NTA JEE Mains 31st Jan 2024 Shift 2

The molarity of 1 L orthophosphoric acid $$H_3PO_4$$ having 70% purity by weight (specific gravity 1.54 g cm$$^{-3}$$) is ______ M. (Molar mass of $$H_3PO_4 = 98$$ g mol$$^{-1}$$)

A diatomic molecule has a dipole moment of 1.2 D. If the bond distance is 1 $$\mathring{A}$$, then fractional charge on each atom is ______ $$\times 10^{-1}$$ esu. (Given 1D = $$10^{-18}$$ esu cm)

If 5 moles of an ideal gas expands from 10 L to a volume of 100 L at 300 K under isothermal and reversible condition then work, $$w$$, is $$-x$$ J. The value of $$x$$ is (Given $$R = 8.314$$ J K$$^{-1}$$ mol$$^{-1}$$)

Number of isomeric products formed by monochlorination of 2-methylbutane in presence of sunlight is

The values of conductivity of some materials at 298.15 K in S m$$^{-1}$$ are $$2.1 \times 10^3$$, $$1.0 \times 10^{-16}$$, $$1.2 \times 10$$, $$3.91$$, $$1.5 \times 10^{-2}$$, $$1 \times 10^{-7}$$, $$1.0 \times 10^3$$. The number of conductors among the materials is

$$r = kA$$ for a reaction, 50% of A is decomposed in 120 minutes. The time taken for 90% decomposition of A is ______ minutes.

Number of moles of $$H^+$$ ions required by 1 mole of $$MnO_4^-$$ to oxidise oxalate ion to $$CO_2$$ is

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is +

A compound $$x$$ with molar mass 108 g mol$$^{-1}$$ undergoes acetylation to give product with molar mass 192 g mol$$^{-1}$$. The number of amino groups in the compound $$x$$ is

From the vitamins $$A, B_1, B_6, B_{12}, C, D, E$$ and $$K$$, the number of vitamins that can be stored in our body is