MCQOPTIONS
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MCQOPTIONS
This section includes 34 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The pH of 10-3 mol dm-3 of an aqueous solution of H2SO4 is |
| A. | 3 |
| B. | 2.7 |
| C. | 2 |
| D. | 1.5 |
| Answer» C. 2 | |
| 2. |
Kc value has |
| A. | No units |
| B. | Units |
| C. | Both a & b |
| D. | None |
| Answer» D. None | |
| 3. |
If a buffer solution of higher pH than seven is to be made we use |
| A. | Strong acid and strong base |
| B. | Weak acid and strong base |
| C. | Weak acid and strong base |
| D. | Weak acid and its salt with strong base |
| Answer» E. | |
| 4. |
Sodium benzoate and benzoic acid are mixed in equimolar ration to form buffer if pKa is 2 what will be the pH? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | Any one |
| Answer» D. Any one | |
| 5. |
AgCl dissolved with conc (2 10-2) Ksp will be |
| A. | 3.6 x 10-6 |
| B. | 3.6 x 10-5 |
| C. | 7.2 x 10-6 |
| D. | 4 x 10-4 |
| Answer» E. | |
| 6. |
In which of the following equilibria will Kc and Kp have the same value? |
| A. | PCI5 = PCI3 + Cl2 |
| B. | N2 + 3H2 = 2NH |
| C. | 2CO + O2 = CO2 |
| D. | N2 + O2 = 2NO |
| Answer» E. | |
| 7. |
Conversion of reactant into product in unit time is called |
| A. | Rate of forward reaction |
| B. | Rate of backward reaction |
| C. | Rate constant |
| D. | Rate co-efficient |
| Answer» B. Rate of backward reaction | |
| 8. |
At start of reaction the concentration of reactants is |
| A. | High |
| B. | Low |
| C. | According to Kc |
| D. | Constant |
| Answer» B. Low | |
| 9. |
Unit of Kc is |
| A. | Moles2dm+6 |
| B. | Moles-2dm+6 |
| C. | Moles+2dm-6 |
| D. | Kc may or may not have units |
| Answer» E. | |
| 10. |
In case of gases Kc is replaced by |
| A. | Ka |
| B. | Kb |
| C. | Kp |
| D. | K |
| Answer» D. K | |
| 11. |
Rate expression for ammonia synthesis is |
| A. | Kc=x2/(a-x)(b-x) |
| B. | Kc=x2/v(a-x) |
| C. | Kc=4x2/(a-2x)2(b-x) |
| D. | Kc=4x2v2/(a-x)(b-3x)3 |
| Answer» E. | |
| 12. |
Catalyst used to speed up the reaction of ammonia synthesis is |
| A. | V2O5 |
| B. | V2O5 and Pt |
| C. | Fe |
| D. | Pieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2 |
| Answer» E. | |
| 13. |
When the value of Kc is very small then |
| A. | Reaction is at start |
| B. | Product conc. Is maximum |
| C. | Reactant conc. Is minimum |
| D. | Reaction is completed |
| Answer» C. Reactant conc. Is minimum | |
| 14. |
Temperature for preparation of SO3 is |
| A. | 400-500?C |
| B. | 400?C |
| C. | 600?C |
| D. | 200?C |
| Answer» B. 400?C | |
| 15. |
Negative log of mular concentration of H+ ions is called |
| A. | PH |
| B. | POH |
| C. | PKa |
| D. | PKw |
| Answer» B. POH | |
| 16. |
By the addition of base in waterpH will be |
| A. | More than 7 |
| B. | Less than 7 |
| C. | Equal to 7 |
| D. | No effect |
| Answer» B. Less than 7 | |
| 17. |
Idea of pH and pOH was put forward by |
| A. | Gibbs |
| B. | Einstein |
| C. | Sorenson |
| D. | Chadwick |
| Answer» D. Chadwick | |
| 18. |
Any substance which accepts H+ is base favours the concept |
| A. | Lowrys |
| B. | Lewis |
| C. | Arrhenius |
| D. | None of these |
| Answer» B. Lewis | |
| 19. |
Conjugated base of a weak acid is |
| A. | Weak |
| B. | Strong |
| C. | Moderately weak |
| D. | Unstable |
| Answer» C. Moderately weak | |
| 20. |
When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called |
| A. | Common ion effect |
| B. | Solubility product |
| C. | Dissociation constant |
| D. | Dissociation constant for an acid |
| Answer» C. Dissociation constant | |
| 21. |
Solution having the property of a very little change in pH on adding a small amount of strong acid or base is called |
| A. | Buffer solution |
| B. | Normal solution |
| C. | Standard solution |
| D. | Neutral solution |
| Answer» B. Normal solution | |
| 22. |
pH of an aqueous solution is 5.5. The hydroxyl ion conc. In the solution would be |
| A. | ?5.5 |
| B. | ?8.5 |
| C. | 10-8.5 |
| D. | 10 |
| Answer» D. 10 | |
| 23. |
For a reaction involving only gases at 25?C the equilibrium constant can be expressed in terms of molarity Ke or partial pressure Kp. Which is true about the numerical value of Kp? |
| A. | Kc is generally greaer than Kp |
| B. | Kc is generally less than Kp |
| C. | Kc is generally equal to Kp |
| D. | Kc is equal to Kp if the total moles of reactants and products are equal |
| Answer» E. | |
| 24. |
Which of following is not a base |
| A. | KOH |
| B. | NH3 |
| C. | PH3 |
| D. | BF3 |
| Answer» E. | |
| 25. |
Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution? |
| A. | 0.0002M HCI |
| B. | 0.2 mole of NaCI with 0.2 mole of HNO3 |
| C. | 0.4 mole of CH3COOH with 0.4 mole of NaOH |
| D. | 0.4 mole of NH3 with 0.2 mole of HCI |
| Answer» E. | |
| 26. |
Which one of the following aqueous solutions will be basic? |
| A. | NaCI |
| B. | Na2SO4 |
| C. | Na2CO3 |
| D. | FeCl3 |
| Answer» D. FeCl3 | |
| 27. |
The value of Kw in an acidic aquueous solution at 298 K is |
| A. | >10-14 |
| B. | <10-14 |
| C. | 101? |
| D. | 10-1? |
| Answer» E. | |
| 28. |
Reaction which proceeds in both directions is called |
| A. | Reversible |
| B. | Irreversible |
| C. | Spontaneous |
| D. | Non-spontaneous |
| Answer» B. Irreversible | |
| 29. |
Chemical equilibrium state is |
| A. | Dynamic state |
| B. | Static state |
| C. | Free state |
| D. | Unidirectional state |
| Answer» B. Static state | |
| 30. |
Addition of CH3COOH and CH3COONa gives in water |
| A. | Standard solution |
| B. | Buffer solution |
| C. | Acidic buffer solution |
| D. | Both b & c |
| Answer» E. | |
| 31. |
Which one of the following is a buffer solution? |
| A. | Brine |
| B. | Blood |
| C. | Glue |
| D. | Solution of CuSO4 |
| Answer» C. Glue | |
| 32. |
Solubility of any salt can be determined from |
| A. | Ka |
| B. | Kb |
| C. | Kc |
| D. | Ksp |
| Answer» E. | |
| 33. |
By decreasing the pressure the reaction will go to that direction where |
| A. | Volume is decreased |
| B. | Volume increased |
| C. | Heat absorbed |
| D. | No. of moles of specie decreased |
| Answer» C. Heat absorbed | |
| 34. |
Equilibrium state is achieved quickly by the addition of. |
| A. | Reactants |
| B. | Acid |
| C. | Base |
| D. | Catalyst |
| Answer» E. | |