MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is most unreactive? |
| A. | Mg |
| B. | \[M{{g}^{+}}\] |
| C. | \[M{{g}^{2+}}\] |
| D. | All above species are inert |
| Answer» D. All above species are inert | |
| 2. |
When electrons are added the resulting ion is called |
| A. | basic radical |
| B. | acidic radicals |
| C. | neutral radical |
| D. | None of these |
| Answer» C. neutral radical | |
| 3. |
Valency of an atom or radicals is |
| A. | ionisation energy |
| B. | electron affinity of atom |
| C. | its combining capacity |
| D. | size of atom |
| Answer» D. size of atom | |
| 4. |
The observation that does not indicate a chemical reaction is |
| A. | change of temperature |
| B. | change of colour |
| C. | evolution of a gas |
| D. | None of these |
| Answer» E. | |
| 5. |
Which of the following reaction is endothermic? |
| A. | \[C+{{O}_{2}}\to C{{O}_{2}}\] |
| B. | \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\] |
| C. | \[C{{H}_{4}}+2{{O}_{2}}\to C{{O}_{2}}+2{{H}_{2}}O\] |
| D. | \[CaO+{{H}_{2}}\to Ca{{(OH)}_{2}}\] |
| Answer» C. \[C{{H}_{4}}+2{{O}_{2}}\to C{{O}_{2}}+2{{H}_{2}}O\] | |
| 6. |
Slow eating away of iron articles in the presence of moist air is called |
| A. | galvanisation |
| B. | crystallization |
| C. | rusting |
| D. | neutralization |
| Answer» D. neutralization | |
| 7. |
The total number of atoms represented by the compound \[CuS{{O}_{4}}.\,5{{H}_{2}}O\]is |
| A. | 27 |
| B. | 21 |
| C. | 5 |
| D. | 8 |
| Answer» C. 5 | |
| 8. |
A molal solution is one that contains 1 mole of a solute in |
| A. | one litre of the solvent |
| B. | 1000 got the solvent |
| C. | one litre of the solution |
| D. | 22.4 litres of the solution |
| Answer» C. one litre of the solution | |
| 9. |
In the reaction : \[PbO+C\to Pb+CO\] |
| A. | PbO is oxidised |
| B. | PbO is oxidant |
| C. | C is reductant |
| D. | Both [b] and [c] |
| Answer» E. | |
| 10. |
Which of the following statements is true about chemical equation? |
| A. | Mass is conserved |
| B. | Atoms are conserved |
| C. | Mass as well as atoms are conserved |
| D. | Molecules are conserved |
| Answer» D. Molecules are conserved | |
| 11. |
The reactions in which two compounds exchange their radicals to form two new compounds are called |
| A. | displacement reaction |
| B. | decomposition reaction |
| C. | double displacement reaction |
| D. | isomerisation reaction |
| Answer» D. isomerisation reaction | |
| 12. |
\[CuO+{{H}_{2}}\to Cu+{{H}_{2}}O\]Above reaction is an example of |
| A. | Redox reaction |
| B. | synthesis reaction |
| C. | neutralisation reaction |
| D. | decomposition reaction |
| Answer» B. synthesis reaction | |
| 13. |
Which of the following involves combination of two elements? |
| A. | \[CaO+C{{O}_{2}}\to CaC{{O}_{3}}\] |
| B. | \[4Na+{{O}_{2}}\to 2N{{a}_{2}}O\] |
| C. | \[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\] |
| D. | \[N{{H}_{3}}+HCl\to N{{H}_{4}}Cl\] |
| Answer» C. \[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\] | |
| 14. |
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is formed. This is an example of |
| A. | combination reaction |
| B. | displacement reaction |
| C. | decomposition reaction |
| D. | double decomposition reaction |
| Answer» E. | |