10th class chemistry unit 1 MCQs
chapter 1 MCQs 10th Class Chemistry
Chemical Equilibrium:
1. In a chemical reaction, the substances which react together are called:
a. Equilibrium
b. Reactants
c. Numerator
d. Products
2. Plants use …….. for photosynthesis:
a. Nitrogen
b. Carbon dioxide
c. Sulphur
d. Oxygen
3. The color of iodine is:
a. Purple
b. Black
c. Green
d. Yellow
4. At equilibrium state, there are possibilities:
a. Four
b. Two
c. Five
d. Three
5. The color of HI is:
a. Red
b. Orange
c. Colourless
d. Purple
6. The substances which are formed during a chemical reaction are called:
a. Radicals
b. Products
c. Elements
d. Reactants
7. Reversible reaction is represented by:
a. ⇄
b. →
c. ⇌
d. ⇔
8. In the beginning, the rate of reverse reaction is:
a. Very fast
b. Less
c. Slow
d. Moderate
9. Molar concentration is represented by:
a. ( )
b. { }
c. [ ]
d. All
10. Guldberg and Waage put law of mass action in:
a. 1879
b. 1859
c. 1889
d. 1869
11. Who presented law of mass action?
a. Rutherford
b. Dalton
c. Moselay
d. Guldberg
12. The units for molar concentration are:
a. moldm3
b. mo-1dm-3
c. moldm-3
d. mol-1dm3
14. Kc is equal to:
a. Kf/kf
b. kf/kr
c. Kc/kc
d. kr/kf
15. The value of Kc in equilibrium state is:
a. Kr/Rr
b. Kr/Kf
c. Rf/Rr
d. Kf/Kr
16. For reaction 2A +B ⇄3C: equilibrium constant can be represented as:
a. [3c] / [2A][B]
b. [2A][B] / [3c]
c. [C]3 / [A]2[B]
d. [A]2[B] / [C]3
17. The equilibrium constant expression for equationH2(g)+I2(g)⇌2HI(g) is:
a. KC =[Hl]2 / [H2][l2]
b. KC =[Hl]2 / [H2][I2]
c. KC =[H]2[I]2 / [HI]2
d. KC =[H2][I2] / [HI]2
18. Which of the following equilibrium expression is correct for the following reaction? H2(g)+I2(g)⇌2HI(g)
a. KC =[HI]2 / [H2][I2]
b. KC =[H2][I2] / [2HI]
c. KC =[H]2[I]2 / [HI]2
d. KC = [2HI] / [H2][I2]
19. The value of Kc depends upon:
a. Temperature
b. Initial concentration
c. Both
d. None of the above
20. In a reaction, when the number of moles at both sides is equal then the unit of K will be:
a. moldm3
b. mol-2dm6
c. mol-2dm
d. No unit
21. In balanced equation N2(g)+3H2(g)⇌2NH3(g) the units of equilibrium constant are:
a. moldm-3
b. mol-2dm6
c. mol-1dm-3
d. None
22. The Kc units for the following reaction will be: H2(g)+I2(g)⇌2HI(g)
a. mol-1dm-3
b. moldm-3
c. moldm3
d. None
23. Reaction will be in equilibrium if:
a. QC = KC
b. QC > KC
c. QC = 0
d. QC < KC
24. The large value of Kc indicates that the reaction will be:
a. Proceed in the forward direction
b. In equilibrium
c. Proceed in the reverse direction
d. Completed
25. If QC < KC then reaction proceed:
a. Equilibrium
b. Forward direction
c. Reverse direction
d. In both directions
26. Reaction will proceed from left to right if:
a. QC < KC
b. QC = KC
c. QC = 0
d. QC > KC
27. If QC = KC then reaction will proceed:
a. In equilibrium state
b. Forward
c. Reverse
d. None of the above
28. In reaction N2O4 ⇄2NO2, the value of Kc will be:
a. 0.211
b. 0.213
c. 0.212
d. 0.214
29. In a reversible reaction if QC = KC then we can conclude that:
a. Equilibrium has been attained
b. Reaction is occurring in forward direction
c. Reaction is not at equilibrium
d. Reaction is occurring in reverse direction
30. For which reaction, k is rate constant?
a. Upward reaction
b. Forward reaction
c. Downward reaction
d. Reverse reaction
31. If QC > KC then reaction will be:
a. In the forward direction
b. Static equilibrium
c. In the reverse direction
d. Chemical equilibrium
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