1. Combustion of a candle is A. physical change B. reduction reaction C. endothermic reaction D. exothermic reaction Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
2. Which law of the thermochemistry introduces the concept of entropy? A. Second Law B. Zeroth Law C. Third Law D. First Law Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
3. Which of the following is a closed system? A. Jet engine B. Tea placed in steel kettle C. Pressure cooker D. Rocket engine during propulsion Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
4. The entropy of perfectly crystalline solid at absolute zero is A. positive B. negative C. Zero D. not definite Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
5. In the pressure cooker, cooking is fast because the increase in vapour pressure A. increases the specific heat B. decreases the specific heat C. decreases the boiling point D. increases the boiling point Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
6. Food cans are coated with tin but not with zinc because A. zinc is costlier than tin B. zinc has a higher melting point than tin C. zinc is more reactive than tin D. tin is more reactive than zinc Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
7. If a reaction is carried out at constant pressure, which of the following statement is correct? A. The reaction is likely to be endothermic B. The heat change is equal to the enthalpy change C. The reaction is likely to be exothermic D. The heat change is equal to the change in temperature Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
8. The working of a dry cell is based on A. decomposition reaction B. spontaneous oxidation reduction reaction C. combination reaction D. electrolysis Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
9. The electrochemical cell stops working after sometime because A. electrode potential of both electrodes becomes zero B. one of electrodes completely vanishes C. electrode potential of both electrodes equalizes D. the reaction reverses its direction Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
10. The life span of a Daniell cell may be increased by A. larger Zn electrode B. larger Cu electrode C. lowering the temperature D. lowering the concentrations Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
