21400.One mole of oxygen at 273 K and one mole of sulphur dioxide at 546 K are taken in two separate containers, then,
kinetic energy of O2 > kinetic energy of SO2
kinetic energy of O2 < kinetic energy of SO2
kinetic energy of both are equal
None of these
21401.For one mole of an ideal gas the slope of V vs. T curve at constant pressure of 2 atm is X lit mol–1 K–1. The value of the ideal universal gas constant ‘R’ in terms of X is
X lit atm mol–1K–1
X/2 lit atm mol–1K–1
2X lit atm mol–1K–1
2X atm lit–1mol–1K–1
21402.If 10–4 dm3 of water is introduced into a 1.0 dm3 flask at 300 K, how many moles of water are in the vapour phase when equilibrium is established?
(Given : Vapour pressure of H2O at 300 K is 3170 Pa; R = 8.314 J K–1 mol–1)
(Given : Vapour pressure of H2O at 300 K is 3170 Pa; R = 8.314 J K–1 mol–1)
1.27 × 10–3 mol
5.56 × 10–3 mol
1.53 × 10–2 mol
4.46 × 10–2 mol
21403.In two vessels of 1 L each at the same temperature 1 g of H2 and 1 g of CH4are taken, for these
Vrms values will be same
kinetic energy per/mol will be same
total kinetic energy will same
pressure will be same
21404.Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?
The most probable speed increases
The fraction of the molecules with the most probable speed increases
The distribution becomes broader
The area under the distribution curve remains the same as under the lower temperature
21405.What volume of oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1 litre of propane gas (C3H8) measured under the same conditions?
10 L
7 L
6 L
5 L
21406.‘n’ mole of an ideal gas at temperature T (in Kelvin) occupy ‘V’ litres of volume, exerting a pressure of ‘P’ atmospheres. What is its concentration (in mole.lit)? (R = gas constant)
P/RT
PT/R
RT/P
R/PT
21407.10g each of CH4 and O2 are kept in cylinders of same volume under same temperatures, give the pressure ratio of two gases.
2 : 1
1 : 4
2 : 3
3 : 4
21408.The hydrides of the first elements in groups 15 – 17, namely NH3, H2O and HF respectively show abnormally high values for melting and boiling points. This is due to
small size of N, O and F
the ability to form extensive intermolecular H–bonding
the ability to form extensive intramolecular H–bonding
effective van der Walls interaction
21409.A gas will approach ideal behaviour at
high temperature, low pressure
low temperature, high pressure
low temperature, low pressure
high temperature, high pressure
21410.4 grams of an ideal gas occupies 5.6035 liters of volume at 546 K and 2 atm pressure. What is its molecular weight?
4
16
32
64
21411.7.5 grams of a gas occupy 5.6 litres of volume at STP. The gas is (Atomic weights of C, N and O are 12, 14 and 16 respectively)
NO
N2O
CO
CO2
21412.5.5 mg of nitrogen gas dissolves in 180 g of water at 273 K and one atm pressure due to nitrogen gas. The mole fraction of nitrogen in 180 g of water at 5 atm nitrogen pressure is approximately
1 × 10–6
1 × 10–5
1 × 10–3
1 × 10–4
21413.The RMS velocity of an ideal gas at 300K is 12240 cm.s–1. What is its most probable velocity (in.cm.s–1) at the same temperature?
10000
11280
1000
12240
21414.A gas deviates from ideal behaviour at a high pressure because its molecules
attract one another
show the Tyndall effect
have kinetic energy
are bound by covalent bonds
21415.Dalton’s law of partial pressures is applicable to which one of the following systems?
CO + H2
H2 + Cl2
NO + O2
NH3 + HCl
21416.'a' and 'b' are van der Waals' constants for gases. Chlorine is more easily liquefied than ethane because
a for Cl2 > a for C2H6 but b for Cl2 < b for C2H6
a for Cl2 < a for C2H6 but b for Cl2 > b for C2H6
a and b for Cl2 > a and b for C2H6
a and b for Cl2 < a and b for C2H6
21417.Four gases P, Q, R and S have almost same values of ‘b’ but their ‘a’ values (a, b are van der Waals constants) are in the order Q < R < S < P. At a particular temperature, among the four gases the most easily liquefiable one is
P
Q
R
S
21418.At 100 K r.m.s velocity of a gas is 104 cm/sec hence at what temperature r.m.s velocity becomes 3 ×104 cm/sec?
900°C
327°C
627°C
127°C
21419.By what ratio the average velocity of the molecule in gas change when the temperature is raised from 50 to 200°C?
1.21/1
1.46/1
1.14/1
4/1