1
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
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.
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2
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
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)

Give : 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
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3
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
The vapour pressures of A and B at 25$$^\circ$$C are 90 mm Hg 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)
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4
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
4g equimolar mixture of NaOH and Na2CO3 contains x g of NaOH and y g of Na2CO3. The value of x is ____________ g. (Nearest integer)
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