Universal Solvent

Q.

What is a polar and a non-polar solute

Q. If 12.6g of NaHCO3 are added to 30.0g of CH3COOH solution, the residue is found to weigh 36g .what is the mass CO2 released on the reaction.

Q.

Sugar does not dissolve in water. (True or False)

1. True
2. False

Q. Name two gases which are essential for the survival of aquatic animals and plants

Q.

When we heat a coloured salt, it turns into white coloured __________ salt.

1. Water of crystallisation

2. Hydrated

3. Anhydrous

4. Polar

Q.

An equal amount of heat is supplied to the same amount of coconut oil and water. Both of them were initially at the same temperature. The temperature of coconut oil is ___ that of water.

1. more than

2. colder than

3. less than

4. equal to

Q.

Oxygen is a universal solvent.

1. True

2. False

Q. Living organisms cannot survive even for few minutes without ______ .

1. air
2. clothes
3. water
4. food

Q. When an iron nail is dropped in water, it will ____.

1. float
2. sink
3. freeze
4. burn

Q. How is oxygen made and stored artificial ly

Q.

___ is the second most important subtance on the Earth after air.

Q. Which gas is most soluble in water?

1. $He$
2. $N{H}_3$
3. $C{O}_2$
4. $H_2$

Q.

Pure water is a colourless liquid having a fine taste

1. True
2. False

Q.

In soda water the solute is

1. a solid

2. a gas

3. a liquid

4. water

Q. An open U-tube contains Mercury. When 13.6 cm of water is poured into one of the arms of the tube, then the mercury rise in the other arm from its initial level is?

Q. What is present in air and what is complete chemistry?

Q.

Give a reason for the following:

Boiled water tastes flat.

Q. When an iron nail is dropped in water, it will ____.

1. freeze
2. sink
3. burn
4. float

Q.

In an aqueous solution , the solvent is _______.

Q.

Give example for non aqueous solvents.

Q. State two advantages of gases like carbon dioxide and oxygen dissolved in water.

Q. From the following select the metal for which maximum prescribed concentration in drinking water in minimum.

1. Cd
2. Mn
3. Fe
4. Cu

Q.

TYPE OF SALT IN PASHAN LAKE

Q.

On comparison with water, which of these is true about sulphuric acid?

1. Water has higher boiling point than sulphuric acid.

2. The melting point of sulphuric acid is higher than water.

3. Both water and sulphuric acid are liquid at room temperature.

4. The density of water is lower than that of sulphuric acid.

Q. When an iron nail is dropped in water, it will ____.

1. burn
2. freeze
3. sink
4. float

Q. Assertion (A): Hard water gives easy lather with soap.
Reason (R): Salts of calcium and magnesium react with soap to form insoluble salts.

1. (A) and (R) both are correct and (R) is the correct explanation of (A).
2. (A) and (R) both are correct but (R) is not the correct explanation of (A).
3. (A) is correct but (R) is not correct.
4. (A) is not correct but (R) is correct.

Q.

___ compounds show electrolytic conduction in aqueous solution.

Q. Name the two salts which makes the water hard.

Q. What is the importance of dissolved salts in water?

Q.

Deionised water is obtained by

1. Calgon's process

2. Clarke's process

3. Ion exchange process

4. Permuted process