NTA JEE Main 2025 April 3rd Shift 1

0.5 g of an organic compound on combustion gave 1.46 g of $$CO_2$$ and 0.9 g of $$H_2O$$. The percentage of carbon in the compound is _________. (Nearest integer)
[Given : Molar mass (in g mol$$^{-1}$$) C : 12, H : 1, O : 16]

The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is _________.
$$FeCl_3 + KOH + H_2C_2O_4 \to A$$

Given :
$$\Delta H^{\ominus}_{\text{sub}}[C(\text{graphite})] = 710$$ kJ mol$$^{-1}$$
$$\Delta_{C-H} H^{\ominus} = 414$$ kJ mol$$^{-1}$$
$$\Delta_{H-H} H^{\ominus} = 436$$ kJ mol$$^{-1}$$
$$\Delta_{C=C} H^{\ominus} = 611$$ kJ mol$$^{-1}$$

The $$\Delta H_f^{\ominus}$$ for $$CH_2=CH_2$$ is _________ kJ mol$$^{-1}$$
(nearest integer value)

Consider the following reactions
$$A + NaCl + H_2SO_4 \to CrO_2Cl_2 + \text{Side Products}$$ (Little amount)
$$CrO_2Cl_{2(Vapour)} + NaOH \to B + NaCl + H_2O$$
$$B + H^+ \to C + H_2O$$

The number of terminal 'O' present in the compound 'C' is _________.

In the following system,
$$PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$$ at equilibrium, upon addition of xenon gas at constant T & p, the concentration of