Most living organisms cannot survive at temperature above `45^(@)C`. How are some microbes able to live in habitats with temperatures exceeding` 100^(@)C`?

A barometer tube 90 cm long contains some air above mercury. The reading is 74.5 cm when the true pressure is 76 cm and the temperature is 15^(@)C . If the reading is observed to be 75.8 cm on a day when the temperature is 5^(@)C , what is the true pressure ?

The rate of reaction becomes 2 times for evergy 10^(@)C rise in temperature. How many times the rate of reaction will increase when temperature is increased from 30^(@)C to 80^(@)C

If a given mass of a gas occupies a volume 100 cc at one atmospheric pressure and a temperature of 100^(@)C . What will be its volume at 4 atmospheric pressure, the temperature being the same?

1 g of steam at 100^(@)C is passed into a calorimeter of water equivalent 10g containing water of mass 90 g. Find the resultant temperature of the mixture if the initial temperature of water is 27^(@)C .