states-of-matter-quiz-1

States of Matter Quiz-1

Dear Readers,

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

(d) Follow Avogadro’s hypothesis.

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 (μ) is zero at inversion temperature Mathematically, μ=(∂T/∂p)_H When, μ=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) v_rms=√(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