The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg, respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?

The calorific value of a fuel is 40000 kj/kg. This fuel is most likely to be :

The calorific value and ignition temperature of fuel A are 55 kJ/g and 20^(@)C respectively. These values for another fuel B are 50 kJ/g and 80^(@)C respectively. Which of the two will be more ideal fuel if, on burning, the fuel A produces CO_(2),SO_(2) and SO_(3) as by-products while the fuel B produces CO_(2) and H_(2)O ? Give two reasons in support of your answer.

Calorific value and ignition temperature of fuel X are 75 kJ/g and 20^(@)C respectively. These values for fuel Y are 50 kJ/g and 75^(@)C respectively. On burning, the fuel Y produces only CO_(2) while fuel X produces CO_(2) and CO. Which of the two is a better fuel ? Give two reasons to support your answer.

You are provided with three watch glasses containing milk, petrol and mustard oil, respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why?

A closed system undergoes a process 1 to 2 for which the values W_(1-2) and Q_(1-2) are 50 kJ and -20 kJ respectively. If the system is returned to state 1 and Q_(2 to 1) is + 10 kJ the work done W_(2 to 1) is:

You have invented a new device to detect impurities of petrol. Which two advertising media would you use and why?

A petrol tank is in the form of a frustum of a cone of height 20 m with diameters of its lower and upper ends as 20 m and 50 m respectively. Find the cost of petrol which can fill the tank completely at the rate of Rs. 70 per litre. Also find the surface area of the tank

For a certain reaction X rarr Y the value of DeltaH and DeltaS are 50.50KJ mol^(-1) and 100.03JK^(-1) respectively. The temperature at which DeltaG=0 is