1
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

At 25$$^\circ$$C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are $$-$$ 3268 kJ mol$$-$$1 and $$-$$1300 kJ mol$$-$$1, respectively. The change in enthalpy for the reaction 3 C2H2(g) $$\to$$ C6H6 (I), is :

A
+324 kJ mol$$-$$1
B
+632 kJ mol$$-$$1
C
$$-$$ 632 kJ mol$$-$$1
D
$$-$$ 732 kJ mol$$-$$1
2
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2$$^\circ$$C. The percentage association of solute A in water, is :

[Given : Molar mass of A = 93 g mol$$-$$1. Molal depression constant of water is 1.86 K kg mol$$-$$1.]

A
50%
B
60%
C
70%
D
80%
3
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The Ksp for bismuth sulphide (Bi2S3) is 1.08 $$\times$$ 10$$-$$73. The solubility of Bi2S3 in mol L$$-$$1 at 298 K is :

A
1.0 $$\times$$ 10$$-$$15
B
2.7 $$\times$$ 10$$-$$12
C
3.2 $$\times$$ 10$$-$$10
D
4.2 $$\times$$ 10$$-$$8
4
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct order of electron gain enthalpies of Cl, F, Te and Po is

A
F < Cl < Te < Po
B
Po < Te < F < Cl
C
Te < Po < Cl < F
D
Cl < F < Te < Po
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