Water

Q. Can liquids be compressed ?

Q.

The halogen which is liquid at room temerature_____.

Q.

Arrange the following in decreasing percentage of freshwater contained in them:
groundwater, frozen form (glaciers and polar ice caps), rivers, atmosphere.

1. groundwater, glaciers, rivers, atmosphere

2. glaciers, groundwater, rivers, atmosphere

3. rivers, glaciers, groundwater, atmosphere

4. glaciers, atmosphere, groundwater, rivers

Q. A compound of metal (M) and nitrogen (N)with formula M2N3 contains 28% of nitrogen. The atomic mass of metal M is

Q.

Explain the term potable water.

Q.

How does boiling point of liquid varies with pressure? explain

Q. Arrange the following elements in the increasing order of their solubility at a given temperature.

1. Helium
2. Nitrogen
3. Carbon monoxide
4. Oxygen
5. Methane

Q.

What are compounds? Name any four compounds.

Q.

What causes the violence associated with torrential rain?

Q.

What are the chemical properties of metals?

Q.

Sugar solution is an example of:

1. A mixture

2. All of the above

3. An element

4. A compound

Q.

Define the term potable water

Q. The enthalpy of hydrogenation of cyclohexene is - 119.5 kJ per mole. if resonance energy of benzene is -150.4 kJ per mole, its enthalpy of hydrogenation would be a) - 508.8 kJ/mole b) - 208.1 kJ/mole c) - 269.9 kJ/ mole d) - 358.5 kJ/ mole

Q. 4.095 X 10 nitrogen atoms are filled in an enclosed gas cylinder of capacity 2 litre. The number ofmoles of nitrogen gas in the cylinder is?

Q.

What type of pollution is shown in the image?

1. Agriculture waste
2. Water pollution
3. Air pollution
4. Land pollution

Q.

Iron and sulphur can form:

1. A compound only

2. A mixture only

3. Both compound and mixture

4. A solution only

Q. Metals react with water to form the metal oxide and ______.

1. hydrogen gas
2. acid
3. water gas
4. non-metal oxide

Q.

Conversion of solid-state to a liquid state is called fusion. What is meant by the latent heat of fusion?

Q. Human body comprises of ____ percentage of water

1. 70

Q.

Natural water fit for human consumption is called _________________ water.

Q.

What are the causes of water pollution? How can you reduce water pollution? [3 MARKS]

Q. Difference between a Mixture and a Compound

Q.

Sugar solution is an example of:

1. An element

2. A compound

3. A mixture

4. All of the above.

Q.

Name the following: Water that is fit for drinking

Q. A solid whose volume does not change with temperature floats in a liquid. For two different temperature t1 and t2 of the liquid, fractions f1 and f2 of the volume of the solid remain submerged in the liquid. The coefficientof volume expamsion of the liquid is equal to ___________

Q.

Boiling takes place from

1. Surface of the liquid

2. Whole liquid

3. Bottom of the liquid

4. None of the above

Q.

Most of the water on the Earth's surface is found in

1. oceans and seas

2. underground sources

3. rivers

4. glaciers

Q. Which among the following is the universal solvent?

1. Water
2. Hydrogen
3. Nitrogen
4. Oxygen

Q.

Metals react with water to form metal oxide and _______ .

1. Acid

2. Hydrogen Gas

3. Non-Metal Oxide

4. Water Gas

Q. The process of obtaining salt from sea water involves:

1. evaporation
2. condensation
3. sublimation
4. none of these