One litre of a sample of hard water contain `4.44mg CaCl_(2) and 1.9mg "of" MgCl_(2)`. What is the total hardness in terms of ppm of `CaCO_(3)?`

1L of pond water contains 20mg of Ca^(2+) and 12mg of mg^(2+) ions. What is the volume of a 2N Na_2 CO_3 solution required to soften 5000L of pond water ?

10L of hard water required 5.6g of lime for removing haardness. Hence temporary hardness in ppm of CaCO_3 is :

Calculate the normal freezing point of a sample of sea water containing 3.8% NaCl and 0.12% MgCl_2 by mass. (K_f for water=1.86Km^-1)

A gascous mixture contains 56 g N_2, 44 g CO_(2) and 16 g CH_(4) . The total pressure of mixture is 720 mm. What is partial pressure of CH_(4) ?

A tea stall owner consumes in her shop 2""1/2 litres of milk in the morning and 1""1/2 litres of milk in the evening. What is the total amount of milk she uses in the stall?

RH_2 (ion exchange resin) can replace Ca^(2+) ions in hard water as RH_2+Ca^(2+)rarr RCa+2H^+ . If 1 L of hard water after passing through RH_2 has pH=3 then hardness in parts per million of Ca^(2+) is :

Vidya and Pratap went for a picnic. Their mother gave them a water bottle that contained 5 litres of water. Vidya consumed 2/5 of the water. Pratap consumed the remaining water. What fraction of the total quantity of water did Pratap drink?

A bag contains 4 red balls. What is the sample space if the experiment consisting of choosing : 2 balls ?

The closed containers of the same capacity and at the same temperature are filled with 44 g of H_(2) in one and 44 g of CO_(2) in the other . If the pressure of carbon dioxide in the second container is 1 atm , then pressure of hydrogen in the first container would be :