NTA JEE Mains 8th April Shift 2 2026

Number of paramagnetic complexes among the following is __________.
$$[\text{MnBr}_4]^{2-}$$, $$[\text{NiCl}_4]^{2-}$$, $$[\text{Ni(CN)}_4]^{2-}$$, $$[\text{Ni(CO)}_4]$$, $$[\text{CoF}_6]^{3-}$$, $$[\text{Fe(CN)}_6]^{4-}$$, $$[\text{Mn(CN)}_6]^{3-}$$, $$[\text{Ti(CN)}_6]^{3-}$$, $$[\text{Cu(H}_2\text{O)}_6]^{2+}$$, $$[\text{Co(C}_2\text{O}_4)_3]^{3-}$$

'$$x$$' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. '$$y$$' is the major product obtained from the benzene by reacting it with ethanoyl chloride in the presence of anhydrous AlCl$$_3$$. Product (major) obtained by heating $$x$$ and $$y$$ in the presence of alkali is $$z$$. Total number of $$\pi$$ (pi) electrons in $$z$$ is __________.

Consider two radiations of wavelengths
1. $$\lambda_1 = 2000$$ $$\text{\AA}$$
2. $$\lambda_2 = 6000$$ $$\text{\AA}$$
The ratio of the energies of these two radiations $$\left(\frac{E_1}{E_2}\right)$$ is __________ (Nearest integer).

Consider the reaction
$$2\text{H}_2\text{S(g)} + 3\text{O}_2\text{(g)} \to 2\text{H}_2\text{O(l)} + 2\text{SO}_2\text{(g)}$$
The magnitude of enthalpy change for the reaction in kJ mol$$^{-1}$$ is __________. (Nearest integer)
Given :
$$\Delta_f H^\ominus(\text{H}_2\text{S}) = -20.1$$ kJ mol$$^{-1}$$
$$\Delta_f H^\ominus(\text{H}_2\text{O}) = -286.0$$ kJ mol$$^{-1}$$
$$\Delta_f H^\ominus(\text{SO}_2) = -297.0$$ kJ mol$$^{-1}$$

Solid carbon, CaO and CaCO$$_3$$ are mixed and allowed to attain equilibrium at T K.
$$\text{CaCO}_3\text{(s)} \rightleftharpoons \text{CaO(s)} + \text{CO}_2\text{(g)} \quad K_{p_1} = 0.08$$ atm
$$\text{C(s)} + \text{CO}_2\text{(g)} \rightleftharpoons 2\text{CO(g)} \quad K_{p_2} = 2$$ atm
The partial pressure of CO is __________ $$\times 10^{-1}$$ atm