## States of Matter Quiz-1

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..

Q1. The compressibility factor for H2 and He is usually:
•  >1
•  =1
•  <1
•  Either of these
Solution
(a) For H2 and He,PV>nRT;Also Z=PV/nRT

Q2.One mole of a gas is defined as:
•  The number of molecules in one litre of gas
•  The number of molecules in 2.24 litre of a gas
•  The number of atoms contained in 12g of C14 isotope
•  The number of molecules in 22.4 litre of a gas at STP
Solution

Q3. An AB2 type structure is found in
•  N2O
•  NaCl
•  Al2O3
•  CaF2
Solution
(d) CaF2

Q4. The joule Thomson coefficient is zero at
•  Absolute temperature
•  Critical temperature
•  Inversion temperature
•  Below 0℃
Solution
(c) Joule Thomson coefficient (Î¼) is zero at inversion temperature Mathematically, Î¼=(∂T/∂p)H When, Î¼=0, the gas neither gets cooled down nor gets heated upon expansion

Q5.The rms velocity of molecules of a gas of density 4 kg m-3 and pressure 1.2×105 Nm-2 is
•  300ms-1
•  900ms-1
•  120ms-1
•  600ms-1
Solution
(a) vrms=√(3p/d) =√((3×1.2×105)/4)=300 ms-1

Q6. CuSO4 aq. absorbs:
•  NH3
•  H2S
•  PH3
•  All of these
Solution
(d) CuSO4 (aq) reacts with all these gases.

Q7.Which defect causes decreases in the density of crystal?
•  Frenkel
•  Schottky
•  Interstitial
•  F-centre
Solution
(b) More is the Schottky defect in crystal, more is the decrease in density

Q8.The rate of effusion doesn’t depend on
•  The area of cross section of hole
•  Number of molecules per unit volume
•  The average molecular speed
•  Size of the molecule
Solution
(d) Effusion does not depend on size of the molecule

Q9.At NTP, 5.6 litre of a gas weighs 8 g. The vapour density of the gas is:
•  32
•  40
•  16
•  8
Solution
(c) Mol.wt.of gas=(8×22.4)/5.6=32; Also,vapour density=(Mol.wt.)/2=32/2=16

Q10. Two gas cylinders having same capacity have been filled with 44 g of H2 and 44 g of CO2 respectively. If the pressure in CO2 cylinder is 1 atm at a particular temperature, the pressure in the hydrogen cylinder at the same temperature is
•  2 atm
•  1 atm
•  22 atm
•  44 atm
Solution
(c) Partial pressure ∝moles of a gas Hence,  p1/p2 =x1/x2 1/p2  =(44/44)/(44/2) ∴p2 =44/2=22 atm

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