question_answer 1) 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
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B) \[\sqrt{(313/293)}\] done
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C) 1/2 done
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D) 2 done
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question_answer 2) 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
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B) 3.0 done
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C) 5.0 done
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D) 6.0 done
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question_answer 3) 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
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B) \[{{100}^{o}}C\] and 2 atm done
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C) \[-{{100}^{o}}C\] and 4 atm done
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D) \[{{0}^{o}}C\] and 2 atm done
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question_answer 4) 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
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B) N done
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C) 2N done
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D) 4N done
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question_answer 5) 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
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B) \[\alpha :v:u::1.128:1:1.224\] done
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C) \[\alpha :v:u::1.128:1.224:1\] done
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D) \[\alpha :v:u::1.124:1.228:1\] done
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question_answer 6) 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
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B) 1 and 2 done
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C) 2 and 3 done
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D) 1 and 3 done
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question_answer 7) The compressibility factor for an ideal gas is [MP PET 2004]
A) 1.5 done
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B) 1.0 done
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C) 2.0 done
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D) \[\infty \] done
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question_answer 8) 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
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B) \[{{V}_{m}}<\]22.42 done
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C) \[{{V}_{m}}=\]22.42 done
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D) None done
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question_answer 9) 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
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B) \[\frac{{{18}^{2}}}{{{45}^{2}}}\times 32\] done
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C) \[\frac{{{18}^{2}}}{{{45}^{2}}\times 32}\] done
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D) \[\frac{{{45}^{2}}}{{{18}^{2}}\times 32}\] done
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question_answer 10) 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
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B) 1 : 2 : 4 done
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C) \[2:\sqrt{2}:1\] done
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D) \[1:2:\sqrt{2}\] done
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question_answer 11) 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
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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
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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
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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
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question_answer 12) 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
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B) 64 min done
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C) 8 min done
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D) 32 min done
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question_answer 13) 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
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B) 150 K done
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C) 600 K done
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D) 300 K done
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question_answer 14) 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
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B) 751 mm Hg done
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C) 0.96 atm done
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D) 1.02 atm done
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question_answer 15) 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
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B) 12 g done
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C) 24 g done
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D) 6 g done
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question_answer 16) 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
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B) 600 \[c{{m}^{3}}\] done
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C) 900 \[c{{m}^{3}}\] done
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D) 1700 \[c{{m}^{3}}\] done
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question_answer 17) 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
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B) 2 done
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C) 1 done
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D) 0.5 done
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question_answer 18) 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
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B) \[{{327}^{o}}C\] done
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C) \[{{427}^{o}}C\] done
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D) \[{{527}^{o}}C\] done
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question_answer 19) 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
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B) 31.205 atm done
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C) 45.215 atm done
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D) 15.210 atm done
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question_answer 20) 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
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B) 4 L done
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C) 25 L done
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D) 1 L done
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question_answer 21) 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
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B) 290 \[c{{m}^{3}}\] done
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C) 10 \[c{{m}^{3}}\] done
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D) 37 \[c{{m}^{3}}\] done
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question_answer 22) 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
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B) 135 ml done
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C) 270 ml done
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D) 350 ml done
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