

15 mL of aqueous solution of $$Fe^{2+}$$ in acidic medium completely reacted with 20 mL of 0.03 M aqueous $$Cr_2O_7^{2-}$$. The molarity of the $$Fe^{2+}$$ solution is ________ $$\times 10^{-2}$$ M. (Round off to the Nearest Integer).

The oxygen dissolved in water exerts a partial pressure of 20 kPa in the vapour above water. The molar solubility of oxygen in water is ________ $$\times 10^{-5}$$ mol dm$$^{-3}$$. (Round off to the Nearest Integer).
[Given: Henry's law constant = $$K_H = 8.0 \times 10^4$$ kPa for O$$_2$$. Density of water with dissolved oxygen = 1.0 kg dm$$^{-3}$$]

For a certain first order reaction 32% of the reactant is left after 570 s. The rate constant of this reaction is ________ $$\times 10^{-3}$$ s$$^{-1}$$. (Round off to the Nearest Integer).
[Given: $$\log_{10} 2 = 0.301$$, $$\ln 10 = 2.303$$]

The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product A. The reaction 1 mol of A with excess of AgNO$$_3$$ in aqueous medium gives ________ mole(s) of Ag. (Round off to the Nearest Integer).