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NEET Chemistry MCQ
Chemical And Ionic Equilibrium Mcq
Quiz 6
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Q.1
A 1M solution of glucose reaches dissociation equilibrium according to the equation given below:6HCHO ↔ C6H12O6What is the concentration of HCHO at equilibrium if equilibrium constant is 6×1022 ..[MP PMT 2000]
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a) 1.6×10-8M
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b)3.2×10-6M
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c)3.2×10-4M
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d)1.6×10-4M
Explanation
Concentration at equilibrium is HCHO=6x and C6H12O6=1-x From formula for constant Answer:(d)
Q.2
Kc for reactionN2(g) +O2(g) ↔ 2NO(g) at 300K is 4.0×10-Kp for above reaction will be (R=2 cal mol- K-1) ..[CBSE PMT 1994]
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b) 4 ×10-6
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a) 2.4 ×10-3
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c) 4 ×10-6(RT)2
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d) 16 × 10-12
Explanation
Δng=2-2=0∴ Kp=Kc Answer: (b)
Q.3
The reaction, SO2 + Cl2 → SO2Cl2 is exothermic and reversible. A mixture of SO2(g), Cl2(g) and SO2Cl2(l) is at equilibrium in a closed container. Now a certain quantity of extra SO2 is introduced into the container, the volume remaining the same. Which of the following is are true? [ ISM Dhanbad 1994]
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a)The pressure inside the container will not change
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b) The temperature will not change
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c)The temperature will increase
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d)The temperature will decrease
Explanation
On adding SO2, equilibrium shift forward. As it is exothermic reaction, temperature will increaseAnswer: (c)
Q.4
On the basis of Le Chatellier principle, predict which of the following conditions would be unfavorable for the formation of SO3? Given that 2SO2 + O2 ↔ 2SO3 ; ΔH=-42 kcal .. [ MP PET 1998]
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a) Low pressure
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b) High pressure
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c)high temperature
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d)high concentration of SO2
Explanation
reaction is exothermic thus increase in temperature is not favourableAnswer: (c)
Q.5
4 moles of A are mixed with 4 moles of B when 2 moles of C are formed at equilibrium according to the reactionA + B ↔ C + D The value of the equilibrium constant is ..[ CPMT 1992]
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a) 4
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b) 1
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c)1/2
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d)1/4
Explanation
At equilibrium concentration of A, B, C and D is 2 moles each thus equilibrium constant will be 1 Answer:(b)
Q.6
The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration. K is
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a) 0.5
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b) 1.5
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c) 2.5
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d) 2
Explanation
K=rate of forward/ rate of reverse Answer: (d)
Q.7
Consider the reaction PCl5(g) ↔ PCl3(g) + Cl2(g) in a closed container at equilibrium. At a fixed temperature what will be the effect of adding more PCl5 on the equilibrium concentration of Cl2(g)? [ BHU 1991]
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a)It decreases
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b) It increases
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c)It remains unaffected
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d)It can not be predicted without the value of Kp
Explanation
Answer: (b)
Q.8
Which of the following is not affected by pressure change? [ Pb CET 1999]
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a) 2NO2(g) ↔ N2O4(g)
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b) CO2(g) + H2O (l)↔ CO2 (solution)
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c)H2(g) + I2(g) ↔ 2HI(g)
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d)2O3(g) ↔ 3O2(g)
Explanation
In option 'c' number of moles of gases on reactant and product side is equal thus no change in pressureAnswer: (c)
Q.9
An equilibrium mixture for the reaction2H2S (g) ↔ 2H2(g) + S2(g) had one mole of hydrogen sulphide, 0.2 mole of H2 and 0.8 mole of S2 in a two litre vessel. the value of K in mole/litre is [ IIT 1991]
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a) 0.005
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b) 0.016
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c)0.08
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d)0.160
Explanation
Concentration of hydrogen sulphide=0.5, concentration of H2 is 0.1 and concentration of S2 is 0.4USe formula for equilibrium constant Answer:(b)
Q.10
In the reaction PCl5(g) ↔ PCl3 + Cl2(g) the equilibrium concentration of PCl5 and PCl3 are 0.4 and 0.2 mole/litre respectively. If the value of K is 0.5, what is the concentration of Cl2 mole/litre [ EAMCET 2003]
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a) 2.0
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b) 1.5
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c) 1.0
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d) 0.5
Explanation
For formula Answer: (c)
Q.11
The KSP of Ag2CrOAgCl, AgBr and AgI are respectively 1.1×10-12, 1.8×10-10, 5.0 ×10-13, 8.3×10-17 Which of the following salts will precipitate last if AgNO3solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4? [ AIPMT 2013]
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a) AgI
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b) AgCl
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c) AgBr
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d) Ag2CrO4
Explanation
Ag2CrO4 ⇒ 2Ag+ + CrO42- Solubility product KSP = (2S)2 ×S = 4s3 KSP = (1.1 × 10-12) (given) AgCl ⇒ Ag+ + Cl- KSP = s × s ( KSP = 1.8 × 10-10) s = √KSP = 1.34×10-5 AgBr ⇒ Ag+ Br- KSP = s × s ( KSP = 5 × 10-13) s = √KSP = 0.71×10-6 AgI ⇒ Ag+ + I- KSP = s × s ( KSP = 8.3 × 10-17) s = √KSP = 0.9×10-8 ∵ Solubility of Ag2CrO4 is highest So, it will precipitate last Answer: (d)
0 h : 0 m : 1 s
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