NTA JEE Main 10th April 2019 Shift 1

The principle of column chromatography is:

The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is:

The regions of the atmosphere, where clouds form and where we live, respectively, are:

At room temperature, a dilute solution of urea is prepared by dissolving 0.60 g of urea in 360 g of water. If the vapour pressure of pure water at this temperature is 35 mm Hg, lowering of vapour pressure will be:
(molar mass of urea = 60 g mol$$^{-1}$$)

Consider the statements S1 and S2:
S1: Conductivity always increases with decreases in the concentration of electrolyte.
S2: Molar conductivity always increases with decreases in the concentration of electrolyte.
The correct option among the following

A bacterial infection in an internal wound grows as N'(t) = N$$_0$$exp(t), where the time t is in hours. A dose of antibiotic, taken orally, needs 1 hour to reach the wound. Once it reaches there, the bacterial population goes down as $$\frac{dN}{dt} = -5N^2$$. What will be the plot of $$\frac{N_0}{N}$$ vs t after 1 hour?

A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation
$$\frac{x}{m} = kp^{0.5}$$
Adsorption of the gas increases with:

Match the refining methods (Column I) with metals (Column II).
      Column I                       Column II
(Refining methods)              (Metals)
(I)   Liquation                      (a) Zr
(II)  Zone Refining                (b) Ni
(III) Mond Process                (c) Sn
(IV) Van Arkel Method          (d) Ga

The oxoacid of sulphur that does not contain bond between sulphur atom is:

Consider the hydrated ions of Ti$$^{2+}$$, V$$^{2+}$$, Ti$$^{3+}$$ and Sc$$^{3+}$$. The correct order of their spin-only magnetic moments is: