NTA JEE Mains 4th April Shift 1 2026

Number of moles and number of molecules in 1.4187 L of $$\text{SO}_2$$ at STP respectively are :

What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett series?

Which of the following is correct set of 4 quantum numbers of 19th electron in Chromium (Atomic number = 24) in accordance with Aufbau principle?

Given below are two statements:
Statement I: For an ideal gas, heat capacity at constant volume is always greater than the heat capacity at constant pressure.
Statement II: In a constant volume process, no work is produced and all the heat withdrawn goes into the chaotic motion and is reflected by a temperature increase of the ideal gas.
In the light of the above statement, choose the correct answer from the options given below.  

At $$T$$(K), the equilibrium constant of $$A_2(g) + B_2(g) \rightleftharpoons C(g)$$ is $$2.7 \times 10^{-5}$$. What is the equilibrium constant for $$\frac{1}{3}A_2(g) + \frac{1}{3}B_2(g) \rightleftharpoons \frac{1}{3}C(g)$$ at the same temperature?

In order to oxidise a mixture of 1 mole each of $$\text{FeC}_2\text{O}_4$$, $$\text{Fe}_2(\text{C}_2\text{O}_4)_3$$, $$\text{FeSO}_4$$ and $$\text{Fe}_2(\text{SO}_4)_3$$ in acidic medium, the number of moles of $$\text{KMnO}_4$$ required is :

Consider the first order reaction $$R \to P$$. The fraction of molecules decomposed in the given first order reaction can be expressed as :

A monoatomic anion $$(A^-)$$ has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element $$(A)$$ respectively are :

Given below are two statements:
Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in $$\text{SO}_2$$ is $$-2$$ and in $$\text{OF}_2$$ it is $$+2$$.
Statement II: The anomalous behaviour of oxygen when compared to the other elements of group 16 is due to its small size and high electronegativity.
In the light of the above statements, choose the correct answer from the options given below

The correct statements among the following are:
A. Mo(VI) and W(VI) are less stable than Cr(VI).
B. Ce$$^{4+}$$ and Tb$$^{4+}$$ are oxidant while Eu$$^{2+}$$ and Yb$$^{2+}$$ are reductant.
C. Cm and Am have seven unpaired electrons.
D. Actinoid contraction is greater from element to element than lanthanoid contraction.
choose the correct answer from the options given below: