MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1300 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Air is |
| A. | Compound |
| B. | Element |
| C. | Mixture |
| D. | Solution |
| Answer» D. Solution | |
| 152. |
Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen |
| A. | Laws of conservation of mass |
| B. | Laws of multiple proportion |
| C. | Laws of reciprocal proportions |
| D. | Law of definite proportions |
| Answer» C. Laws of reciprocal proportions | |
| 153. |
Discovery of the nucleus of an atom was due to the experiment carried out by |
| A. | Bohr |
| B. | Rutherford |
| C. | Moseley |
| D. | Thomson |
| Answer» C. Moseley | |
| 154. |
The alpha-particles are |
| A. | High energy electrons |
| B. | Positively charged hydrogen irons |
| C. | High energy x ray radiations |
| D. | Double positively charged helium nuclei |
| Answer» E. | |
| 155. |
Washing soda is |
| A. | Sodium hydroxide |
| B. | Sodium carbonate |
| C. | Sodium bicorbonate |
| D. | Potassium chloride |
| Answer» C. Sodium bicorbonate | |
| 156. |
Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? |
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
| Answer» C. Option 3 | |
| 157. |
Modern periodic table is based on atomic number of the elements. The significance of atomic number was proved by the experiment of ________ |
| A. | Moseley's work on x-ray spectra |
| B. | Bragg's work on x-ray diffraction |
| C. | Mulliken's oil drop experiment |
| D. | Discovery of x-ray by roentgen |
| Answer» B. Bragg's work on x-ray diffraction | |
| 158. |
The freezing point of water at 760mm pressure is |
| A. | 0 k |
| B. | 273 k |
| C. | 273 c |
| D. | -273 c |
| Answer» C. 273 c | |
| 159. |
The most abundant metal in earth crust is |
| A. | Iron |
| B. | Magnesium |
| C. | Calcium |
| D. | Aluminium |
| Answer» E. | |
| 160. |
The metal which reacts most violently with with cold water is |
| A. | Calcium |
| B. | Sodium |
| C. | Magnesium |
| D. | Potassium |
| Answer» E. | |
| 161. |
An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number |
| A. | 25 |
| B. | 27 |
| C. | 35 |
| D. | 43 |
| Answer» D. 43 | |
| 162. |
Hydrogen bomb is based on the principle of |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Natural radioactivity |
| D. | Artificial radioactivity |
| Answer» C. Natural radioactivity | |
| 163. |
The discovery of neutron became very late because |
| A. | It is present in nucleus |
| B. | It is a fundamental particle |
| C. | It does not move |
| D. | It does not carry any charge |
| Answer» E. | |
| 164. |
The Kinetic energy of gas molecules |
| A. | Is unaffected by temperature variations |
| B. | Decreases with increase of temperature |
| C. | Increases with decrease of temperature |
| D. | Increases with increase of temperature |
| Answer» E. | |
| 165. |
Which one of the following laws directly expalins the law of coservation of mass |
| A. | Hund's rule |
| B. | Dalton's law |
| C. | Avogadro's law |
| D. | Berzelius hypothesis |
| Answer» D. Berzelius hypothesis | |
| 166. |
In atomic reactors,graphite is used as |
| A. | Lubricant |
| B. | Fuel |
| C. | Linear of the ractor |
| D. | Moderator |
| Answer» E. | |
| 167. |
Which is the Lightest of all the metals? |
| A. | Hydrogen |
| B. | Lithium |
| C. | Sodium |
| D. | Pottasium |
| Answer» C. Sodium | |
| 168. |
Which of the following is an element |
| A. | Alumina |
| B. | Brass |
| C. | Graphite |
| D. | Silicon |
| Answer» E. | |
| 169. |
Which of the following is the mixture |
| A. | Distilled water |
| B. | Gasoline |
| C. | Liquified petroleum gas |
| D. | Both (& (c) |
| Answer» E. | |
| 170. |
Energy produced in nuclear reaction is given by |
| A. | Charle's law |
| B. | Grahm's law |
| C. | Gay - lussac's law |
| D. | Einstein's law |
| Answer» E. | |
| 171. |
Who present the theory of radioactive disintegration |
| A. | Rutherford and soddy |
| B. | Soddy and fajan |
| C. | Thomson and rutherford |
| D. | Hahn and strassman |
| Answer» B. Soddy and fajan | |
| 172. |
A Radioactive subatance emits |
| A. | Alpha particles |
| B. | Beta particle |
| C. | Gamma particle |
| D. | All of the three |
| Answer» E. | |
| 173. |
The atoms of the elements having same atomic number but different mass number are called |
| A. | Isobar |
| B. | Isotopes |
| C. | Iso electronic |
| D. | Isotones |
| Answer» C. Iso electronic | |
| 174. |
Of the following elements, which one has the same oxidation state in all of its compounds? |
| A. | Hydrogen |
| B. | Fluroine |
| C. | Carbon |
| D. | Oxygen |
| Answer» C. Carbon | |
| 175. |
In isotopes the number of neutrons are |
| A. | Same |
| B. | Different |
| C. | Both |
| D. | None |
| Answer» C. Both | |
| 176. |
Of the following radiations, the most easily stopped by air |
| A. | Alpha - rays |
| B. | Beta - rays |
| C. | Gamma -rays |
| D. | X - rays |
| Answer» B. Beta - rays | |
| 177. |
In the making of jewels, gold is usually mixed with |
| A. | Zinc |
| B. | Tin |
| C. | Copper |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 178. |
Which of the following is called 'the King of Chemicals' ? |
| A. | Nitric acid |
| B. | Hydrochloric acid |
| C. | Silver nitrate |
| D. | Sulphuric acid |
| Answer» E. | |
| 179. |
Whcih one is the compound in the following |
| A. | Mercury |
| B. | Ozone |
| C. | Air |
| D. | Ammonia |
| Answer» D. Ammonia | |
| 180. |
Milk is a |
| A. | Mixture |
| B. | Element |
| C. | Metal |
| D. | None of these |
| Answer» B. Element | |
| 181. |
The oldest known organic compound is |
| A. | Urea |
| B. | Methane |
| C. | Acetic acid |
| D. | Benzene |
| Answer» D. Benzene | |
| 182. |
Which one is not the isotopes of hydrogen |
| A. | Protium |
| B. | Deuter |
| C. | Tritium |
| D. | All |
| Answer» D. All | |
| 183. |
If people sleep in closed rooms where charcoal fire is burning, they die due to |
| A. | Carbon monoxide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Phosgene |
| Answer» B. Carbon dioxide | |
| 184. |
Which is the gas used for making vegetables and vanaspathi from vegetable oils? |
| A. | Hydrogen |
| B. | Nitrogen |
| C. | Argon |
| D. | Helium |
| Answer» B. Nitrogen | |
| 185. |
Is C2 Paramagnetic or Diamagnetic? |
| A. | Paramagnetic |
| B. | Diamagnetic |
| C. | Ferromagnetic |
| D. | Can't be determined |
| Answer» C. Ferromagnetic | |
| 186. |
Which of the following is the strongest acid? |
| A. | Clch2cooh |
| B. | Brch2cooh |
| C. | Fch2cooh |
| D. | Ich2cooh |
| Answer» D. Ich2cooh | |
| 187. |
Nucleons are |
| A. | Protons and neutrons |
| B. | Neutrons and electros |
| C. | Protons and electrons |
| D. | Protons, neutrons and electrons |
| Answer» B. Neutrons and electros | |
| 188. |
Number of moles of CO2 present in 24 grams of carbon is |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 189. |
In addition to nitric acid, another acid which may render iron passive is |
| A. | Acetic acid |
| B. | Oxalic acid |
| C. | Chromic acid |
| D. | Citric acid |
| Answer» D. Citric acid | |
| 190. |
Which one of the following can be oxidised to the corresponding carbonyl compound: |
| A. | 2-methyl-2-hydroxy propane |
| B. | 2-hydroxy propane |
| C. | O-nitrophenol |
| D. | Phenol |
| Answer» C. O-nitrophenol | |
| 191. |
Neutrino has |
| A. | Charge +1, mass 1 |
| B. | Charge 0, mas 0 |
| C. | Charge -1,mass 1 |
| D. | Charge 0, mass 1 |
| Answer» C. Charge -1,mass 1 | |
| 192. |
Dimond is |
| A. | An element |
| B. | A compound |
| C. | A mixture |
| D. | A liquid |
| Answer» B. A compound | |
| 193. |
A mixture of ethyl alcohol and water can be seperated by |
| A. | Evaporation |
| B. | Sublimation |
| C. | Using a seperating funnel |
| D. | Fractional distillation |
| Answer» E. | |
| 194. |
Select the correct statement (s). |
| A. | When energy is transferred to the system from the surrounding as work, the surrounding do work on the system and the value of work (w) positive. |
| B. | When energy is transferred from the system to the surrounding as work, work is done on the surrounding and the value of w is negative. |
| C. | Both (and (b) |
| D. | None of the above |
| Answer» D. None of the above | |
| 195. |
The atoms of the elements which have same number of neutrons are called |
| A. | Isobars |
| B. | Isotopes |
| C. | Isotones |
| D. | None |
| Answer» D. None | |
| 196. |
The atoms of the elements having same mass number but different atomic number are called |
| A. | Isotopes |
| B. | Isobars |
| C. | Isotones |
| D. | Isomers |
| Answer» C. Isotones | |
| 197. |
Glass is a.........mixture of metallic........... |
| A. | Homogenous, sulphates |
| B. | Homogenous, silicates |
| C. | Heterogenous, carbonates |
| D. | Heterogenous, nitrates |
| Answer» C. Heterogenous, carbonates | |
| 198. |
The element that has the highest first ionization potential is....... |
| A. | Oxygen |
| B. | Carbon |
| C. | Boron |
| D. | Nitrogen |
| Answer» E. | |
| 199. |
The process that takes place in the atom bomb is |
| A. | Nuclear fusion |
| B. | Nuclear fission |
| C. | Radioactive disintegration |
| D. | Chemical decomposition |
| Answer» C. Radioactive disintegration | |
| 200. |
Dust particles in the air of large industrial cities are removed by |
| A. | Sedimentation |
| B. | Electrophoresis |
| C. | Tyndall effect |
| D. | Brownian movement |
| Answer» C. Tyndall effect | |