NTA JEE Main 26th August 2021 Shift 1

An aqueous KCl solution of density 1.20 g mL$$^{-1}$$ has a molality of 3.30 mol kg$$^{-1}$$. The molarity of the solution in mol L$$^{-1}$$ is _________ (The Nearest integer)
[Molar mass of KCl = 74.5 g]

AB$$_3$$ is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is _________ (Integer answer)

The Born-Haber cycle for KCl is evaluated with the following data:
$$\Delta_f H^{\ominus}$$ for KCl = $$-436.7$$ kJ mol$$^{-1}$$; $$\Delta_{sub} H^{\ominus}$$ for K = 89.2 kJ mol$$^{-1}$$;
$$\Delta_{ionization} H^{\ominus}$$ for K = 419.0 kJ mol$$^{-1}$$; $$\Delta_{electron gain} H^{\ominus}$$ for Cl$$_{(g)}$$ = $$-348.6$$ kJ mol$$^{-1}$$
$$\Delta_{bond} H^{\ominus}$$ for Cl$$_2$$ = 243.0 kJ mol$$^{-1}$$
The magnitude of lattice enthalpy of KCl in kJ mol$$^{-1}$$ is _________ (Nearest integer)

The OH$$^-$$ concentration in a mixture of 5.0 mL of 0.0504 M NH$$_4$$Cl and 2 mL of 0.0210 M NH$$_3$$ solution is $$x \times 10^{-6}$$ M. The value of $$x$$ is _________ (Nearest integer) [Given $$K_w = 1 \times 10^{-14}$$ and $$K_b = 1.8 \times 10^{-5}$$]

The ratio of number of water molecules in Mohr's salt and potash alum is _________ $$\times 10^{-1}$$. (Integer answer)

Of the following four aqueous solutions, the total number of those solutions whose freezing point is lower than that of 0.10 M C$$_2$$H$$_5$$OH is _________ (Integer answer)
(i) 0.10 M Ba$$_3$$(PO$$_4$$)$$_2$$
(ii) 0.10 M Na$$_2$$SO$$_4$$
(iii) 0.10 M KCl
(iv) 0.10 M Li$$_3$$PO$$_4$$

These are physical properties of an element:
(A) Sublimation enthalpy
(B) Ionisation enthalpy
(C) Hydration enthalpy
(D) Electron gain enthalpy
The total number of above properties that affect the reduction potential is _________ (Integer answer)

The following data was obtained for chemical reaction given below at 975 K.
$$2NO_{(g)} + 2H_{2(g)} \rightarrow N_{2(g)} + 2H_2O_{(g)}$$
[NO] = 8 $$\times 10^{-5}$$, [H$$_2$$] = 8 $$\times 10^{-5}$$, Rate = 7 $$\times 10^{-9}$$
[NO] = 24 $$\times 10^{-5}$$, [H$$_2$$] = 8 $$\times 10^{-5}$$, Rate = 2.1 $$\times 10^{-8}$$
[NO] = 24 $$\times 10^{-5}$$, [H$$_2$$] = 32 $$\times 10^{-5}$$, Rate = 8.4 $$\times 10^{-8}$$
The order of the reaction with respect to NO is _________ [Integer answer]

The number of 4f electrons in the ground state electronic configuration of Gd$$^{2+}$$ is _________ [Atomic number of Gd = 64]

The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, at pH 12.5 will be _________ (Integer answer)