What is the smallest unit on the celsius thermometer?

The thermometer is used to measure the temperature. There are several scales to determine the temperature, which are Celsius, Fahrenheit and kelvin. The range of measurement scales are different for each of the scales or unit of temperature. For Celsius scale earlier the lowest temperature was 0°C, but after the invention of absolute zero which is 0 K (K = Kelvin). The lowest temperature of Celsius scale is -273°C. Thus the smallest unit of Celsius scale is -273°C.      

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.