1
JEE Main 2022 (Online) 28th June Evening Shift
Numerical
+4
-1
Change Language

For combustion of one mole of magnesium in an open container at 300 K and 1 bar pressure, $$\Delta$$CH$$\Theta $$ = $$-$$601.70 kJ mol$$-$$1, the magnitude of change in internal energy for the reaction is __________ kJ. (Nearest integer)

(Given : R = 8.3 J K$$-$$1 mol$$-$$1)

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2
JEE Main 2022 (Online) 28th June Evening Shift
Numerical
+4
-1
Change Language

2.5 g of protein containing only glycine (C2H5NO2) is dissolved in water to make 500 mL of solution. The osmotic pressure of this solution at 300 K is found to be 5.03 $$\times$$ 10$$-$$3 bar. The total number of glycine units present in the protein is ____________.

(Given : R = 0.083 L bar K$$-$$1 mol$$-$$1)

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3
JEE Main 2022 (Online) 28th June Evening Shift
Numerical
+4
-1
Change Language

For the given reactions

Sn2+ + 2e$$-$$ $$\to$$ Sn

Sn4+ + 4e$$-$$ $$\to$$ Sn

the electrode potentials are ; $$E_{S{n^{2 + }}/Sn}^o = - 0.140$$ V and $$E_{S{n^{4 + }}/Sn}^o = + 0.010$$ V. The magnitude of standard electrode potential for $$S{n^{4 + }}/S{n^{2 + }}$$ i.e. $$E_{S{n^{4 + }}/S{n^{2 + }}}^o$$ is _____________ $$\times$$ 10$$-$$2 V. (Nearest integer)

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4
JEE Main 2022 (Online) 28th June Evening Shift
Numerical
+4
-1
Change Language

A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is ___________. (Nearest integer)

(Given : antilog 0.125 = 1.333, antilog 0.693 = 4.93)

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