Exceptions in Physical Properties

Q.

What are metalloids? Give examples.

Q.

Name two metals that possess a low melting point.

Q.

Name the metals that melt when kept on the palm. Explain the reason?

Q.

The elements which behave as metals and non-metals are called ________.

Q. All metals are found in solid state at room temperature except:

1. sodium
2. caesium
3. mercury
4. galluim

Q.

Which type of element exhibits both metallic and non-metallic behaviour?

1. Noble gas

2. Alkaline Earth Metals

3. Metalloids

4. Alkali Metals

Q.

Metals that melt in our hand are:

1. Iron and copper

2. Francium and uranium

3. Caesium and gallium

4. Thorium and radium

Q.

Why tin has an exceptionally low melting point?

Q.

Which of these is used to make cutting tools?

1. platinum

2. tin

3. diamond

4. graphite

Q.

Metals like potassium, calcium and sodium have low melting and boiling points.

1. True
2. False

Q.

Mercury is found in the ___ state at room temperature.

Q.

All non-metals do not conduct electricity.

1. True

2. False

Q.

White silvery metals that melts , when kept on the palm is ________ & ________

1. Gallium and Caesium

2. Sodium and Potassium

3. Silver and Platinum

Q.

Identify the non-metal which is lustrous in nature:

1. Copper
2. Silver
3. Iodine
4. Gold

Q. Which of the following is the characteristic of non-metals?

1. They are good conductors of electricity.
2. They are good conductors of heat.
3. They are ductile.
4. They are insulators.

Q.

Fill in the blanks:

_____ is the only metal which is in liquid state at room temperature.

Q.

Which of the following is a non-metal but conducts electricity which is actually a physical property of metals?

1. Carbon

2. Mercury

3. Iron

4. Gold

Q.

Are lanthanoids malleable?

Q. is the lustrous non-metal.

1. Fluorine
2. Iodine
3. Carbon

Q.

Which of the following is a non-metal but is lustrous (a physical property of metals)?

1. Fluorine

2. Iodine

3. Mercury

4. Carbon

Q.

Explain briefly :

Graphite is used in the manufacture of refractory crucibles.

Q.

Which of the following non-metal shows an exceptional physical property?

1. Nitrogen

2. Sulphur

3. Chlorine

4. Graphite

Q.

Given below is a table containing a few metals and nonmetals with exceptional properties. Fill the dark spaces by identifying X, Y and Z in the table.

1. X - Gallium (Ga), Y - Metal, Z - Lustrous

2. X - Gallium (Ga), Y - Metal, Z - Sonorous

3. X - Carbon (C), Y - Non-metal, Z - Lustrous

4. X - Silver (Ag), Y - Metal, Z - Ductile

Q.

A non-metal which conducts electricity among the following is:

1. carbon
2. potassium
3. graphite
4. diamond

Q.

Which of the following non-metal is used in the figure given below?

1. Iodine

2. Graphite

3. Mercury

4. Zinc

Q.

Bromine is the only non-metal which is liquid at room temperature.

1. False

2. True

Q.

Which of the following metal can be cut with a knife?

1. Gold

2. Lead

3. Sodium

4. Iron

Q. Identify the properties of the metals from the uses mentioned in the table given below.
$$\begin{array}{cc}\text{Uses}& \text{Property}\\ \text{Used to make foils to wrap food}& \text{X}\\ \text{Used to make electric wires}& \text{Y}\\ \text{Used to make ornaments}& \text{Z}\end{array}$$

1. X:- Metallic lustre

   Y:- Ductility

   Z:- Malleability
2. X:- Malleability

   Y:- Ductility

   Z:- Metallic lustre
3. X:- Malleability

   Y:- Metallic lustre

   Z:- Ductility
4. X:- Metallic lustre

   Y:- Malleability

   Z:- Ductility

Q.

6. Iodine is a lustrous metal.

1. True
2. False

Q.

Identify the non-metal which exists in liquid state from the options given.

1. bromine
2. iodine
3. caesium
4. aluminium