Deliquescence

Q.

Define saturated, unsaturated and supersaturated solution with examples.

Q. Explain turbidity of water. How is turbidity measured? What causes water to become turbid? [3 MARKS]

Q. Are the crystals of salts really dry

Q.

Define and give the example of Deliquescence.

Q.

Why does magnesium powder reacts much more rapidly than magnesium ribbon with dilute sulphuric acid

Q.

What is efflorescence ? Name one compound which exhibits efflorescence . Support your answer by giving balanced equation .

Q. Define the terms efflorescence and deliquescence

Q.

On heating, a mixture of ${\mathrm{NH}}_4\mathrm{Cl}$ and ${\mathrm{KNO}}_2$ we get:

1. ${\mathrm{NH}}_4{\mathrm{NO}}_3$

2. ${\mathrm{KNH}}_4{\left({\mathrm{NO}}_3\right)}_2$

3. ${\mathrm{N}}_2$

4. $\mathrm{NO}$

Q. Rashmi was doing an experiment in which she took two samples of silicon and tried burning in air.She observed that sample 1 caught fire easily in the air while the sample 2 didn't catch fire.Can you help her out in identifying them?

1. Sample 1 - Amorphous, Sample 2 - Crystalline
2. Sample 1 - Crystalline, Sample 2- Amorphous
3. Sample 1 - Amorphous, Sample 2 - Amorphous.
4. Can't be identified

Q. How can Rice be cooked without any flames?
Related to acids , bases or salts only.
Not related to any variety of Rice.

Q. Which of the following is not an example of deliquescent substance?

1. Calcium chloride
2. Blue vitriol
3. Sodium hydroxide
4. Iron (III) chloride

Q. Which one of the following absorbs moisture from atmosphere?

1. Sodium carbonate
2. Sal ammoniac
3. Potassium nitrate
4. Calcium chloride

Q. Water soluble salt on exposure to the atmosphere absorbs moisture and change into liquid state. The substance is called as__________ and phenomenon as _________.

1. Efflorescence; Efflorescent
2. Deliquescence; Deliquescent
3. Deliquescent; Deliquescence
4. Efflorescent; Efflorescence

Q. For deliquescence to occur, the vapour pressure of water in the air must be greater than that of the saturated solution.

Q. Dissolve two spoons of common salt in half a cup of water.
Now if you want to get the salt back, what will you do?

Q. Which of the following substances are colloids?

1. Fog
2. Cloud
3. Foam
4. Cheese
5. Jelly
6. Lemonade
7. Sugar syrup
8. Alloy

Q. At what relative humidity will $N{a}_{2}HP{O}_4.7H_{2}O\left(s\right)$ deliquescent when exposed to the air at ${27}^{0}C$ ?

1. below $75\%$
2. above $7.0\%$
3. equal to $7.5\%$
4. above $7.5\%$