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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.
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Q1. For the following reaction in gaseous phase CO+1/2 O2⟶CO2
Kc⁄Kp is
•  RT1⁄2
•  RT-1⁄2
•  (RT)
•  (RT)-1
Solution
(a) Kp=Kc(RT)(∆ng ) ∆ng=1-1.5=-0.5 Kp=K_c (RT)^((-1)⁄2)=Kc/(RT)(1⁄2) ∴ Kc/Kp =(RT)(1⁄2)

Q2.The change in pressure will not affect the equilibrium constant for
•  N2+3H2⇌2NH3
•  PCl5⇌PCl3+Cl2
•  H2+I2⇌2HI
•  All of these
Solution
(d) The change in pressure will not affect the equilibrium constant. Equilibrium constant changes with change in temperature.
Q3.  For which salt the pH of its solution does not change with dilution?
•  NH4Cl
•  CH3 COONH4
•  CH3COONa
•  None of these
Solution
b) pH of salts of weak acid and weak base is derived by the relation :[H+ ]=√(KH )=√(Kw/(Ka∙Kb ))

Q4. In a reversible reaction two substance are in equilibrium. If the concentration each one is doubled, the equilibrium constant will be
•  Reduced to one fourth of its original value
•  Reduced to half of its original value
•  Constant
•  Doubled
Solution
c) The equilibrium constant does not depend on concentration, when reversible reaction at equilibrium hence, equilibrium constant will be constant.

Q5.The reaction which proceeds in the forward direction is :
•  Fe2O3+6HCl=2FeCl3+3H2O
•  SnCl4+Hg2Cl2=SnCl2+2HgCl2
•  NH3+H2O+NaCl=NH4Cl+NaOH
•  2CuI+I2+4K+ =2Cu(2+)+3KI
Solution
(a) It is an acid-base reaction; Rest all occurs in reverse direction.

Q6.H3BO3 is:
•  Monobasic and weak Lewis acid
•  Monobasic and weak Bronsted acid
•  Monobasic and strong Lewis acid
•  Tribasic and weak Bronsted acid
Solution
(a) H3BO3 accepts OH- ions to act as weak monobasic Lewis acid. H3BO3+H2O⟶B(OH)4-+H+;K_a=10(-9)

Q7.The equilibrium constant, K for the reaction 2HI(g)⇌H2 (g)+I2 (g) At room temperature is 2.85 and that at 698 K, it is 1.4×10(-2). This implies that
•  HI is resonance stabilised
•  HI is exothermic compound
•  HI is stable at room temperature
•  HI is less stable than H2 and I2
Solution
d) Decrease of K with rise of temperature means that the forward reaction is exothermic. As the given reaction is exothermic, energy of HI is greater or stability is less than H2and I2

Q8.The aqueous solution of AlCl3 is acidic due to the hydrolysis of
•  Aluminum ion
•  Chloride ion
•  Both aluminium and chloride ion
•  None of the above
Solution
(a) Aqueous solution of AlCl_3 is acidic due to the hydrolysis of aluminium ion AlCl3Hydrolysis Al(OH)3+H+

Q9.The pH of blood is maintained by CO2 and H2CO3 in the body and chemical constituents of blood. This phenomenon
is called:
•  Colloidal
•  Buffer action
•  Acidity
•  Salt balance
Solution
(b) A buffer of H2CO3 and HCO3- is formed.

Q10. 10. The pH of a solution obtained by mixing 50 mL of 1 N HCl and 30 mL of 1 N NaOH is [log⁡2.5=0.3979]
•  3.979
•  0.6021
•  12.042
•  1.2042
Solution
b) Concentration of mixture #### Written by: AUTHORNAME

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BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE: CHEMISTRY CHEMICAL EQUILBRIUM QUIZ-1
CHEMISTRY CHEMICAL EQUILBRIUM QUIZ-1
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