MCQOPTIONS
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MCQOPTIONS
This section includes 265 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Catalytic converters can not help in any way to reduce |
| A. | carbon monoxide |
| B. | nitrogen oxides |
| C. | carbon dioxide |
| D. | unburnt hydrocarbons |
| Answer» D. unburnt hydrocarbons | |
| 2. |
In an unsaturated solution, the concentration of each ion of sparingly soluble salt at 298k, tells us the |
| A. | solubility product |
| B. | solubility reactant |
| C. | dynamic equilibrium |
| D. | solubility equilibrium |
| Answer» B. solubility reactant | |
| 3. |
Uneven breaking of bond is |
| A. | homolytic fission |
| B. | heterolytic fission |
| C. | binary fission |
| D. | multiple fission |
| Answer» C. binary fission | |
| 4. |
Reactions which take place on 10⁻¹⁴ to 10⁻¹⁵ seconds are termed as |
| A. | Nano chemistry |
| B. | Femtochemistry |
| C. | Microchemistry |
| D. | Biochemistry |
| Answer» C. Microchemistry | |
| 5. |
The rate of a chemical reaction is increased by a substance called |
| A. | reactant |
| B. | catalyst |
| C. | sludge |
| D. | product |
| Answer» C. sludge | |
| 6. |
The study of the rate of chemical reactions is called |
| A. | reaction rate |
| B. | reaction kinetics |
| C. | reaction speed |
| D. | reaction power |
| Answer» C. reaction speed | |
| 7. |
Consider the reaction: Na(s) + O₂(g) → Na₂O(s). Moles of sodium needed to balance the equation would be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 8. |
It becomes easier to lose electrons as we move |
| A. | up the Group-II |
| B. | down the Group-II |
| C. | across the period 2 (left to right ) |
| D. | across the period 2 (right to left ) |
| Answer» C. across the period 2 (left to right ) | |
| 9. |
Stopped flow spectrophotometry is use to monitor course of |
| A. | fast reactions |
| B. | slow reactions |
| C. | equilibrium reactions |
| D. | reversible reactions |
| Answer» B. slow reactions | |
| 10. |
The formation of radicals which attack reactants molecules generates more free radicals. This step is a |
| A. | initiation step |
| B. | propagation step |
| C. | termination step |
| D. | elimination step |
| Answer» C. termination step | |
| 11. |
The rate of reaction in cm³ of gas per second can be calculated by measuring |
| A. | volume of gas |
| B. | pressure |
| C. | density |
| D. | moles of gas |
| Answer» B. pressure | |
| 12. |
Catalytic converters used in cars used to |
| A. | oxidize carbon monoxide |
| B. | reduce nitrogen oxides |
| C. | oxidize unburnt hydrocarbons |
| D. | all of above |
| Answer» E. | |
| 13. |
If particles have enough energy to react and change themselves into product particles, it makes possible |
| A. | effective collision only |
| B. | successful collision only |
| C. | unsuccessful collision |
| D. | effective and successful collision |
| Answer» E. | |
| 14. |
Consider the reaction: Na(s) + O₂(g) → Na₂O. Moles of oxygen needed to balance the equation are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 15. |
Salting is the last stage in the manufacturing of |
| A. | plastic |
| B. | soap |
| C. | detergent |
| D. | cements |
| Answer» C. detergent | |
| 16. |
The change in enthalpy when 1 mol of the compound is formed under standard conditions is called |
| A. | reaction |
| B. | formation |
| C. | combustion |
| D. | neutralization |
| Answer» C. combustion | |
| 17. |
Reversible reactions are those which products react together to give original |
| A. | reactants |
| B. | products |
| C. | enzymes |
| D. | catalyst |
| Answer» B. products | |
| 18. |
Carbon monoxide is a gas which is |
| A. | colorless |
| B. | odorless |
| C. | tasteless |
| D. | all of above |
| Answer» E. | |
| 19. |
The Group-II metals form |
| A. | Ionic bonds |
| B. | Covalent bonds |
| C. | Metallic bonds |
| D. | Diatic bonds |
| Answer» B. Covalent bonds | |
| 20. |
The mixture of hexane and water is |
| A. | unreactive only |
| B. | immiscible only |
| C. | miscible |
| D. | unreactive and immiscible |
| Answer» E. | |
| 21. |
Hydrogen chloride (HCl(g)) or hydrochloric acid (HCl(aq)) is an example of |
| A. | Ionic bond |
| B. | Covalent bond |
| C. | Metallic bond |
| D. | Co-ordinate bond |
| Answer» C. Metallic bond | |
| 22. |
Collision theory states that particles must collide with each other in the correct orientation and sufficient energy to |
| A. | attract |
| B. | repel |
| C. | react |
| D. | respond |
| Answer» D. respond | |
| 23. |
Number of grams of compound needed to saturate 100g of water is defined for |
| A. | solubility |
| B. | volatility |
| C. | polarity |
| D. | none of above |
| Answer» B. volatility | |
| 24. |
Changes in electrical conductivity during reactions is due to |
| A. | ions production only |
| B. | free electrons only |
| C. | free protons |
| D. | ions productions and free electrons |
| Answer» E. | |
| 25. |
Consider the reaction: P(s) + O₂(g) → P₄O₁₀(s). Moles of O₂(g) needed to balance the equation will be |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» D. 7 | |
| 26. |
Halide ions' ability to act as a reducing agent increases |
| A. | down the group |
| B. | across the period (left to right) |
| C. | across the period (right to left) |
| D. | up the group |
| Answer» B. across the period (left to right) | |
| 27. |
The situation in which ions and molecules are constantly reacting is called |
| A. | dynamic equilibrium |
| B. | constant equilibrium |
| C. | reversible |
| D. | irreversible |
| Answer» B. constant equilibrium | |
| 28. |
The solubility product is only applicable to |
| A. | soluble salts |
| B. | insoluble salts |
| C. | sparingly soluble salts |
| D. | sparingly insoluble salts |
| Answer» D. sparingly insoluble salts | |
| 29. |
When an undissolved ionic compound comes in contact with a saturated solution, there is an establishment of |
| A. | stability |
| B. | constancy |
| C. | equilibrium |
| D. | anion |
| Answer» D. anion | |
| 30. |
The system of reaction in which no reactant leaves the reaction mixture is termed as |
| A. | open system |
| B. | closed system |
| C. | semi-open system |
| D. | partially closed system |
| Answer» C. semi-open system | |
| 31. |
The water passing through rocks of calcium carbonate (CaCO₃) produces |
| A. | stalactites |
| B. | stalagmites |
| C. | salts |
| D. | Carbon dioxide (CO₂) |
| Answer» D. Carbon dioxide (CO₂) | |
| 32. |
Consider the equation: Mg(s) + H₂O(l) → Mg(OH)₂(aq) + H₂(g). Moles of Mg(s) required to balance the equation will be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 33. |
According to Le Chatellier's principle, the energy of surroundings can be increased by increasing |
| A. | volume |
| B. | density |
| C. | pressure |
| D. | temperature |
| Answer» E. | |
| 34. |
Eo is spoken as |
| A. | E standard |
| B. | standard potential |
| C. | E potential |
| D. | Equilibrium constant |
| Answer» B. standard potential | |
| 35. |
The solubility of ionic compound which contain common ion is les than its solubility in |
| A. | acid |
| B. | water |
| C. | base |
| D. | alkalis |
| Answer» C. base | |
| 36. |
Methyl group which is one electron short results in formation of positively charged ion called as |
| A. | nucleophile |
| B. | electrophile |
| C. | carbocation |
| D. | anion |
| Answer» D. anion | |
| 37. |
Upon dissolving Ca(OH)₂ in water, the solution becomes |
| A. | acidic |
| B. | alkaline |
| C. | catalyst |
| D. | neutral |
| Answer» C. catalyst | |
| 38. |
On increasing concentration of one or more reactants, more products will be generated until |
| A. | equilibrium |
| B. | closed system |
| C. | open system |
| D. | none of above |
| Answer» B. closed system | |
| 39. |
In nature, Magnesium Oxide (MgO) is |
| A. | acidic |
| B. | alkaline |
| C. | catalyst |
| D. | neutral |
| Answer» C. catalyst | |
| 40. |
The simple relationship between equilibrium concentrations of reactants and products with stoichiometry is called as |
| A. | equilibrium expression |
| B. | equilibrium relation |
| C. | dynamic equilibrium |
| D. | equilibrium constant |
| Answer» B. equilibrium relation | |
| 41. |
The effect of concentration of reagent on the rate of reaction determines |
| A. | order of reaction |
| B. | concentration of products |
| C. | concentration of reactants |
| D. | energy of activation |
| Answer» B. concentration of products | |
| 42. |
An aqueous solution of silver nitrate in excess ammonia called |
| A. | ammonical silver nitrate solution only |
| B. | Tollen's reagent only |
| C. | Fehling's solution |
| D. | ammonical silver nitrate solution and Tollen's reagent |
| Answer» E. | |
| 43. |
Presence of carbonyl group (C=O) will reflect the precipitate of color |
| A. | red |
| B. | orange |
| C. | brown |
| D. | white |
| Answer» C. brown | |
| 44. |
Position of equilibrium reaction is influenced by changes in |
| A. | concentration |
| B. | pressure |
| C. | temperature |
| D. | all of above |
| Answer» E. | |
| 45. |
If ketones are not oxidized, then upon heating Fehling's solution remains |
| A. | unchanged only |
| B. | blue only |
| C. | white |
| D. | unchanged and blue |
| Answer» E. | |
| 46. |
An acceptor of pair of the electron is termed as |
| A. | nucleophile |
| B. | electrophile |
| C. | carbocation |
| D. | anion |
| Answer» C. carbocation | |
| 47. |
The more negative electrons (e⁻) are attracted by more |
| A. | positive pole |
| B. | cathode |
| C. | negative pole |
| D. | anode |
| Answer» B. cathode | |
| 48. |
Fluorine (Fl₂) can be stored in containers of |
| A. | Al/Co alloy |
| B. | Co/Ni alloy |
| C. | Cu/Si alloy |
| D. | Cu/Ni alloy |
| Answer» E. | |
| 49. |
A toxic gas which binds with human hemoglobin and inhibit oxygen binding to blood is |
| A. | oxygen |
| B. | carbon dioxide |
| C. | carbon monoxide |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 50. |
Solution which contain copper(II) ions (Cu⁺²) is |
| A. | alkaline only |
| B. | Fehling's solution only |
| C. | acidic solution |
| D. | alkaline and Fehling's solution |
| Answer» E. | |