MCQOPTIONS
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MCQOPTIONS
This section includes 255 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Sulphate ion can be written symbolically as |
| A. | SO₄2- |
| B. | SO₃2- |
| C. | SO₄2- |
| D. | S2- |
| Answer» E. | |
| 2. |
The number of positive ions balances the number of negative charges so as to neutralize the compound and give the charge |
| A. | one |
| B. | unit |
| C. | zero |
| D. | negative |
| Answer» D. negative | |
| 3. |
Formula of tetra chloromethane is |
| A. | CCl₄ |
| B. | CH₄Cl₄ |
| C. | C(HCl)4 |
| D. | C4. HCl₄ |
| Answer» B. CH₄Cl₄ | |
| 4. |
Chemical formula of Ammonium Sulfate is |
| A. | NH₃SO₄ |
| B. | NH₄(HSO₄)₂ |
| C. | (NH₄)₂SO₄ |
| D. | (NH₂)₄SO₄ |
| Answer» D. (NH₂)₄SO₄ | |
| 5. |
The name given to ions containing oxygen (O₂) are usually called |
| A. | oxalates |
| B. | oxides |
| C. | ates |
| D. | oxy |
| Answer» D. oxy | |
| 6. |
In most of the organic compounds, the group found is |
| A. | benzene ring |
| B. | aldehydes |
| C. | ketone |
| D. | carboxylic |
| Answer» B. aldehydes | |
| 7. |
In order to form Copper(II) Hydroxide, number of Hydroxyl ions to gain stability with one Copper ion will be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 8. |
Formula Ca(OH)₂ is of |
| A. | Calcium Hydrogen per oxide |
| B. | calcium hydroxy acids |
| C. | calcium hydro peroxide |
| D. | calcium hydroxide |
| Answer» E. | |
| 9. |
A salt(s) and H₂(g) is produced if reactants are |
| A. | an acid and oxide |
| B. | an acid and a metal |
| C. | an acid and base |
| D. | an acid and a sodium hydrogen carbonate |
| Answer» C. an acid and base | |
| 10. |
In KHCO₃, element with highest atomic mass is |
| A. | Oxygen |
| B. | Hydrogen |
| C. | Potassium |
| D. | Carbon |
| Answer» D. Carbon | |
| 11. |
While writing ionic equations, |
| A. | ions actively involved in chemical change are written down |
| B. | spectator ions may be omitted |
| C. | only spectator ions are written down |
| D. | both a and b |
| Answer» E. | |
| 12. |
Valency of Sulphide is |
| A. | +1 |
| B. | +2 |
| C. | -1 |
| D. | -2 |
| Answer» E. | |
| 13. |
Percentage of an element can be calculated through |
| A. | relative atomic mass of the element in the formula/relative molecular mass of the element |
| B. | relative atomic mass of the element in the formula/relative molecular mass of the compound |
| C. | structural formula |
| D. | both a and b |
| Answer» E. | |
| 14. |
To balance Cu + H₂SO₄ → CuSO₄ + H₂O + SO₂; number of H₂SO₄ molecules will be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 15. |
To determine the mass of product one must use the |
| A. | mass of reactants |
| B. | molar mass of reactants |
| C. | the balanced equation |
| D. | all of above |
| Answer» E. | |
| 16. |
Decolourization of bromine water will occur, on mixing it with |
| A. | ethene |
| B. | benzene |
| C. | propene |
| D. | butene |
| Answer» B. benzene | |
| 17. |
Al+3 indicates that |
| A. | it needs -3 valency to become stable |
| B. | it has high positive charge |
| C. | Aluminum is found in Group-II |
| D. | both a and b |
| Answer» E. | |
| 18. |
The formula of hydrogen carbonate is |
| A. | HCO₃⁻ |
| B. | H⁻₃CO |
| C. | HC⁻₃O |
| D. | HCO₃ |
| Answer» B. H⁻₃CO | |
| 19. |
In Calcium Chloride, percentage composition of Calcium is |
| A. | 0.4621 |
| B. | 0.3722 |
| C. | 0.4621 |
| D. | 0.36112 |
| Answer» E. | |
| 20. |
The ions which are composed of more than one type of atom are called |
| A. | ionic compounds |
| B. | covalent compounds |
| C. | compound ions |
| D. | ionic ions |
| Answer» D. ionic ions | |
| 21. |
Combining Copper(I) (Cu+) with Oxygen (O₂) results in |
| A. | CuO |
| B. | Cu₂O |
| C. | CuO₂ |
| D. | Cu(OH)₂ |
| Answer» C. CuO₂ | |
| 22. |
The reaction in which monomers containing carbon-to-carbon double bond react together to form a long chain of polymers is called |
| A. | addition polymerization |
| B. | substitution polymerization |
| C. | condensation polymerization |
| D. | none of above |
| Answer» B. substitution polymerization | |
| 23. |
Sodium Carbonate Na₂CO₃ indicates that for each Carbonate ion (CO₃-2), number of Sodium ions (Na+) are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 24. |
In Na₂CO₃.10H₂O, after water, highest percentage composition is of |
| A. | sodium |
| B. | oxygen |
| C. | carbon |
| D. | hydrogen |
| Answer» C. carbon | |
| 25. |
2 methyl-2 propan-2-ol is an example of |
| A. | primary alcohol |
| B. | secondary alcohol |
| C. | tertiary alcohol |
| D. | quaternary alcohol |
| Answer» D. quaternary alcohol | |
| 26. |
CH₃OH is called |
| A. | methane |
| B. | alcohol |
| C. | methanol |
| D. | methyl |
| Answer» D. methyl | |
| 27. |
Plumbum is Latin name of |
| A. | Potassium |
| B. | Lead |
| C. | Copper |
| D. | Valium |
| Answer» C. Copper | |
| 28. |
Valency of all of these ions is +1, except |
| A. | Ag |
| B. | Cu |
| C. | NH₄ |
| D. | Fe |
| Answer» E. | |
| 29. |
The main important source of hydrocarbons is |
| A. | petrol |
| B. | crude oil |
| C. | copper |
| D. | petroleum |
| Answer» C. copper | |
| 30. |
An ionic equation chemical reaction, |
| A. | symbolically represents all ions in the solution |
| B. | the states of reactants and products are mentioned as transcripts |
| C. | aqueous elements are shown as the ions it produces in solution |
| D. | all of these |
| Answer» D. all of these | |
| 31. |
Amino acid monomers contain chain with peptide linkage realizing a water molecule happens in |
| A. | addition polymerization |
| B. | substitution polymerization |
| C. | condensation polymerization |
| D. | none of above |
| Answer» D. none of above | |
| 32. |
The element which is never found completely pure in nature is |
| A. | iron |
| B. | copper |
| C. | mercury |
| D. | hydrogen |
| Answer» B. copper | |
| 33. |
Formula of potassium sulphate is |
| A. | KSO₃ |
| B. | KSO₄ |
| C. | KHSO₃ |
| D. | K₂SO₄ |
| Answer» E. | |
| 34. |
Chemical formula of rouge pigment is |
| A. | Fe₂O₃ |
| B. | Fe₃O₄ |
| C. | FeSO₄ |
| D. | FeNO₃ |
| Answer» B. Fe₃O₄ | |
| 35. |
The stoichiometry of the equation is defined as the mole ratio of |
| A. | reactants only |
| B. | products only |
| C. | catalyst |
| D. | reactants and products |
| Answer» E. | |
| 36. |
Compounds are not formed by elements |
| A. | which are non-metals |
| B. | which are metals |
| C. | which have zero valency |
| D. | which have radicals |
| Answer» D. which have radicals | |
| 37. |
Valency of Ferrum can be |
| A. | 2 or 4 |
| B. | 4 or 6 |
| C. | 3 or 5 |
| D. | 2 or 3 |
| Answer» E. | |
| 38. |
In case of organic compound's empirical formula, it should be |
| A. | impure |
| B. | pure |
| C. | alkaline |
| D. | base |
| Answer» C. alkaline | |
| 39. |
In Sulfuric Acid (H₂SO₄), chemical composition of Hydrogen (H) is |
| A. | 0.224 |
| B. | 0.0204 |
| C. | 0.0224 |
| D. | 0.244 |
| Answer» C. 0.0224 | |
| 40. |
Consider reactants: HNO₃ and BaSO₃ |
| A. | reaction takes place in aquatic state |
| B. | the reaction results in Barium nitrate |
| C. | reaction results in barium nitrite |
| D. | the reaction may not occur at all |
| Answer» E. | |
| 41. |
Valency of iron (Fe) is |
| A. | Fe+2 |
| B. | Fe+3 |
| C. | Fe+5 |
| D. | both a and b |
| Answer» E. | |
| 42. |
When Sodium Hydroxide (NaOH) reacts with Copper Sulfate (CuSO₄), spectator ions will be |
| A. | sodium and copper |
| B. | Copper and hydroxide |
| C. | sodium and sulfate |
| D. | sulfate and hydroxide |
| Answer» D. sulfate and hydroxide | |
| 43. |
Six carbon atoms bonded together in a particular way making hexagon reflects a |
| A. | benzene ring |
| B. | aldehydes |
| C. | ketone |
| D. | carboxylic |
| Answer» B. aldehydes | |
| 44. |
The simplest whole-number ratio which is representing 1 molecule is called |
| A. | molecular formula |
| B. | empirical formula |
| C. | structural formula |
| D. | model |
| Answer» C. structural formula | |
| 45. |
The simplest arenes is |
| A. | benzene |
| B. | phenol |
| C. | aminarenes |
| D. | alkenes |
| Answer» B. phenol | |
| 46. |
Formula of Sodium Hydroxide is |
| A. | NaHO |
| B. | NaOH₂ |
| C. | NaOH |
| D. | Na₂OH |
| Answer» D. Na₂OH | |
| 47. |
The percentage by mass of any element is calculated with the help of |
| A. | formula of compound only |
| B. | relative atomic masses only |
| C. | nucleon number |
| D. | formula of compound and relative atomic masses |
| Answer» E. | |
| 48. |
Formula of Calcium Nitride (Ca₃N₂) is |
| A. | Ca₃N₅ |
| B. | Ca₃NO₂ |
| C. | Ca₃N₂ |
| D. | Ca₂N₅ |
| Answer» D. Ca₂N₅ | |
| 49. |
Hydrocarbons contain |
| A. | carbon only |
| B. | hydrogen only |
| C. | oxygen |
| D. | carbon and hydrogen |
| Answer» E. | |
| 50. |
The maximum number of hydrogen atoms are present in molecules of alkanes hence they are |
| A. | saturated hydrocarbons |
| B. | unsaturated hydrocarbons |
| C. | super saturated hydrocarbons |
| D. | super unsaturated hydrocarbon |
| Answer» B. unsaturated hydrocarbons | |