## CHEMISTRY CHEMICAL EQUILBRIUM QUIZ-7

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 system; 3A+2B⇌C, the expression for equilibrium constant is
•  ([A]3[B]2)/[C]
•  [C]/([A]3[B]2)
•  [3A][2B]/[C]
•  [C]/[3A][2B]
Solution
b)Equilibrium constant for the reaction, 3A+2B⇌C, is K=([C])/([A]3 [B]2 )

Q2.At 600℃,Kp for the following reaction is 1 atm.
X(g)⇌Y(g)+Z(g)
At equilibrium, 50% of X(g) is dissociated. The total pressure of the equilibrium system is p atm.
What is the partial pressure (in atm) of X(g) at equilibrium?
•   1
•  4
•  2
•  0.5
Solution
(a) X(g) ⇌ Y(g) Z(g)
Initial 1 0 0
At equilibrium 0.5 0.5 0.5
Partial pressure 0.5/1.5 p 0.5/1.5 p 0.5/1.5 p
∵ Kp (pY.pZ)/px
1 (p/3 p/3)/(p/3)
p 3 atm
Partial pressure of X p/3 3/3 1 atm.

Q3.  A chemical reaction A⇌B is said to be at equilibrium when:
•  Complete conversion of A to B has taken place
•  Conversion of A to B is only 50% complete
•  Only 10% conversion of A to B has taken place
•  The rate of transformation of A and B is just equal to the rate of transformation of B to A in the system
Solution
d) A chemical equilibrium is the state when concentration of reactants and products do not change with time. It is attained when rate of forward reaction becomes equal to rate of backward reaction.

Q4. As the temperature increases, the pH of a KOH solution
•  Will decrease
•  Will increase
•  Remains constant
•  Depends upon the concentration of KOH solution
Solution
b)

Q5.Aqueous solution of sodium cyanide is
•  Acidic
•  Amphoteric
•  Basic
•  Neutral
Solution
c) Aqueous solution of NaCN is basic because it is a salt of strong base and weak acid

Q6.For the reaction, N2+3H2⇌2NH3 at 5000C, the value of Kp is 1.44 × 10-5.
What will be the value of Kp at low pressure where the gases are behaving almost ideally?
•  1.44 × 10-5
•  (0.082 × 773)2× 1.44 × 10-5
•  1.44 × 10-5×(0.082 × 500)2
•  1.44 × 10-5× (0.082 × 773)3
Solution
a) Kp is independent of pressure.

Q7.Which is not amphoteric?
•   HSO4-
•   HCO3-
•  H2PO4-
•  HCOO-
Solution
(d) HCOO- is base having conjugate acid HCOOH (a monobasic acid).

Q8.What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.1 M in CH3COOH? K_a for CH3COOH is 1.8×10-5.
•   3.5×10-4
•  1.1×10-5
•  1.8×10-5
•  9.0×10-6
Solution
d) pH=pKa+log⁡[Conjugate base]/[Acid] =5.045 ∴ [H+]=9.0×10-6.

Q9.The Ksp for Cr(OH)3 is 1.6 1030.The molar solubility of this compound in water is:
•  (1.6 1030)1/2
•   (1.6 1030)1/4
•  (1.6 1030⁄271/4
•  (1.6 1030)⁄27
Solution
c) Let molar solubility of Cr(OH)_]3=s mol L-1 Cr(OH)3 (s)⇌Cr^(3+) (aq)+3OH- (aq) s 3s Ksp=1.6×10-30=[Cr3+] [OH- ]3 =(s) (3s)3=27s4 ∴ s4=(1.6×10-30)/27

Q10. For the reaction, 2A(g)⇌3C(g)+D(s), the value of Kc will be equal to
•  Kp(RT)
•   Kp⁄RT
•  =Kp
•  None of these
Solution
b) 2A(g)⇌3C(g)+D(s) For this reaction, ∆ng=3-2=1 ∴ Kp=Kc(RT)1 or Kc=Kp/RT

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