States of Matter PYQs Set 6 (PDF)

Set 6 of 7 · Questions 151-180 of 196

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Mere Teacher · Previous Year Questions NEET Chemistry · States of Matter · Set 6 (Q151-180)
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151. $In an experiment, it was found that for a gas at constant temperature, PV = C. The value of C depends on$ (1) $atmospheric pressure$ (2) $quantity of gas$ (3) $molecular weight of gas$ (4) $volume of chamber$ 152. $The variation of vapour pressure (b) as a function of temperature (a) is studied for C_{2} H_{5} OC_{2} H_{5}, CCl_{4} and H_{2} O at 760 mmHg and is shown in the figure below. The boiling temperatures of C_{2} H_{5} OC_{2} H_{5}, CCl_{4} and H_{2} O are 308,350 and 373 K respectively. Curves A, B, C respectively correspond to$ (1) $H_{2} O, C_{2} H_{5} OC_{2} H_{5}, CCl_{4}$ (2) $C_{2} H_{5} OC_{2} H_{5}, CCl_{4}, H_{2} O$ (3) $CCl_{4}, C_{2} H_{5} OC_{2} H_{5}, H_{2} O$ (4) $CCl_{4}, H_{2} O, C_{2} H_{5} OC_{2} H_{5}$ 153. $If two moles of an ideal gas at 546 K occupies a volume of 44.8 litres, the pressure must be -$ (1) $2 atm$ (2) $3 atm$ (3) $4 atm$ (4) $1 atm$ 154. $The volume of a gas increases by a factor of 2 while the pressure decreases by a factor of 3. Given that the number of moles is unaffected, the factor by which the temperature changes is :$ (1) $\frac{3}{2}$ (2) $3 \times 2$ (3) $\frac{2}{3}$ (4) $\frac{1}{2} \times 3$ 155. $When a gas is compressed at constant temperature :$ (1) $the speeds of the molecules increase$ (2) $the collisions between the molecules increase$ (3) $the speeds of the molecules decrease$ (4) $the collisions between the molecules decrease$ 156. $Two glass bulbs A and B at same temperature are connected by a very small tube having a stop-corck. Bulb A has a volume of 100 c m^{3} and contained the gas while bulb B was empty. On opening the stop-corck, the pressure fell down to 20%. The volume of the bulb B is :$ (1) $100 c m^{3}$ (2) $200 c m^{3}$ (3) $250 c m^{3}$ (4) $400 c m^{3}$ 157. $When a sample of gas kept at 20ºC and 4.0 atm is heated to 40ºC at constant volume$ (1) $average speed of the gas molecules will decrease.$ (2) $number of collisions between the gas molecules per second will remain the same.$ (3) $average kinetic energy of the gas will increase.$ (4) $pressure of the gas will become 8 atm.$ 158. $Among the gases a, b, c, d, e and f, the gases that show only positive deviation from ideal behavior at all pressures in the graph are$ (1) $b, c only$ (2) $b, c, a only$ (3) $d, e only$ (4) $d, e, f only$ 159. $Which one of the following is the correct PV vs P plot at constant temperature for an ideal gas? (P and V stand for pressure and volume of the gas respectively)$ (1) (2) (3) (4) 160. $Potassium hydroxide solutions are used to absorb C O_{2} . How many litres of C O_{2} at 1.00 atm and 22ºC would be absorbed by an aqueous solution containing 15.0 g of KOH ? (Take R = \frac{1}{12} λ atm / K/mole) 2KOH + C O_{2} \to K_{2} C O_{3} + H_{2} O$ (1) $3.24 L$ (2) $1.62 L$ (3) $6.48 L$ (4) $0.324 L$ 161. $At what temperature will the total KE of 0.3 mol of He be the same as the total KE of 0.40 mol of Ar at 400 K ?$ (1) $533 K$ (2) $400 K$ (3) $346 K$ (4) $300 K$ 162. $The unit of the van der Waals gas equation parameter ‘a’ in (P + \frac{an}{V ^{2}}) (V - nb) = n R T is :$ (1) $kg m s^{- 2}$ (2) $d m^{3} m o l^{- 1}$ (3) $kg m s^{- 1}$ (4) $atm d m^{6} m o l^{- 2}$ 163. $In the Vander waal equation of state for a non ideal gas the term that accounts for intermolecular force is$ (1) $(V - b)$ (2) $RT$ (3) $(P + \frac{a}{ν ^{2}})$ (4) $1/RT$ 164. $Which amongst the given plots is the correct plot for pressure (p) vs density (d) for an ideal gas ?$ (1) (2) (3) (4) 165. $Assuming ideal gas behaviour, the ratio of density of ammonia to that of hydrogen chlroide at same temperature and pressure is : (Atomic wt. of Cl 35.5 u)$ (1) $1.46$ (2) $1.64$ (3) $0.46$ (4) $0.64$ 166. $One mole of a gas is defined as -$ (1) $The number of molecules in one litre of gas$ (2) $The number of molecules in one formula weight of gas$ (3) $The number of molecules contained in 12 grams of (12 C) isotope$ (4) $The number of molecules in 22.4 litres of a gas at S.T.P.$ 167. (1) $A = C_{MPS}, B = C_{Average}, C =_{RMS}$ (2) $A = C_{Average,} B = C_{MPS}, C = C_{RMS}$ (3) $A = C_{RMS}, B = C_{Average}, C = C_{MPS}$ (4) $A = C_{MPS}, B = C_{RMS}, C = C_{Average}$ 168. $Under high pressure conitions, van der waal's equation for a real gas reduces to :$ (1) $PV = RT$ (2) $PV + a/V = RT$ (3) $PV - Pb = RT$ (4) $(P + a/ V^{2}) (V - b) = RT$ 169. $Which of the following is not an assumption of the kinetic theory of gases ?$ (1) $Gas particles have negligible volume$ (2) $A gas consists of many identical particels which are in continual motion$ (3) $At high pressure, gas particles are difficult to compress$ (4) $Collisions of gas particles are perfectly elastic$ 170. $A gas shows positive joule-thomson effect below :$ (1) $Critical temperature$ (2) $Boyle temperature$ (3) $Transition temperature$ (4) $Inversion temperature$ 171. $A mixture of gases O_{2}, H_{2} and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is:$ (1) (2) (3) (4) 172. $A flask of gaseous C C I_{4} was weighed at measured temperature and pressure. The flask was then flushed and filled with O_{2} at same temperature and pressure. The weight of the C C I_{4} vapour will be :$ (1) $five times as heavy as O_{2}$ (2) $one fifth heavy as compared to O_{2}$ (3) $same as that of O_{2}$ (4) $twice as heavy as the O_{2}$ 173. $The kinetic energy of one gram mole of any gas depends on :$ (1) $absolute temperature of the gas.$ (2) $nature of the gas molecules.$ (3) $pressure of the gas$ (4) $volume of the gas$ 174. $The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules, respectively is proportional to [r is the distance between the polar molecules]$ (1) $r^{3}; \frac{1}{r ^{2}}$ (2) $\frac{1}{r ^{3}}; \frac{1}{r ^{6}}$ (3) $\frac{1}{r ^{2}}; r^{2}$ (4) $\frac{1}{r ^{2}}; \frac{1}{r ^{4}}$ 175. $The initial volume of a gas cylinder is 750.0 mL. If the pressure of gas inside the cylinder changes from 840.0 mm Hg to 360.0 mm Hg, the final volume the gas will be :$ (1) $1.750 L$ (2) $3.60 L$ (3) $4.032 L$ (4) $7.50 L$ 176. $In the van der Waals equation of state for a real gas, the term that accounts for intermolecular attraction is$ (1) $(P + a/ V^{2})$ (2) $(V - b)$ (3) $RT$ (4) $1/(V - b).$ 177. $Equal masses of ethane and hydrogen gas are present in a container at 25ºC. The fraction of the total pressure exerted by ethane gas is :$ (1) $1/2$ (2) $1/16$ (3) $15/16$ (4) $1/8$ 178. $What is the total pressure inside a 2L vessel containing 1g of He, 14g of CO and 10g of NO at 27°C ?$ (1) $0.25 atm$ (2) $13.2 atm$ (3) $1.24 atm$ (4) $21.6 atm$ 179. $Which of the following is NOT a postulate of the kinetic molecular theory of gases?$ (1) $The molecules possess a volume that is negligibly small compared to the of the container.$ (2) $The pressure and volume of a gas are inversely related$ (3) $Gases consist of discrete particles that are in random motion$ (4) $The average kinetic energy of the molecules is directly proportional to the temperature$ 180. $Correct expression for density of an ideal gas mixture of two gases 1 and 2, where m_{1} and m_{2} are masses and n_{1} and n_{2} are moles and M_{1} and M_{2} are molar masses.$ (1) $d = \frac{( m _{1} + m _{2} )}{( M _{1} + M _{2} )}$ (2) $d = \frac{( m _{1} + m _{2} )}{( n _{1} + n _{2} )} \frac{P}{R T}$ (3) $d = \frac{( n _{1} + n _{2} )}{( m _{1} + m _{2} )} \times \frac{P}{R T}$ (4) $None of these$