Physical Nature

Q.

Why does white phosphorus glow in the dark?

Q.

The lustre of a metal is due to:

1. Presence of free electrons

2. Its chemical inertness

3. Its high density

4. Its high polishing

Q.

What if francium reacts with water???

Q.

What causes the luster of a metal?

Q. Two examples of metals and non metals with low density

Q.

What are some examples of metallic bond and their combination

Is copper wire is a part of metallic bondage

Q. If no metals can form covalent bond with chlorine I. e they can share electrons with Chlorine then why can't they do the same with Hydrogen? Besides both chlorine and Hydrogen require only one electron

Q.

Name few uses of White Phosphorus

Q.

Find the odd one out. Give a reason for your answer.

Magnesium. mercury, manganese, and silver.

Q. Hydrogen gas is not widely used as a reducing agent because

1. hydrogen decomposes to atomic hydrogen at higher temperature.
2. hydrogen isomerises to ortho hydrogen at a higher temperature..
3. many metals form hydrides at lower temperature.
4. there is a risk of an explosion from oxygen and hydrogen in air.

Q.

Is red phosphorus illegal?

Q.

The lustrous property of a metal is due to

1. it's high density

2. it's high polishing

3. it's chemical inertness

4. presence of free electrons

Q.

State whether the following statement is true or false.

“All metals are lustrous.”

1. True
2. False

Q.

Explain the meaning of malleability and ductility? [3 MARKS]

Q. Metals are malleable but not ductile. State true or false.

1. True
2. False

Q.

Name a metal which

(e) does not possess lustre.

Q.

Is hydrogen flammable or not? If yes why is it so and if no why no??

Q. ________ is a metal that has a low melting point

1. Phosphorus
2. Gallium
3. Sulphur
4. All of these

Q. The lustrous property of a metal is due to

1. it's high density.
2. it's high polishing.
3. it's chemical inertness.
4. presence of free electrons.

Q.

Name two metals which are both malleable and ductile.

Q.

Metals are malleable but not ductile. State true or false.

1. True

2. False

Q.

Most of the metals are grey in colour; which one of the following is yellow?

1. Gold

2. Lead

3. Silver

4. Zinc

Q. Metals generally have very high melting and boiling points due to strong ___ bonds.

1. ionic
2. covalent
3. hydrogen
4. metallic

Q.

The lustre of a metal is due to:

1. Its high density

2. Its high polishing

3. Presence of free electrons

4. Its chemical inertness

Q.

The most ductile metal is:

1. Copper

2. Zinc

3. Gold

4. Silver

Q.

Metallic bond is unidirectional.

1. True
2. False

Q. Write a short note on the physical properties of non-metals

Q. The property by which metals can be beaten into sheets is known as _______.

1. lustre
2. ductility
3. malleability
4. sonority

Q.

Name:

A metal that is malleable and ductile.

Q. Metals are different from rocks, gases, salts, acids and bases. They have special properties, such as metallic lustre, conduction of heat and electricity and imparting colours to flames. These special properties are caused by the presence of mobile electrons in a structure with a special chemical bond. Can you identify it?

1. The hydrogen bond
2. The ionic bond
3. The covalent bond
4. The metal bond