NTA JEE Main 26th June 2022 Shift 1

On complete combustion $$0.30$$ g of an organic compound gave $$0.20$$ g of carbon dioxide and $$0.10$$ g of water. The percentage of carbon in the given organic compound is ______ (Nearest Integer)

For complete combustion of methanol
$$CH_3OH(l) + \frac{3}{2}O_2(g) \to CO_2(g) + 2H_2O(l)$$
the amount of heat produced as measured by bomb calorimeter is $$726$$ kJ mol$$^{-1}$$ at $$27°$$C. The enthalpy of combustion for the reaction is $$-x$$ kJ mol$$^{-1}$$, where $$x$$ is ______
(Given : $$R = 8.3$$ J K$$^{-1}$$ mol$$^{-1}$$)

$$50$$ mL of $$0.1$$ M $$CH_3COOH$$ is being titrated against $$0.1$$ M NaOH. When $$25$$ mL of NaOH has been added, the pH of the solution will be ______ $$\times 10^{-2}$$. (Nearest integer)
(Given : $$pK_a(CH_3COOH) = 4.76$$)

Compound 'P' on nitration with dil. $$HNO_3$$ yields two isomers (A) and (B). These isomers can be separated by steam distillations. Isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. $$HNO_3$$ yields a yellow compound 'C', a strong acid. The number of oxygen atoms is present in compound 'C'

A $$0.5$$ percent solution of potassium chloride was found to freeze at $$-0.24°$$C. The percentage dissociation of potassium chloride is (Nearest integer)
(Molal depression constant for water is $$1.80$$ K kg mol$$^{-1}$$ and molar mass of KCl is $$74.6$$ g mol$$^{-1}$$)

A flask is filled with equal moles of A and B. The half lives of A and B are $$100$$ s and $$50$$ s respectively and are independent of the initial concentration. The time required for the concentration of A to be four times that of B is ______ s.
(Given : $$\ln 2 = 0.693$$)

$$2.0$$ g of $$H_2$$ gas is adsorbed on $$2.5$$ g of platinum powder at $$300$$ K and $$1$$ bar pressure. The volume of the gas adsorbed per gram of the adsorbent is ______ mL
(Given : $$R = 0.083$$ L bar K$$^{-1}$$ mol$$^{-1}$$)

The spin-only magnetic moment value of the most basic oxide of vanadium among $$V_2O_3$$, $$V_2O_4$$ and $$V_2O_5$$ is ______ B.M. (Nearest integer)

The spin-only magnetic moment value of an octahedral complex among $$CoCl_3 \cdot 4NH_3$$, $$NiCl_2 \cdot 6H_2O$$ and $$PtCl_4 \cdot 2HCl$$, which upon reaction with excess of $$AgNO_3$$ gives 2 moles of AgCl is ______ B.M. (Nearest Integer)

The number of oxygen present in a nucleotide formed from a base, that is present only in RNA is ______