NEET MCQ on State of Matter

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Questions
1 If the temperature is doubled, the average velocity of a gaseous molecule increases by
A 4
B 1.4
C 2
D 2.8

Answer:1.4
2 What are the conditions for gas like Carbon monoxide to obey the ideal gas laws?
A low temperature and low pressure
B low temperature and high pressure
C high temperature and low pressure
D high temperature and high pressure

Answer:high temperature and low pressure
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3 A container with a pin-hole contains equal moles of H2(g) and O2(g). Find the fraction of oxygen gas escaped at the same time when one-fourth of hydrogen gas escapes
A 1/16
B 1/4
C 1/2
D 1/8

Answer:1/16
4 __________ can be readily liquefied when ‘a’ for NH3 is 4.17, SO2 is 6.71, CO2 is 3.59 and Cl2 is 6.49.
A CO2
B NH3
C Cl2
D SO2

Answer:SO2
5 Which of these will have the highest rate of diffusion, if they are in the same container and at the same temperature?
A 56g N2
B 4g H2
C 22g CO2
D 32g O2

Answer:4g H2
6 _________ is the % of gas which remains in an open container when it is heated from 300 K to 400 K.
A 100%
B 75%
C 50%
D 25%

Answer: 75%
7 Which of these is Vander Waals’ equation for a real gas?
A (P +a/V2) (V-b) = RT
B P=nRT/ V – nB – an2/ V2
C (P=n2a/V2) (V-nb) = nRt
D All of these

Answer:All of these
8 ________ is the numerical value of Cp - Cv.
A R
B M/R
C R/M
D None of these

Answer:R
9 When 600 cc of gas is compressed to 500 cc at a pressure of 750 mm. Given the temperature is kept constant, the pressure would increase by:
A 350 mm.
B 250 mm.
C 450 mm.
D 150 mm.

Answer:150 mm.
10 ‘Air at sea level is dense.’ – It is a practical application of _________.
A Charles’ Law.
B Dalton’s Law.
C Boyle’s Law.
D Avogadro’s Law.

Answer:Boyle’s Law.
11 Which of these is the partial pressure of dry gas?
A Equivalent to the partial pressure of the wet gas.
B Lesser than the wet gas.
C Greater than the wet gas.
D None of these.

Answer:Lesser than the wet gas.
12 When ____ is passed through diluted blood, it imparts a cherry-red colour to it.
A CO
B NH3
C CO2
D COCl2

Answer:CO
13 What happens to the mean free path with an increase in pressure?
A Increases
B Decreases
C Remains the same.
D Becomes zero.

Answer:Decreases
14 The Vander Waals’ force in hydrogen and helium are ________.
A Very strong.
B Strong.
C Weak.
D None of these.

Answer:Weak
15 All gases except He and H2 exhibit __________ at a lower temperature.
A Positive deviation
B Positive deviation and negative deviation
C Negative deviation
D None of these

Answer:Negative deviation
16 _________________ makes carbon dioxide obey the ideal gas laws.
A High temperature and low pressure
B Low temperature and a high pressure
C High temperature and a high pressure
D Low temperature and low pressure

Answer:High temperature and low pressure
17 Which of these is the reason why an ideal gas does not liquefy?
A Its molecules are smaller in size.
B There is a negligible force between its molecules.
C It solidifies.
D Its temperature is above 0°.

Answer:There is a negligible force between its molecules.
18 Beans cook faster in a pressure cooker because:
A The extra pressure softens the beans.
B When pressure increases, the boiling point also increases.
C When pressure increases boiling point decreases.
D Internal energy does not get lost while cooking.

Answer:When pressure increases, the boiling point also increases.
19 Which of these is the unit of constant ‘b’ in Vander Waals’ equation?
A cm3 mol-1
B m3 mol-1
C litre mol-1
D all of these

Answer:all of these
20 Which of these is the unit of constant ‘a’ in Vander Waals’ equation?
A dyne cm4 mol-2
B Newton m4 mol-2
C atm litre2 mol-2
D All of these

Answer:All of these

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