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question_answer1)
As the temperature is raised from \[{{20}^{o}}C\] to \[{{40}^{o}}C\] the average kinetic energy of neon atoms changes by a factor of which of the following [AIEEE 2004]
A)
313/293 done
clear
B)
\[\sqrt{(313/293)}\] done
clear
C)
1/2 done
clear
D)
2 done
clear
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question_answer2)
A gas is found to have a formula\[{{[CO]}_{x}}\]. If its vapour density is 70, the value of \[x\] is [DCE 2004]
A)
2.5 done
clear
B)
3.0 done
clear
C)
5.0 done
clear
D)
6.0 done
clear
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question_answer3)
Which of the given sets of temperature and pressure will cause a gas to exhibit the greatest deviation from ideal gas behavior [DCE 2003]
A)
\[{{100}^{o}}C\] and 4 atm done
clear
B)
\[{{100}^{o}}C\] and 2 atm done
clear
C)
\[-{{100}^{o}}C\] and 4 atm done
clear
D)
\[{{0}^{o}}C\] and 2 atm done
clear
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question_answer4)
The molecular weight of \[{{O}_{2}}\] and \[S{{O}_{2}}\] are 32 and 64 respectively. If one litre of \[{{O}_{2}}\] at \[{{15}^{o}}C\] and 750 mm pressure contains 'N' molecules, the number of molecules in two litres of \[S{{O}_{2}}\] under the same conditions of temperature and pressure will be [CBSE 1990; MNR 1991]
A)
\[N/2\] done
clear
B)
N done
clear
C)
2N done
clear
D)
4N done
clear
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question_answer5)
What is the relationship between the average velocity (v), root mean square velocity (u) and most probable velocity a [AFMC 1994]
A)
\[\alpha :v:u::1:1.128:1.224\] done
clear
B)
\[\alpha :v:u::1.128:1:1.224\] done
clear
C)
\[\alpha :v:u::1.128:1.224:1\] done
clear
D)
\[\alpha :v:u::1.124:1.228:1\] done
clear
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question_answer6)
Consider the following statements : For diatomic gases, the ratio \[{{C}_{p}}/{{C}_{v}}\] is equal to (1) 1.40 (lower temperature) (2) 1.66 (moderate temperature) (3) 1.29 (higher temperature) which of the above statements are correct
A)
1, 2 and 3 done
clear
B)
1 and 2 done
clear
C)
2 and 3 done
clear
D)
1 and 3 done
clear
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question_answer7)
The compressibility factor for an ideal gas is [MP PET 2004]
A)
1.5 done
clear
B)
1.0 done
clear
C)
2.0 done
clear
D)
\[\infty \] done
clear
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question_answer8)
The compressibility factor of a gas is less than 1 at STP. Its molar volume \[{{V}_{m}}\] will be [MP PET 2004]
A)
\[{{V}_{m}}>\] 22.42 done
clear
B)
\[{{V}_{m}}<\]22.42 done
clear
C)
\[{{V}_{m}}=\]22.42 done
clear
D)
None done
clear
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question_answer9)
If some moles of \[{{O}_{2}}\] diffuse in 18 sec and same moles of other gas diffuse in 45 sec then what is the molecular weight of the unknown gas [CPMT 1988]
A)
\[\frac{{{45}^{2}}}{{{18}^{2}}}\times 32\] done
clear
B)
\[\frac{{{18}^{2}}}{{{45}^{2}}}\times 32\] done
clear
C)
\[\frac{{{18}^{2}}}{{{45}^{2}}\times 32}\] done
clear
D)
\[\frac{{{45}^{2}}}{{{18}^{2}}\times 32}\] done
clear
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question_answer10)
The ratio of rates of diffusion of \[S{{O}_{2}},\,{{O}_{2}}\] and \[C{{H}_{4}}\] is [BHU 1992]
A)
\[1:\sqrt{2}:2\] done
clear
B)
1 : 2 : 4 done
clear
C)
\[2:\sqrt{2}:1\] done
clear
D)
\[1:2:\sqrt{2}\] done
clear
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question_answer11)
If \[{{C}_{1}},\,{{C}_{2}},\,{{C}_{3}}......\]represent the speeds of \[{{n}_{1}},\,{{n}_{2}},\,{{n}_{3}}.....\] molecules, then the root mean square speed is [IIT 1993]
A)
\[{{\left( \frac{{{n}_{1}}C_{1}^{2}+{{n}_{2}}C_{2}^{2}+{{n}_{3}}C_{3}^{2}+.....}{{{n}_{1}}+{{n}_{2}}+{{n}_{3}}+.....} \right)}^{1/2}}\] done
clear
B)
\[\frac{{{({{n}_{1}}C_{1}^{2}+{{n}_{2}}C_{2}^{2}+{{n}_{3}}C_{3}^{2}+.....)}^{1/2}}}{{{n}_{1}}+{{n}_{2}}+{{n}_{3}}+.....}\] done
clear
C)
\[\frac{{{({{n}_{1}}C_{1}^{2})}^{1/2}}}{{{n}_{1}}}+\frac{{{({{n}_{2}}C_{2}^{2})}^{1/2}}}{{{n}_{2}}}+\frac{{{({{n}_{3}}C_{3}^{2})}^{1/2}}}{{{n}_{3}}}+......\] done
clear
D)
\[{{\left[ \frac{{{({{n}_{1}}{{C}_{1}}+{{n}_{2}}{{C}_{2}}+{{n}_{3}}{{C}_{3}}+....)}^{2}}}{({{n}_{1}}+{{n}_{2}}+{{n}_{3}}+....)} \right]}^{1/2}}\] done
clear
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question_answer12)
50 ml of hydrogen diffuses out through a small hole from a vessel in 20 minutes. The time needed for 40 ml of oxygen to diffuse out is [CBSE PMT 1994]
A)
12 min done
clear
B)
64 min done
clear
C)
8 min done
clear
D)
32 min done
clear
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question_answer13)
At what temperature will the average speed of \[C{{H}_{4}}\]molecules have the same value as \[{{O}_{2}}\] has at 300 K [CBSE PMT 1989]
A)
1200 K done
clear
B)
150 K done
clear
C)
600 K done
clear
D)
300 K done
clear
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question_answer14)
A sample of \[{{O}_{2}}\] gas is collected over water at \[{{23}^{o}}C\] at a barometric pressure of 751 mm Hg (vapour pressure of water at \[{{23}^{o}}C\] is 21 mm Hg). The partial pressure of \[{{O}_{2}}\] gas in the sample collected is [CBSE PMT 1993]
A)
21 mm Hg done
clear
B)
751 mm Hg done
clear
C)
0.96 atm done
clear
D)
1.02 atm done
clear
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question_answer15)
In an experiment during the analysis of a carbon compound, 145 \[l\] of \[{{H}_{2}}\] was collected at 760 mm Hg pressure and \[{{27}^{o}}C\] temperature. The mass of \[{{H}_{2}}\] is nearly [MNR 1987]
A)
10 g done
clear
B)
12 g done
clear
C)
24 g done
clear
D)
6 g done
clear
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question_answer16)
The volume of 1 g each of methane \[(C{{H}_{4}})\], ethane \[({{C}_{2}}{{H}_{6}})\], propane\[({{C}_{3}}{{H}_{8}})\] and butane \[({{C}_{4}}{{H}_{10}})\] was measured at 350 K and 1 atm. What is the volume of butane [NCERT 1981]
A)
495 \[c{{m}^{3}}\] done
clear
B)
600 \[c{{m}^{3}}\] done
clear
C)
900 \[c{{m}^{3}}\] done
clear
D)
1700 \[c{{m}^{3}}\] done
clear
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question_answer17)
The ratio of the rate of diffusion of helium and methane under identical condition of pressure and temperature will be [IIT 2005]
A)
4 done
clear
B)
2 done
clear
C)
1 done
clear
D)
0.5 done
clear
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question_answer18)
At what temperature in the celsius scale, V (volume) of a certain mass of gas at \[{{27}^{o}}C\] will be doubled keeping the pressure constant [Orissa 1993]
A)
\[{{54}^{o}}C\] done
clear
B)
\[{{327}^{o}}C\] done
clear
C)
\[{{427}^{o}}C\] done
clear
D)
\[{{527}^{o}}C\] done
clear
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question_answer19)
Pressure of a mixture of 4 g of \[{{O}_{2}}\] and 2 g of \[{{H}_{2}}\] confined in a bulb of 1 litre at \[{{0}^{o}}C\] is [AIIMS 2000]
A)
25.215 atm done
clear
B)
31.205 atm done
clear
C)
45.215 atm done
clear
D)
15.210 atm done
clear
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question_answer20)
If pressure becomes double at the same absolute temperature on 2 L\[C{{O}_{2}}\], then the volume of \[C{{O}_{2}}\] becomes [AIIMS 1992]
A)
2 L done
clear
B)
4 L done
clear
C)
25 L done
clear
D)
1 L done
clear
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question_answer21)
Volume of the air that will be expelled from a vessel of 300 \[c{{m}^{3}}\] when it is heated from \[{{27}^{o}}C\] to \[{{37}^{o}}C\] at the same pressure will be
A)
310 \[c{{m}^{3}}\] done
clear
B)
290 \[c{{m}^{3}}\] done
clear
C)
10 \[c{{m}^{3}}\] done
clear
D)
37 \[c{{m}^{3}}\] done
clear
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question_answer22)
300 ml of a gas at \[{{27}^{o}}C\] is cooled to \[-{{3}^{o}}C\] at constant pressure, the final volume is [NCERT 1981, MP PMT 1992]
A)
540 ml done
clear
B)
135 ml done
clear
C)
270 ml done
clear
D)
350 ml done
clear
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