Question 1
Question: A mixture of oil and water is an example of _____________.
| 1. | compound |
| 2. | two elements |
| 3. | mixture |
| 4. | true solution |
Answer: 3
Question 2
Question: A mixture of mercury and copper is an example of _______.
| 1. | solid and solid |
| 2. | liquid and solid |
| 3. | solid and liquid |
| 4. | liquid and liquid |
Answer: 2
Question 3
Question: Which of these elements is not a metalloid?
| 1. | Tungsten |
| 2. | Germanium |
| 3. | Bismuth |
| 4. | Antimony |
Answer: 1
Question 4
Question: Which one of the following is monoatomic?
| 1. | Oxygen |
| 2. | Hydrogen chloride gas |
| 3. | Argon |
| 4. | Ammonia |
Answer: 3
Question 5
Question: Which of the following is not a mixture?
| 1. | Blood |
| 2. | Silver coins |
| 3. | Saliva |
| 4. | Plutonium |
Answer: 4
Question 6
Question: Which property does not describe a compound?
| 1. | It is a pure substance. |
| 2. | It is mixed in any proportion by mass. |
| 3. | It cannot be separated into constituents by physical means. |
| 4. | It is composed of two or more elements. |
Answer: 2
Question 7
Question: The quantity of solute present in a given amount of solution represents_______
| 1. | solubility |
| 2. | concentration |
| 3. | sublimity |
| 4. | saturation |
Answer: 2
Question 8
Question: In a colloidal solution________
| 1. | the size of a colloidal particle lies roughly between 0.1 nm to 1 nm. |
| 2. | the particles have a tendency to settle when the solution is left standing. |
| 3. | the particles pass through ultrafilter papers and animal and vegetable membranes. |
| 4. | the dispersed phase is uniformly distributed in the dispersion medium |
Answer: 4
Question 9
Question: When sodium oxide reacts with water it undergoes chemical change to form ________.
| 1. | hydrogen |
| 2. | sodium hydroxide |
| 3. | sodium nitride |
| 4. | sodium chloride |
Answer: 2
Question 10
Question: Chemical changes are __________.
| 1. | temporary, reversible and a new substance is produced |
| 2. | always accompanied by exchange of light |
| 3. | permanent, irreversible and a new substance is produced |
| 4. | never accompanied by exchange of light and heat energy |
Answer: 3
Question 11
Question: Which pair is a miscible liquid mixture?
| 1. | Methyl alcohol and acetone |
| 2. | Mercury and alcohol |
| 3. | Benzene and water |
| 4. | Carbon disulphide and water |
Answer: 1
Question 12
Question: Iron rod turns red on heating. The change is a______
| 1. | physical change |
| 2. | temporary |
| 3. | physical and chemical change |
| 4. | chemical Change |
Answer: 1
Question 13
Question: Which one of the following does not sublime?
| 1. | Camphor |
| 2. | Charcoal |
| 3. | Naphthalene |
| 4. | Iodine |
Answer: 2
Question 14
Question: Which technique is used to separate a solid-solid mixture?
| 1. | Sedimentation |
| 2. | Evaporation |
| 3. | Distillation |
| 4. | Sublimation |
Answer: 4
Question 15
Question: On adding excess salt to a solution, it shows no change in solubility. This shows________
| 1. | crystallization |
| 2. | slow Diffusion |
| 3. | saturation |
| 4. | dissolution |
Answer: 3
Question 16
Question: The process used to separate a mixture of ammonium chloride and iodine is ______.
| 1. | sublimation |
| 2. | magnetic separation |
| 3. | solvent extraction |
| 4. | chromatography |
Answer: 3
Question 17
Question: An example of a chemical change is _____.
| 1. | formation of clouds |
| 2. | glowing of an electric light |
| 3. | dropping sodium into water |
| 4. | dissolving of salt in water |
Answer: 3
Question 18
Question: A true solution is a _________.
| 1. | homogeneous mixture |
| 2. | heterogeneous mixture |
| 3. | pure compound |
| 4. | impure compound |
Answer: 1
Question 19
Question: Fractional crystallization is used to separate which of the following?
| 1. | Two solids |
| 2. | Two liquids |
| 3. | Two gases |
| 4. | A solid and a liquid |
Answer: 1
Question 20
Question: Tyndall Effect in colloids is due to _________.
| 1. | dispersion of light |
| 2. | merging of light rays |
| 3. | scattering of light |
| 4. | convergence of light rays |
Answer: 3
