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#### Solutions One Mark Questions

11th Standard

Reg.No. :
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Chemistry

Time : 00:30:00 Hrs
Total Marks : 10
10 x 1 = 10
1. The molality of a solution containing 1.8g of glucose dissolved in 250g of water is

(a)

0.2 M

(b)

0.01 M

(c)

0.02 M

(d)

0.04 M

2. Which of the following concentration terms is/are independent of temperature

(a)

molality

(b)

molarity

(c)

mole fraction

(d)

9a) and (c)

3. The Henry's law constant for the solubility of Nitrogen gas in water at 350 K is 8 × 104 atm. The mole fraction of nitrogen in air is 0.5. The number of moles of Nitrogen from air dissolved in 10 moles of water at 350K and 4 atm pressure is

(a)

4 x 10-4

(b)

4 x 104

(c)

2 x 10-2

(d)

2.5 x 10-4

4. Which one of the following is incorrect for ideal solution?

(a)

$\Delta H_{mix}=0$

(b)

$\Delta U_{mix}=0$

(c)

$\Delta P=P_{observed}-P_{calculated\ by\ raoults\ law}=0$

(d)

$\Delta G_{mix}=0$

5. The blocking of capillaires due to sudden release of bubbles of N2 gas in blood is known as

(a)

bends

(b)

blends

(c)

mends

(d)

all of these

6. Which of the following gas should have maximum value for kH?

(a)

He

(b)

H2

(c)

N2

(d)

CO2

7. The increase in the temperature of the aqueous solution placed in a closed vessel will result in its

(a)

molarity to increase

(b)

molarity to decrease

(c)

mole fraction to increase

(d)

mass % increase

8. In a binary solution

(a)

solvent may be liquid

(b)

solvent may be solid

(c)

solute may be gas

(d)

any of these

9. The temperature at which the vapour pressure of a liquid equals external pressure is called

(a)

freezing point

(b)

boiling point

(c)

melting point

(d)

critical temperature

10. Solubility of gas decreases in a liquid by

(a)

increase of temperature

(b)

cooling

(c)

increasing pH

(d)

decreasing pH