NTA JEE Main 2025 April 4th Shift 1

On charging the lead storage battery, the oxidation state of lead changes from $$x_1$$ to $$y_1$$ at the anode and from $$x_2$$ to $$y_2$$ at the cathode. The values of $$x_1, y_1, x_2, y_2$$ are respectively:

Given below are two statements:
Statement I: Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of $$p\pi - p\pi$$ bond with oxygen.
Statement II: Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it.
In the light of given statements, choose the correct answer from the options given below.

Benzene is treated with oleum to produce compound (X) which when further heated with molten sodium hydroxide followed by acidification produces compound (Y). The compound Y is treated with zinc metal to produce compound (Z). Identify the structure of compound (Z) from the following option.

Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. $$(B \lt Al), (Al \lt Ga), (Ga \lt In)$$ and $$(In \lt Tl)$$. Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius ($$M^{3+}$$) than the other one. The atomic number of the element (X) is

An organic compound (X) with molecular formula $$C_3H_6O$$ is not readily oxidised. On reduction it gives $$(C_3H_8O)(Y)$$ which reacts with HBr to give a bromide (Z) which is converted to Grignard reagent. This Grignard reagent on reaction with (X) followed by hydrolysis gives 2,3-dimethylbutan-2-ol. Compounds (X), (Y) and (Z) respectively are:

Predict the major product of the following reaction sequence:

Given below are two statements:
Statement I: The dipole moment of $$\overset{4}{\mathrm{CH_3}} - \overset{3}{\mathrm{CH}} = \overset{2}{\mathrm{CH}} - \overset{1}{\mathrm{CH}}=O$$ is greater than $$\overset{4}{\mathrm{CH_3}} - \overset{3}{\mathrm{CH_2}} - \overset{2}{\mathrm{CH_2}} - \overset{1}{\mathrm{CH}}=O$$.
Statement II: $$C_1-C_2$$ bond length of $$\underset{4}{\mathrm{CH_3}} - \underset{3}{\mathrm{CH}} = \underset{2}{\mathrm{CH}} - \underset{1}{\mathrm{CH}}=O$$ is greater than $$C_1-C_2$$ bond length of $$\underset{4}{\mathrm{CH_3}} - \underset{3}{\mathrm{CH_2}} - \underset{2}{\mathrm{CH_2}} - \underset{1}{\mathrm{CH}}=O$$.
In the light of the above statements, choose the correct answer from the options given below

Pair of transition metal ions having the same number of unpaired electrons is:

Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect? (Bohr's radius is represented by $$a_0$$)