States of Matter AFCAT Questions

AFCAT Chemistry

States of Matter MCQ Questions


7.
The value of universal gas constant R in SI units is:
A.
1.987 cal K⁻¹ mol⁻¹
B.
0.0821 L atm K⁻¹ mol⁻¹
C.
8.314 J K⁻¹ mol⁻¹
D.
62.36 L Torr K⁻¹ mol⁻¹
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ANSWER :
C. 8.314 J K⁻¹ mol⁻¹
8.
Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain:
A.
Equal masses
B.
Equal kinetic energies per molecule
C.
Equal number of molecules
D.
Equal densities
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ANSWER :
C. Equal number of molecules
9.
Which of the following gases would deviate most from ideal gas behavior?
A.
NH₃ at low temperature and high pressure
B.
H₂ at room temperature
C.
He at high temperature and low pressure
D.
Ne at low pressure
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ANSWER :
A. NH₃ at low temperature and high pressure
10.
The compressibility factor Z for an ideal gas is:
A.
Less than 1
B.
Zero
C.
Equal to 1
D.
Greater than 1
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ANSWER :
C. Equal to 1
11.
The root mean square velocity of gas molecules is given by:
A.
√(8RT/πM)
B.
√(2RT/M)
C.
√(RT/M)
D.
√(3RT/M)
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ANSWER :
D. √(3RT/M)
12.
Among average velocity, most probable velocity, and rms velocity, the correct order is:
A.
v_mp = v_avg = v_rms
B.
v_avg < v_mp < v_rms
C.
v_rms < v_avg < v_mp
D.
v_mp < v_avg < v_rms
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ANSWER :
D. v_mp < v_avg < v_rms