The concentration of pollutant in ppm (w/w). that has been measured at 450 mg per 150 kg of sample is :

The concentration of H_2O_2 sample in % w//v which is labelled as '10V' H_2O_2 is ________

Calculate the concentration of nitric acid in moles per litre in a sample which has a density 1.4 g*mL^(-1) and the mass percent of nitric acid in it being 69%.

A vacuum flask contain 0.3 kg of liquid paraffin whose temperature can be increased at the rate of 1^(@)C per minute using an immersion heater of power 12.3W. When a 19.2 W heater is used to heat 0.4 kg of liquid paraffin, in same flask, the rate of rise of temperature is 1.2^(@)C per minute. Find the specific heat of paraffin and the thermal capacity of the flask.

How would you convert a voltmeter that can measure up to 150 V to an ammeter which can measure current up to 8A ? Resistance of the voltmeter is 300Omega.

A vacuum flask contains 0.4 kg liquid paraffin whose temperature can be increased at the rate of 1^(@)C per minute using an immersion heater of power 12.3 W. When a heater of 19.2 W is used to heat 0.5 kg of liquid paraffin, in the same flask, the rate of rise temperature is 1.2^(@)C per minute. What is specific heat of the paraffin?

A water sample contains 1 millimole of Mg^(2+) ion per litre. calculate the hardness of water sample in ppm unit.

A water sample contains 1 millimole of Mg^(2+) ion per litre. Calculate the hardness of the water sample in ppm unit.