NTA JEE Main 20th July 2021 Shift 2

The wavelength of electrons accelerated from rest through a potential difference of 40 kV is X $$\times 10^{-12}$$ m. The value of X is. (Nearest integer)
Given: Mass of electron = 9.1 $$\times 10^{-31}$$ kg
Charge on an electron = 1.6 $$\times 10^{-19}$$ C
Planck's constant = 6.63 $$\times 10^{-34}$$ Js

For a given chemical reaction A $$\to$$ B at 300 K the free energy change is -49.4 kJ mol$$^{-1}$$ and the enthalpy of reaction is 51.4 kJ mol$$^{-1}$$. The entropy change of the reaction is ___ JK$$^{-1}$$ mol$$^{-1}$$.

4 g equimolar mixture of NaOH and Na$$_2$$CO$$_3$$ contains xg of NaOH and yg of Na$$_2$$CO$$_3$$. The value of x is ___g. (Nearest integer)

When 0.15 g of an organic compound was analyzed using Carius method for estimation of bromine, 0.2397 g of AgBr was obtained. The percentage of bromine in the organic compound is ___. (Nearest integer)
[Atomic mass : Silver = 108, Bromine = 80]

Diamond has a three dimensional structure of C atoms formed by covalent bonds. The structure of diamond has face centred cubic lattice where 50% of the tetrahedral voids are also occupied by carbon atoms. The number of carbon atoms present per unit cell of diamond is ___.

The vapour pressures of A and B at 25$$^\circ$$C are 90 mmHg and 15 mm Hg respectively. If A and B are mixed such that the mole fraction of A in the mixture is 0.6, then the mole fraction of B in the vapour phase is $$x \times 10^{-1}$$. The value of x is ___. (Nearest integer)

Potassium chlorate is prepared by electrolysis of KCl in basic solution as shown by following equation.
6 OH$$^-$$ + Cl$$^- \to$$ ClO$$_3^-$$ + 3H$$_2$$O + 6e$$^-$$
A current of xA has to be passed for 10 h to produce 10.0 g of potassium chlorate. The value of x is ___. (Nearest integer)
(Molar mass of KClO$$_3$$ = 122.6 g mol$$^{-1}$$, F = 96500 C)

PCl$$_5$$(g) $$\to$$ PCl$$_3$$(g) + Cl$$_2$$(g)
In the above first order reaction the concentration of PCl$$_5$$ reduces from initial concentration 50 mol L$$^{-1}$$ to 10 mol L$$^{-1}$$ in 120 minutes at 300 K. The rate constant for the reaction at 300 K is x $$\times 10^{-2}$$ min$$^{-1}$$. The value of x is ___.
[Given log 5 = 0.6989]

For coagulation of 50 mL of a sol, 10 mL of 0.5M Cl$$^-$$ ion solution is required. What is the coagulating value of Cl$$^-$$ ion solution (Nearest integer)

An aqueous solution of NiCl$$_2$$ was heated with excess sodium cyanide in presence of strong oxidizing agent to form [Ni(CN)$$_6$$]$$^{2-}$$. The total change in number of unpaired electrons on metal centre is ___.