11th class (Fsc) chemistry Unit 8 MCQs
Chapter 8 MCQs 11th Class Chemistry
Chemical Equilibrium:
1. Molar concentration is called:
a. Mass
b. Active mass
c. Weight
d. None of these
2. The law of mas action was given by:
a. Van’t Hoff
b. Guldberg and waage
c. Berthelot
d. Einstein
3. Law of mass action was derived by Guldbreg and wage in:
a. 1846
b. 1909
c. 1846
d. 1906
4. …… was derived by C.M Guldberg and P. Waage in 1864:
a. Distribution law
b. Law of conservation of mass
c. Law of conservation of energy
d. Law of mass action
5. In which of the following reaction, Kc, Kp will be equal
a. 2SO2+O2 ↔2SO3
b. PC𝓁5 ↔PC𝓁3+C𝓁2
c. N2+O2 ↔2NO
d. N2+2H2 ↔NH3
6. Equilibrium constant for gaseous equilibrium is represented by:
a. Ks
b. Ka
c. Kp
d. Kc
7. For which system does the equilibrium Kc has units of (Conc.)-1?
a. 2NO2 ↔ N2O4
b. N2+2H2 ↔2NH3
c. 2HF+ ↔ H2+F2
d. H2+I2 ↔ 2HI
8. The units of Kc for reaction N2+O2 ↔ 2NO will be:
a. Moles-2 /dm+6
b. Moles/dm3
c. No unit
d. Moles-1/dm3
9. The relationship between Kp and Kc is given by:
a. Kp = Kc (RT)△n
b. Kc = Kp (P)△n
c. Kp = Kc (RT)−△n
d. Kc = K p (P/N)△n
10. When Kc value is small, the equilibrium position is:
a. Remains unchanged
b. Toward left
c. None of these
d. Toward right
11. When Kc value of a reaction is very small, the equilibrium position lies to:
a. May left or right
b. Left
c. Cannot predicted
d. Right
12. A large value of Kc means that equilibrium:
a. Both are present in same amount
b. Less reactants and more product
c. Both are present in appreciable amount
d. More recatants and less product
13. The concentration of reactants and products at equilibrium are:
a. Minimum
b. Equal
c. Constant
d. Maximum
14. The aqueous solution of BiCl3 is cloudy. Cloudiness of BiCl3 solution cab be cleared by:
a. Addiction of HCL
b. Addiction of Cl2
c. Addiction ofBiCl3 & H2O
d. Addicition of H2O
15. which one affect the value of Kc?
a. Pressure
b. Concentration
c. Catalyst
d. Temperature
16. In Haber process, for formation of NH3 the pressure used is:
a. 600 atm
b. 100 atm
c. 1000 atm
d. 200-300 atm
17. which statement about the following equilibrium is correct:
a. Adding V2 O5 catalyst increase the yield of SO2
b. The value of Kp falls with rise in temperature
c. The of Kp is equal to Kc
d. The value of Kp falls with in creasing pressure
18. Catalyst used in preparation of NH3 from N2 and H2 is:
a. Pt
b. Fe
c. V2O5
d. Ni
19. The optimum temperature for the synthesis NH3 by Gaber’s processis:
a. 400oC
b. 200oC
c. 500oC
d. 300oC
20. The unit of Kc for the reaction of ammonia synthesis are:
a. Moles-2 dm3
b. Moles-2 dm4
c. Moles-2 dm2
d. Moles-2 dm6
21. Catalyst used in prepration of SO3 gas from SO2 is:
a. V2O5
b. AI2O3
c. SiO2
d. CaO
22. The value of Kw at 25oC is:
a. 1 x 10-14
b. 0.011 x 10-14
c. 3 x 10-14
d. 0.30 x 10-14
23. pH of rain water is:
a. 6.2
b. 5.0
c. 7.0
d. 6.0
24. In case when [OH–] > [H+] the solution is:
a. Basic
b. Acidic
c. Neutral
d. None of these
25. The ionic product of water will increase if:
a. Temperature is increased
b. H+ ion are added
c. OH– ions are added
d. H+ and OH– ions are added in equal amount