MCQOPTIONS
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MCQOPTIONS
This section includes 21 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 gives propyne on hydrolysis [AIIMS 2005] |
| A. | \[A{{l}_{4}}{{C}_{3}}\] |
| B. | \[M{{g}_{2}}{{C}_{3}}\] |
| C. | \[{{B}_{4}}C\] |
| D. | \[L{{a}_{4}}{{C}_{3}}\] |
| Answer» C. \[{{B}_{4}}C\] | |
| 2. |
Litharge is chemically [DPMT 1984; JIPMER 2001] |
| A. | \[PbO\] |
| B. | \[Pb{{O}_{2}}\] |
| C. | \[P{{b}_{3}}{{O}_{4}}\] |
| D. | \[Pb{{(C{{H}_{3}}COO)}_{2}}\] |
| Answer» B. \[Pb{{O}_{2}}\] | |
| 3. |
Percentage of lead in lead pencil is [CBSE PMT 1999] |
| A. | Zero |
| B. | 20 |
| C. | 80 |
| D. | 70 |
| Answer» B. 20 | |
| 4. |
Lead pipes are not suitable for drinking water because [JIPMER 2000] |
| A. | A layer of lead dioxide is deposited over pipes |
| B. | Lead reacts with air to form litharge |
| C. | Lead reacts with water containing air to form \[Pb{{(OH)}_{2}}\] |
| D. | Lead forms basic lead carbonate |
| Answer» D. Lead forms basic lead carbonate | |
| 5. |
When tin is treated with concentrated nitric acid [DCE 2004] |
| A. | It is converted into stannous nitrate |
| B. | It is converted into stannic nitrate |
| C. | It is converted into metastannic acid |
| D. | It becomes passive |
| Answer» D. It becomes passive | |
| 6. |
Which one of the following statements about the zeolites is false [CBSE PMT 2004] |
| A. | Zeolites are aluminosilicates having three dimensional network |
| B. | Some of the \[SiO_{4}^{-4}\]units are replaced by \[AlO_{4}^{-5}\] and \[AlO_{6}^{9-}\] ions in zeolites |
| C. | They are used as cation exchangers |
| D. | They have open structure which enables them to take up small molecules |
| Answer» C. They are used as cation exchangers | |
| 7. |
\[{{H}_{2}}{{O}_{2}}\] on reaction with PbS gives [RPET 2003] |
| A. | \[PbO\] |
| B. | \[PbS{{O}_{4}}\] |
| C. | \[Pb{{O}_{2}}\] |
| D. | \[PbHS{{O}_{4}}\] |
| Answer» C. \[Pb{{O}_{2}}\] | |
| 8. |
The compoundwhich does not possess a peroxide linkage is [JIPMER 1999] |
| A. | \[N{{a}_{2}}{{O}_{2}}\] |
| B. | \[Cr{{O}_{5}}\] |
| C. | \[{{H}_{2}}S{{O}_{5}}\] |
| D. | \[Pb{{O}_{2}}\] |
| Answer» E. | |
| 9. |
Sodium oxalate on heating with conc. \[{{H}_{2}}S{{O}_{4}}\] gives [Roorkee 2000] |
| A. | CO only |
| B. | \[C{{O}_{2}}\] only |
| C. | \[CO\] and \[C{{O}_{2}}\] |
| D. | \[S{{O}_{2}}\] and \[S{{O}_{3}}\] |
| Answer» D. \[S{{O}_{2}}\] and \[S{{O}_{3}}\] | |
| 10. |
Which of the following is insoluble in water [MP PET 2002] |
| A. | \[N{{a}_{2}}C{{O}_{3}}\] |
| B. | \[CaC{{O}_{3}}\] |
| C. | \[ZnC{{O}_{3}}\] |
| D. | \[A{{l}_{2}}{{(C{{O}_{3}})}_{3}}\] |
| Answer» E. | |
| 11. |
Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which is the best absorbing material for the carbon dioxide[Pb. PMT 2001] |
| A. | Heated copper oxide |
| B. | Cold, solid calcium chloride |
| C. | Cold, solid calcium hydroxide |
| D. | Heated charcoal |
| Answer» D. Heated charcoal | |
| 12. |
The structure of diborane \[({{B}_{2}}{{H}_{6}})\] contains [AIEEE 2005] |
| A. | Four 2c-2e bonds and two 3c-2e bonds |
| B. | Two 2c-2e bonds and four 3c-2e bonds |
| C. | Two 2c-2e bonds and two 3c-3e bonds |
| D. | Four 2c-2e bonds and four 3c-2e bonds |
| Answer» B. Two 2c-2e bonds and four 3c-2e bonds | |
| 13. |
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out in the presence of [IIT-JEE (Screening) 2000] |
| A. | \[NaCl\] |
| B. | Fluorite |
| C. | Cryolite which forms a melt with lower melting temperature |
| D. | Cryolite which forms a melt with higher melting temperature |
| Answer» D. Cryolite which forms a melt with higher melting temperature | |
| 14. |
In the commercial electrochemical process for aluminium extraction, the electrolyte used is [IIT-JEE 1999] |
| A. | \[Al{{(OH)}_{3}}\] in \[NaOH\] solution |
| B. | An aqueous solution of \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] |
| C. | A molten mixture of \[A{{l}_{2}}{{O}_{3}}\] and \[N{{a}_{3}}Al{{F}_{6}}\] |
| D. | A molten mixture of \[AlO(OH)\] and \[Al{{(OH)}_{3}}\] |
| Answer» D. A molten mixture of \[AlO(OH)\] and \[Al{{(OH)}_{3}}\] | |
| 15. |
In the electrolytic extraction of aluminium, cryolite is used [NCERT 1981; CPMT 1989; RPMT 2000; MP PMT 2000, 02] |
| A. | To obtain more aluminium |
| B. | To decrease temperature to dissolve bauxite |
| C. | To protect the anode |
| D. | As reducing agent |
| Answer» C. To protect the anode | |
| 16. |
The most acidic of the following compounds is [Bihar CEE 1995] |
| A. | \[{{P}_{2}}{{O}_{3}}\] |
| B. | \[S{{b}_{2}}{{O}_{3}}\] |
| C. | \[{{B}_{2}}{{O}_{3}}\] |
| D. | \[A{{s}_{2}}{{O}_{3}}\] |
| Answer» D. \[A{{s}_{2}}{{O}_{3}}\] | |
| 17. |
Aluminium oxide is not reduced by chemical reactions since [KCET 2002] |
| A. | Aluminium oxide is reactive |
| B. | Reducing agents contaminate |
| C. | Aluminium oxide is highly stable |
| D. | The process pollutes the environment |
| Answer» D. The process pollutes the environment | |
| 18. |
Common alumis [DPMT 1982; CPMT 1978; AMU 1982, 83] |
| A. | \[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] |
| B. | \[{{K}_{2}}S{{O}_{4}}.C{{r}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] |
| C. | \[{{K}_{2}}S{{O}_{4}}.F{{e}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] |
| D. | \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.FeS{{O}_{4}}.6{{H}_{2}}O\] |
| Answer» B. \[{{K}_{2}}S{{O}_{4}}.C{{r}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] | |
| 19. |
Aluminium is a self-preserving metal, because |
| A. | It is not tarnished by air |
| B. | A thin film of basic carbonate on its surface |
| C. | A non-porous layer of oxide is formed on its surface |
| D. | It is not affected by salt water |
| Answer» D. It is not affected by salt water | |
| 20. |
Hydrogen gas will not reduce [IIT 1984] |
| A. | Heated cupric oxide |
| B. | Heated ferric oxide |
| C. | Heated stannic oxide |
| D. | Heated aluminium oxide |
| Answer» E. | |
| 21. |
In diborane, the two \[H-B-H\] angles are nearly [AIIMS 2005] |
| A. | \[60{}^\circ \,,\text{ }120{}^\circ \] |
| B. | \[95{}^\circ \,,\text{ }120{}^\circ \] |
| C. | \[95{}^\circ \,,\text{ }150{}^\circ \] |
| D. | \[120{}^\circ \,,\text{ }180{}^\circ \] |
| Answer» C. \[95{}^\circ \,,\text{ }150{}^\circ \] | |