Concentration Terms

Q.

The molarity of 0.006 mole of NaCl in 100ml solution is:

1. 0.066
2. 0.6
3. 0.06
4. 0.006

Q.

25 ml of 3.0 M HNO₃ are mixed with 75 ml of 4.0 M HNO₃. If the volumes are additive, the molarity of the final mixture would be:

1. 3.25 M

2. 4.0 M

3. 3.75 M

4. 3.50 M

Q.

If 5.85 g of NaCl (molecular weight 58.5) is dissolved in water and the solution is made up to 0.5 litre, the molarity of the solution will be

1. 0.4

2. 0.2

3. 0.1

4. 1.0

Q.

A mixture has 18 g water and 414 g ethanol. The mole fraction of water in mixture is (assume ideal behaviour of the mixture)

1. 0.1

2. 0.4

3. 0.7

4. 0.9

Q.

How much NaOH is required to neutralise 1500 cm³ of 0.1 N HCl?

1. 60 g

2. 4 g

3. 6 g

4. 40 g

Q.

The number of molecules in 4.25 g of ammonia is approximately

1. 0.5X10²³

2. 1.5X10²³

3. 3.5X10²³

4. 2.5X10²³

Q.

The amount of anhydrous Na₂CO₃ present in 250 ml of 0.25 M solution is

1. 6.625 g

2. 6.225 g

3. 66.25 g

4. 6.0 g

Q.

If 5.85 gms of NaCl are dissolved in 90 gms of water, the mole fraction of NaCl is

1. 0.2

2. 0.01

3. 0.3

4. 0.0196

Q. Calculate the mass of $K_{2}C{r}_2{O}_7$ required to produce $252g{I}_2$ from $KI$ solution.
$K_{2}C{r}_2{O}_7+KI\to C{r}^{3+}+I_2$

(Molar mass of $K_{2}C{r}_2{O}_7$ is $294gmo{l}^{-1}$)

1. $49g$
2. $98g$
3. $4.9g$
4. $9.8g$

Q.

20 ml of HCl solution requires 19.85 ml of 0.01 M NaOH solution for complete neutralization. The molarity of HCl solution is

1. 0.0099

2. 0.099

3. 0.99

4. 9.9