# Molarity

## Trending Questions

**Q.**Find the molality of 15% (w/w) solution of H2SO4.

- 1.09 m
- 2.05 m
- 1.64 m
- 1.80 m

**Q.**

What is a decimolar solution?

**Q.**100 mL of an H2SO4 solution that has a molarity of 1 M and density of 1.50 g/mL is mixed with 400 mL of water. If the final density of the resulting solution is 1.25 g/mL, the final molarity of the H2SO4 solution is:

- 4.40 M
- 0.145 M
- 0.520 M
- 0.227 M

**Q.**What is the molarity of an NaOH solution if 250 mL contains 1 mg of NaOH?

- 10−1 M
- 10−2 M
- 10−4 M
- 10−3 M

**Q.**With increase of temperature, which of these changes?

- Molality
- Weight fraction of solute
- Mole fraction
- Molarity

**Q.**8 g of NaOH is dissolved in 18 g of H2O. Find the mole fraction and molality (mol kg−1) of NaOH in the resultant solution.

- 0.2, 11.11
- 0.167, 22.2
- 0.2, 22.2
- 0.167, 11.11

**Q.**Calculate the resultant molarity on mixing 2500 mL of a 2.5 M HNO3 solution and 157.5 g of HNO3.

- 3.5 M
- 2.8 M
- 1.5 M
- 4.7 M

**Q.**What is the concentration of nitrate ions if equal volumes of 0.1 M AgNO3 and 0.1 M NaCl are mixed together

- 0.1 M
- 0.2 M
- 0.05 M
- 0.25 M

**Q.**What is molality of 30% (w/w) H2O2 aqueous solution?

- 8.82 m
- 10.67 m
- 12.60 m
- 15.60 m

**Q.**100 mL of a 1 M H2SO4 solution is diluted with 400 mL of water. Calculate the molarity of the resultant H2SO4 solution.

- 0.50 M
- 0.10 M
- 0.01 M
- 0.20 M

**Q.**How many mL of H2SO4 of density 1.8 g mL−1 containing 92.5 % by volume of H2SO4 should be added to 1 L of 40 % solution of H2SO4 (density 1.3 g mL−1) in order to prepare 50 % solution of H2SO4 (density 1.4 g mL−1)?

- 188
- 186
- 210
- 212

**Q.**100 mL of a 0.1 M HCl solution, 200 mL of a 0.2 M HCl solution, 300 mL of a 0.3 M HCl solution, 400 mL of a 0.4 M HCl solution and 500 mL of a 0.5 M HCl solution are mixed. 200 mL of this solution is diluted with 300 mL of water. What is the molarity of HCl in the resultant solution?

- 0.147 M
- 0.375 M
- 0.765 M
- 0.625 M

**Q.**

What is the unit of molality?

**Q.**100 mL of a 0.1 M HCl solution, 200 mL of a 0.2 M HNO3 solution and 200 mL of a 0.5 M NaOH solution were mixed. The resultant solution will be

- Acidic
- Basic
- Neutral
- Can't say

**Q.**100 mL of 1 M NaCl solution is mixed with 100 mL of 3 M HCl solution and 200 mL of 1 M CaCl2 solution. Which of the following statements is true?

- The ratio of concentrations of cations to anions is 34
- The ratio of cations to anions is 2
- Molarity of Cl−=12 M
- Molarity of Cl−=32 M

**Q.**Calculate the molarity of the resultant solution in each of the following cases:

i. 200 mL of 1 M HCl + 300 mL water

ii. 200 mL of 1 M HCl + 100 mL of 0.5 M HCl

- 0.4 M, 56 M
- 0.4 M, 0.5 M
- 0.2 M, 56 M
- 0.5 M, 0.5 M

**Q.**What is the molarity of KNO3 in a solution prepared by dissolving 3.75 g of KNO3 in water to make a 375 mL solution?

(Molar mass of KNO3 = 101 g/mol)

- 0.2 M
- 0.5 M
- 0.1 M
- 0.3 M

**Q.**If 200 mL of a standard 0.15 M NaOH solution is required to neutralize 30 ml of H2SO4, what is the molarity of acid?

- 2.0 M
- 0.5 M
- 1.5 M
- 1.0 M

**Q.**150 mL of a H2O2 sample was divided into two parts. The first part was treated with KI and the formed KOH required 200 mL of M2 H2SO4 for neutralization. The other part was treated with KMnO4, yielding 6.72 L of O2 at 1 atm and 273 K. Using the given % yields find the molarity of H2O2.

H2O2+2KI⟶I2+2KOH (Yield=40%)

H2O2+2KMnO4+3H2SO4⟶K2SO4+2MnSO4+3O2+4H2O (Yield=50%)

- 1.4 M
- 3.0 M
- 1.5 M
- 2.4 M

**Q.**50 mL of 0.05 M BaCl2 (aq) solution and 100 mL of 0.1 M of KCl (aq) solutions are mixed. Calculate the molarity of Cl− ions in the resulting solution.

- 0.33 M
- 0.10 M
- 0.66 M
- 1.33 M

**Q.**What is the molarity of a 49% H3PO4 solution by mass?

(Density of the solution = 1.33 g/mL)

- 0.66 M
- 4.9 M
- 6.65 M
- 5 M

**Q.**250 mL of a sodium carbonate solution contains 2.65 g of Na2CO3. If this solution is diluted to 1 L, what is the molarity of the resultant solution?

- 0.025 M
- 0.250 M
- 0.055 M
- 0.067 M

**Q.**

Which among the following contain 43.4% of sodium?

sodium bicarbonate

sodium nitrate

sodium carbonate

sodium chloride

**Q.**2 L of 2.5 M H2SO4 solution is diluted to 15 L. Calculate the molarity of the resulting solution.

- 1.25 M
- 0.15 M
- 0.78 M
- 0.33 M

**Q.**1 M HCl and 2 M HCl are mixed in volume ratio of 4:1. The resulting HCl solution is diluted to double its original volume. What is the final molarity of HCl solution?

- 0.75 M
- 1.2 M
- 0.6 M
- 1.5 M

**Q.**Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of NO−3 ions in the mixture will be:

- 0.1 M
- 0.05 M
- 0.20 M
- 0.15 M

**Q.**Calculate the volume of concentrated sulphuric acid (molarity = 18 M) required to prepare 250 mL of 2 M acid solution.

- 27.8 mL
- 15.4 mL
- 20.5 mL
- 23.6 mL

**Q.**Which of the following will give 60 ml of 0.4 M NaOH solution?

- 20 ml 1.2 M NaOH solution is mixed in 40 ml water
- 20 ml of 1 M NaOH solution is mixed with 40 ml of 0.1 M NaOH solution
- 0.4 g of NaOH and 20 ml of 0.7 M solution of NaOH are added to 40 ml water
- 0.48 g of NaOH is added to 60 ml of 0.2 M NaOH solution

**Q.**How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3?

(The concentrated acid is 70 % HNO3 by weight)

- 90 g
- 45 g
- 70 g
- 54 g

**Q.**A solution of H3PO4 is 98% by mass. Calculate the molarity and normality if the density of the solution is 1.8 g/mL.

- 18 M, 18 N
- 18 M, 54 N
- 6 M, 18 N
- 54 M, 18 N