NTA JEE Main 2025 April 7th Shift 1 - Chemistry

Given below are two statements :
Statement I : Ozonolysis followed by treatment with Zn, H$$_2$$O of cis-2-butene gives ethanal.
Statement II : The production obtained by ozonolysis followed by treatment with Zn, H$$_2$$O of 3, 6-dimethyloct-4-ene has no chiral carbon atom.
In the light of the above statements, choose the correct answer from the options given below

Which of the following amine(s) show(s) positive carbylamines test?

Choose the correct answer from the options given below :

Reaction $$A(g) \rightarrow 2B(g) + C(g)$$ is a first order reaction. It was started with pure A.

Which of the following option is incorrect?

Total enthalpy change for freezing of 1 mol water at 10 degrees C to ice at -10 degrees C is ______
(Given : $$\Delta_{fus}H = x$$ kJ/mol, $$C_p[H_2O(l)] = y$$ J mol$$^{-1}$$ K$$^{-1}$$, $$C_p[H_2O(s)] = z$$ J mol$$^{-1}$$ K$$^{-1}$$)

An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The pH of HCl solution would
(Given log 2 = 0.30)

Given below are two statements :
Statement I : Dimethyl ether is completely soluble in water. However, diethyl ether is soluble in water to a very small extent.
Statement II : Sodium metal can be used to dry diethyl ether and not ethyl alcohol.
In the light of  given statements, choose the correct answer from the options given below

Which of the following statements are correct, if the threshold frequency of caesium is $$5.16 \times 10^{14}$$ Hz?
A. When Cs is placed inside a vacuum chamber with an ammeter connected to it and yellow light is focused on Cs the ammeter shows the presence of current.
B. When the brightness of the yellow light is dimmed, the value of the current in the ammeter is reduced.
C. When a red light is used instead to the yellow light, the current produced is higher with respect to the yellow light.
D. When a blue light is used, the ammeter shows the formation of current.
E. When a white light is used, the ammeter shows formation of current.

Which of the following is the correct IUPAC name of given organic compound (X)?

At the sea level, the dry air mass percentage composition is given as nitrogen gas : 70.0, oxygen gas : 27.0 and argon gas : 3.0. If total pressure is 1.15 atm, then calculate the ratio of followings respectively :
(i) partial pressure of nitrogen gas to partial pressure of oxygen gas
(ii) partial pressure of oxygen gas to partial pressure of argon gas
(Given : Molar mass of $$N, O$$ and $$Ar$$ are 14, 16, and 40 g $$mol^{-1}$$ respectively)

Given below are two statements :
Statement I : Mohr's salt is composed of only three types of ions-ferrous, ammonium and sulphate.
Statement II : If the molar conductance at infinite dilution of ferrous, ammonium and sulphate ions are $$x_1$$, $$x_2$$ and $$x_3$$ S cm$$^2$$ mol$$^{-1}$$, respectively then the molar conductance for Mohr's salt solution at infinite dilution would be given by $$x_1 + x_2 + 2x_3$$
In the light of the given statements, choose the correct answer from the options given below :

The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is

When a salt is treated with sodium hydroxide solution it gives gas X. On passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ mol$$^{-1}$$ respectively. The above values are lowest among their group members. The nature of their ions $$A^{2+}$$ $$B^{4+}$$ respectively is

The first transition series metal 'M' has the highest enthalpy of atomisation in its series. One of its aquated ion ($$M^{n+}$$) exists in green colour. The nature of the oxide formed by the above $$M^{n-}$$ ion is :

Which of the following compounds is least likely to give effervescence of $$CO_2$$ in presence of aq. NaHCO$$_3$$?

Match the LIST-I with LIST-II.

Choose the correct answer from the options given below :

A person's wound was exposed to some bacteria and then bacteria growth started to happen at the same place. The wound was later treated with some antibacterial medicine and the rate of bacterial decay (r) was found to be proportional with the square of the existing number of bacteria at any instance. Which of the following set of graphs correctly represents the 'before' and 'after' situation of the application of the medicine?
[Given : N = No. of bacteria, t = time, bacteria growth follows $$I^{st}$$ order kinetics.]

Given below are two statements :
Statement I: D-(+)-glucose + D-(+)-fructose $$\xrightarrow{-H_2O}$$ sucrose
sucrose $$\xrightarrow{Hydrolysis}$$ D-(+)-glucose + D-(+)-fructose
Statement II : Invert sugar is formed during sucrose hydrolysis.
In the light of the above statements, choose the correct answer from the options given below-

An octahedral complex having molecular composition $$Co \cdot 5NH_3 \cdot Cl \cdot SO_4$$ has two isomers A and B. The solution of A gives a white precipitate with $$AgNO_3$$ solution and the solution of B gives white precipitate with $$BaCl_2$$ solution. The type of isomerism exhibited by the complex is,

The reactions which cannot be applied to prepare an alkene by elimination, are

Choose the correct answer from the options given below : 

An organic compound weighing 500 mg, produced 220 mg of $$CO_2$$ on complete combustion. The percentage composition of carbon in the compound is .......... %. (nearest integer)
(Given molar mass in g $$mol^{-1}$$ of C : 12, O : 16)

Thyroxine, the hormone has the given below structure.

The percentage of iodine in thyroxine is .......... %. (nearest integer)
(Given molar mass in g mol$$^{-1}$$ of C:12, H:1, O:16, N:14, I:127)

1 Faraday electricity was passed through $$Cu^{2+}$$ (1.5 M, 1 L)/Cu and 0.1 Faraday was passed through $$Ag^+$$ (0.2 M, 1 L)/Ag electrolytic cells. After this the two cells were connected as shown below to make an electrochemical cell. The emf of the cell thus formed at 298 K is ______. (Given: $$E^0_{Cu^{2+}/Cu} = 0.34$$ V, $$E^0_{Ag^+/Ag} = 0.8$$ V, $$\frac{2.303RT}{F} = 0.06$$ V)

The percentage dissociation of a salt (MX$$_3$$) solution at given temperature (van't Hoff factor i = 2) is .......... % (Nearest Integer)

The number of paramagnetic complex among $$[FeF_6]^{3-}$$, $$[Fe(CN)_6]^{3-}$$, $$[Mn(CN)_6]^{3-}$$, $$[Co(C_2O_4)_3]^{3-}$$, $$[MnCl_6]^{3-}$$ and $$[CoF_6]^{3-}$$, which involved $$d^2sp^3$$ hybridisation of metal is ______.