MCQOPTIONS
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MCQOPTIONS
This section includes 265 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Optimal temperature for enzymes is |
| A. | room temperature |
| B. | 35-37 °C |
| C. | 40-45 °C |
| D. | above 45 °C |
| Answer» C. 40-45 °C | |
| 252. |
If a piece of blood-rich liver is dipped in hydrogen peroxide, gas given off is |
| A. | hydrogen |
| B. | water vapors |
| C. | CO |
| D. | Oxygen |
| Answer» E. | |
| 253. |
Speed of a reaction can be measured through |
| A. | temperature |
| B. | pressure |
| C. | concentration |
| D. | a pH change |
| Answer» E. | |
| 254. |
At 100 °C, speed of reaction becomes |
| A. | 16 times faster |
| B. | 64 times faster |
| C. | 128 times faster |
| D. | 148 times faster |
| Answer» D. 148 times faster | |
| 255. |
Suitable apparatus to measure volume of gas given off is |
| A. | a tap funnel |
| B. | a conical beefle |
| C. | a graduated cylinder |
| D. | a gas syringe |
| Answer» E. | |
| 256. |
Factors affecting speed of reaction does not include |
| A. | concentration |
| B. | particle size |
| C. | change in mass |
| D. | pressure |
| Answer» D. pressure | |
| 257. |
Chemical substances slowing rate of chemical reaction is called as |
| A. | pressure |
| B. | concentration |
| C. | catalysts |
| D. | inhibitors |
| Answer» E. | |
| 258. |
ate of decomposition of Hydrogen Peroxide (H2O2) can be slowed down through |
| A. | glycerin |
| B. | manganese oxide |
| C. | vanadium oxide |
| D. | platinum |
| Answer» B. manganese oxide | |
| 259. |
Rate of reaction does not depend upon |
| A. | temperature |
| B. | concentration of reactants |
| C. | pressure |
| D. | theory of expanding gases |
| Answer» E. | |
| 260. |
During a chemical reaction, the |
| A. | mass of catalyst remains unchanged |
| B. | physical state of catalysts remain unchanged |
| C. | changes in the chemical composition of catalysts may be observed |
| D. | chemical composition of the catalyst may change |
| Answer» B. physical state of catalysts remain unchanged | |
| 261. |
Rate of reaction can be calculated by dividing change in mass or volume by |
| A. | time taken |
| B. | total mass |
| C. | amount of volume |
| D. | the temperature |
| Answer» B. total mass | |
| 262. |
Chemical substances speeding up rate of chemical reaction is called as |
| A. | pressure |
| B. | concentration |
| C. | catalysts |
| D. | inhibitors |
| Answer» D. inhibitors | |
| 263. |
Factors affecting speed of reaction include |
| A. | volume of gas |
| B. | change in mass |
| C. | pressure |
| D. | temperature change |
| Answer» D. temperature change | |
| 264. |
Haber process for manufacturing of ammonia requires catalyst of |
| A. | vanadium oxide |
| B. | iron |
| C. | platinum |
| D. | nickel |
| Answer» C. platinum | |
| 265. |
Milk turns sour due to |
| A. | conversion of lactose in lactic acid |
| B. | increased chemical changes |
| C. | conversion of lactic acid into lactose |
| D. | both a and b |
| Answer» E. | |