NTA JEE Mains 2nd April Shift 1 2026

The mass of iron converted into Fe$$_3$$O$$_4$$ by the action of 18 g of steam is : (Given : Molar mass of H, O and Fe are 1, 16 and 56 g mol$$^{-1}$$ respectively) Assume iron is present in excess :

What is the energy (in J atom$$^{-1}$$) required for the following process? $$\text{Li}^{2+}(g) \rightarrow \text{Li}^{3+}(g) + e^-$$ (Take the ionization energy for the H atom in the ground state as $$2.18 \times 10^{-18}$$ J atom$$^{-1}$$)

Given below are two statements : **Statement (I) :** The correct sequence of bond lengths in the following species is : $$O_2^+ < O_2 < O_2^- < O_2^{2-}$$ **Statement (II) :** The correct sequence of number of unpaired electrons in the following species is : $$O_2 > O_2^+ > O_2^- > O_2^{2-}$$ In the light of the above statements, choose the correct answer from the options given below :

Consider the following data.
(i) 2Al(s) + 6HCl(aq) → Al$$_2$$Cl$$_6$$(aq) + 3H$$_2$$(g) + 1200 kJ/mol
(ii) H$$_2$$(g) + Cl$$_2$$(g) → 2HCl(g) + 164 kJ/mol.
(iii) HCl(g) + aq → HCl(aq) + 83 kJ/mol.
(iv) Al$$_2$$Cl$$_6$$(s) + aq → Al$$_2$$Cl$$_6$$(aq) + 663 kJ/mol
The enthalpy of formation of anhydrous solid Al$$_2$$Cl$$_6$$ is :

19.5 g of fluoro acetic acid (molar mass = 78 g mol$$^{-1}$$) is dissolved in 500 g of water at 298 K. The depression in the freezing point was 1°C. What is K$$_a$$ of fluoro acetic acid? (For water, K$$_f$$ = 1.86 K kg mol$$^{-1}$$). Assume molarity and molality to have same values.

The solubility product constants of Ag$$_2$$CrO$$_4$$ and AgBr are 32x and 4y respectively at 298 K. The value of $$\left(\frac{\text{molarity of Ag}_2\text{CrO}_4}{\text{molarity of AgBr}}\right)$$ can be expressed as :

An electrochemical cell is constructed using half cells in the direction of spontaneous change
Fe(OH)$$_2$$(s) + 2e$$^-$$ → Fe(s) + 2OH$$^-$$(aq)       E$$^0$$ = −0.88 V
and AgBr(s) + e$$^-$$ → Ag(s) + Br$$^-$$(aq)                 E$$^0$$ = +0.07 V
Which of the following option is correct?

$$t_{100\%}$$ is the time required for the 100% completion of the reaction while $$t_{1/2}$$ is the time required for 50% of the reaction to be completed. Which of the following option correctly represents the relation between $$t_{100\%}$$ and $$t_{1/2}$$ for zero and first order reactions respectively?

Given below are two statements : **Statement (I) :** The first ionisation enthalpy of the elements Na, Mg, Cl and Ar follows the order Na > Mg > Cl > Ar. **Statement (II) :** Among Ca, Al, Fe and B, the third ionisation enthalpy is very high for Ca. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : **Statement (I) :** Oxidising power of halogens decreases in the order F$$_2$$ > Cl$$_2$$ > Br$$_2$$ > I$$_2$$, which is the basis of "Layer test". **Statement (II) :** "Layer test" to identify Br$$_2$$ and I$$_2$$ in aqueous solution involves the oxidation of bromide or iodide into Br$$_2$$ or I$$_2$$ respectively with Cl$$_2$$, which is a type of displacement redox reaction. In the light of the above statements, choose the correct answer from the options given below :