States of Matter · JEE Main previous year questions

2019 7 questions

1. Q842019 · 10 Apr 2019 · Shift 1

   Consider the following table : | Gas | $a/(\mathrm{k}\mathrm{Pa}\mathrm{d}{\mathrm{m}}^6\mathrm{mo}{\mathrm{l}}^{-1})$ | $b/(\mathrm{d}{\mathrm{m}}^3\mathrm{mo}{\mathrm{l}}^{-1})$ | |---|---|---| | A | 642.32 | 0.05196 | | B | 155.21 | 0.04136 | | C | 431.91 | 0.05196 | | D | 155.21 | 0.4382 | a and b are van der Waals constants. The correct statement about the gases is :

   1. A.Gas C will occupy more volume than gas A; gas B will be more compressible than gas D
   2. B.Gas C will occupy lesser volume than gas A; gas B will be more compressible than gas D
   3. C.Gas C will occupy lesser volume than gas A; gas B will be lesser compressible than gas D
   4. D.Gas C will occupy more volume than gas A; gas B will be lesser compressible than gas D
   Show answer

   Answer: A

2. Q882019 · 9 Apr 2019 · Shift 1

   Consider the van der Waals constants, a and b, for the following gases. $$\begin{array}{lcccc}\text{Gas}& \text{Ar}& \text{Ne}& \text{Kr}& \text{Xe}\\ a/(\mathrm{atm}\mathrm{d}{\mathrm{m}}^6\mathrm{mo}{\mathrm{l}}^{-2})& 1.3& 0.2& 5.1& 4.1\\ b/(10^{-2}\mathrm{d}{\mathrm{m}}^3\mathrm{mo}{\mathrm{l}}^{-1})& 3.2& 1.7& 1.0& 5.0\end{array}$$ Which gas is expected to have the highest critical temperature?

   1. A.Ne
   2. B.Kr
   3. C.Xe
   4. D.Ar
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   Answer: B

3. Q862019 · 9 Apr 2019 · Shift 2

   At a given temperature T, gases Ne, Ar, Xe and Kr are found to deviate from ideal gas behaviour. Their equation of state is given as $p=\frac{RT}{V-b}$ at T. Here, b is the van der Waals constant. Which gas will exhibit steepest increase in the plot of Z (compression factor) vs p?

   1. A.Xe
   2. B.Ne
   3. C.Ar
   4. D.Kr
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   Answer: A

4. Q702019 · 12 Jan 2019 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: D

5. Q842019 · 12 Jan 2019 · Shift 1

   Given | Gas | ${\mathrm{H}}_2$ | $\mathrm{C}{\mathrm{H}}_4$ | $\mathrm{C}{\mathrm{O}}_2$ | $\mathrm{S}{\mathrm{O}}_2$ | | :--- | :--- | :--- | :--- | :--- | | Critical Temperature / K | 33 | 190 | 304 | 630 | On the basis of data given above, predict which of the following gases shows least adsorption on a definite amount of charcoal ?

   1. A.$\mathrm{S}{\mathrm{O}}_2$
   2. B.$\mathrm{C}{\mathrm{H}}_4$
   3. C.${\mathrm{H}}_2$
   4. D.$\mathrm{C}{\mathrm{O}}_2$
   Show answer

   Answer: C

6. Q652019 · 12 Jan 2019 · Shift 2
   
   1. A.A and D
   2. B.B and D
   3. C.B and C
   4. D.A and C
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   Answer: B

7. Q852019 · 12 Jan 2019 · Shift 2

   An open vessel at $27^{\circ }\mathrm{C}$ is heated until two fifth of the air (assumed as an ideal gas) in it has escaped from the vessel. Assuming that the volume of the vessel remains constant, the temperature at which the vessel has been heated is -

   1. A.750 K
   2. B.$500^{\circ }\mathrm{C}$
   3. C.$750^{\circ }\mathrm{C}$
   4. D.500 K
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   Answer: D