MCQOPTIONS
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MCQOPTIONS
This section includes 68 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The value of n in the following equation is Cr |
| A. | 6 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 52. |
The oxidation number of iron in Fe |
| A. | +2 |
| B. | +3 |
| C. | 8/3 |
| D. | 2/3 |
| Answer» D. 2/3 | |
| 53. |
The oxidation state of Cr in K |
| A. | +7 |
| B. | +6 |
| C. | +3 |
| D. | +2 |
| Answer» C. +3 | |
| 54. |
Oxidation number of 'S' in Na |
| A. | + 0.5 |
| B. | 2.5 |
| C. | +4 |
| D. | +6 |
| Answer» C. +4 | |
| 55. |
A redox reaction is |
| A. | proton transfer reaction |
| B. | ion combination reaction |
| C. | a reaction is solution |
| D. | electron transfer reaction |
| Answer» E. | |
| 56. |
The oxidation number of Fe in K |
| A. | +6 |
| B. | +4 |
| C. | +3 |
| D. | +2 |
| Answer» E. | |
| 57. |
The conversion of Fe |
| A. | oxidation |
| B. | reduction |
| C. | ionisation |
| D. | nuclear reaction |
| Answer» B. reduction | |
| 58. |
The oxidation number of nitrogen is NO |
| A. | -1 |
| B. | +2 |
| C. | +3 |
| D. | +5 |
| Answer» E. | |
| 59. |
A reducing agent is a substance which can |
| A. | accept electrons |
| B. | donate electrons |
| C. | accept protons |
| D. | donate protons |
| Answer» C. accept protons | |
| 60. |
The redox reaction, Na |
| A. | Same as its molecular weight |
| B. | 1/2 x its molecular weight |
| C. | 1/3 x its molecular weight |
| D. | 1/4 x its molecular weight |
| Answer» B. 1/2 x its molecular weight | |
| 61. |
What is the oxidation number of sulphur in SO |
| A. | -2 |
| B. | +2 |
| C. | +6 |
| D. | 8 |
| Answer» D. 8 | |
| 62. |
Oxidation is defined as : |
| A. | loss of electrons |
| B. | gain of electrons |
| C. | gain of protons |
| D. | loss of protons |
| Answer» B. gain of electrons | |
| 63. |
Starch iodide paper is used to test for the presence of |
| A. | iodine |
| B. | iodide iron |
| C. | oxidising agent |
| D. | reducing agent |
| Answer» D. reducing agent | |
| 64. |
Oxidation number of N in NH |
| A. | -3 |
| B. | +5 |
| C. | -3 and +5 |
| D. | +3 and -5 |
| Answer» D. +3 and -5 | |
| 65. |
The important metal used with |
| A. | carbon |
| B. | tin |
| C. | charomium |
| D. | aluminium |
| Answer» D. aluminium | |
| 66. |
Which one of the following is the correct sequence of the given elements in the |
| A. | Iodine -Bromine- Chlorine-Fluorine |
| B. | Bromine- Iodine- Chlorine-Fluorine |
| C. | Bromine- Iodine- Fluorine-Chlorine |
| D. | Iodine -Bromine- Fluorine-Chlorine |
| Answer» B. Bromine- Iodine- Chlorine-Fluorine | |
| 67. |
In which one of the following situations a |
| A. | Common salt is exposed to air |
| B. | Coal is burnt in air |
| C. | Sodium is placed in water |
| D. | Iron is kept in moist air |
| Answer» B. Coal is burnt in air | |
| 68. |
Which among the following elements (metals) |
| A. | Cadmium |
| B. | Lead |
| C. | Chromium |
| D. | Nickel |
| Answer» C. Chromium | |