A sample of well water contains 140 gm/m 3 Ca 2+ ions and 345 gm/m 3 N – McqOptions

MCQOPTIONS

1.	A sample of well water contains 140 gm/m 3 Ca 2+ ions and 345 gm/m 3 Na + ions. The hardness of the sample of water, expressed in terms of equivalent CaCO 3 in gm/m 3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)
A.	350
B.	485
C.	140
D.	345
Answer» B. 485

Discussion

No Comment Found

Related MCQs

The vapor pressure of liquids of similar chemical nature at any particular temperature __________ with increase in the molecular weight.
A \'limiting reactant\' is the one, which decides the __________ in the chemical reacation.
__________ is an intensive property.
The heat change for the reaction, C(s) 2S(s) → CS2(l), is 104.2 kJ. It represents the heat of
Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the \'corresponding states\'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly
Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm.
Heat capacity of air can be approximately expressed as, Cp = 26.693 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is
In the reaction, Ca 2H2O = Ca(OH)2 H2 ; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (atomic weight of calcium = 40)
A gas at 0Â°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be
An equation for calculating vapour pressure is given by, log 10 P = A - B(t + c). This is called the