Metals Reaction with Oxygen (Burnt in Air)

Q. Give reason :​
(f) Gold is mixed with copper and nickel.​ ​

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

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

Q. Name the main metal present in the following: ​
Chocolate wrappers​

Q. A metal which is neither ductile nor malleable is ​

1. Aluminium
2. Zinc
3. Silver
4. Copper

Q. (g) Name a metal that is the best conductor of electricity.​

Q. (a) Name a metal that is the most malleable.​ ​

Q.

What is formed when hot copper reacts with oxygen in air?

1. Oxide

2. Alloy

3. Metalloid

4. Degradation

Q. (a) Name a non-metal that is a good conductor of heat and electricity.​

Q. Which among the following elements cannot be turned into wire?

1. Aluminium
2. Carbon
3. Platinum
4. Copper

Q. Give four differences between metals and non-metals with reference to their​
(b) Conductivity of heat and electricity.​

Q. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

1. High melting point
2. Poor electrical conductivity
3. Resistant to corrosion
4. Good thermal conductivity

Q. is defined as the property of metals to be drawn into wires.

1. Malleability
2. Sonority
3. Ductility

Q. Which of the following can be easily drawn into wires?

1. Sulphur
2. Oxygen
3. Copper
4. Phosphorus

Q. Which among the following elements cannot be turned into wire?

1. Aluminium
2. Copper
3. Carbon
4. Platinum

Q. Write any five differences between metals and non-metals.

Q. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

1. Good thermal conductivity
2. Resistant to corrosion
3. Poor electrical conductivity
4. High melting point

Q. Identify the property by virtue of which a metal can be beaten into thin sheets along with the correct example of metals.

1. Property:- Malleability
   Example:- Granules of zinc
2. Property:- Ductility
   Example:- Bar of graphite
3. Property:- Malleability
   Example:- Lump of coal
4. Property:- Ductility
   Example:- Crystal of iodine

Q. If the burning magnesium ribbon is brought near the mouth of a jar containing carbon dioxide it continuous burning ? why?

Q. Observe the table and identify metals and non-metals. Select the correct option.

$\begin{array}{ccc}\text{Sl.No}& \text{Set-1}& \text{Set-2}\\ 1.& \text{Sodium (Na)}& \text{Oxygen (O)}\\ 2.& \text{Magnesium (Mg)}& \text{Chlorine (Cl)}\\ 3.& \text{Iron (Fe)}& \text{Nitrogen (N)}\\ 4.& \text{Gold (Au)}& \text{Sulphur (S)}\\ 5.& \text{Calcium (Ca)}& \text{Carbon (C)}\end{array}$

1. Set 1: Non-metals and set 2: Metals
2. Set 1: Metals and set 2: Non-metals
3. Both sets 1 & 2 are metals
4. Both sets 1 & 2 are non-metals

Q. Give four differences between metals and non-metals with reference to their​
(c) Malleability. ​

Q.

You can make a copper wire but not a coal wire. It is because:

1. copper is sonorous but coal is not.

2. copper is ductile but coal is not.

3. copper is malleable but coal is not.

4. when coal is tried to turn into wire, it start burning.

Q.

A metal X reacts with oxygen to form a compound which possess high melting point. The compound is also soluble in water. The element X is:

1. Calcium
2. Carbon
3. Silicon
4. Sulphur

Q.

Which option represents the correct characteristics of metals?

1. Metals are not ductile

2. Metals have good electrical and thermal conductivity.

3. Metals are brittle

4. Metals have low density

Q. is defined as the property of metals to be drawn into wires.

1. Sonority
2. Malleability
3. Ductility

Q. Metals are bad conductors of electricity.

1. False
2. True

Q. Choose the correct statement for aluminium.

1. It is a bad conductor of electricity.
2. It cannot be hammered into thin sheets.
3. It can be drawn into wire.
4. It is a bad conductor of heat.

Q. Which of the following metals can be cut into pieces with a knife?

1. Sodium and calcium
2. Barium and calcium
3. Sodium and potassium
4. Calcium and mercury

Q. _________ is defined as the property of metals to be drawn into wires.

1. Conductivity
2. Ductility
3. Malleability
4. Sonority

Q. Mention two uses of :​
(c) Gold​

Q. Which of the following can be easily drawn into wires?

1. Oxygen
2. Phosphorus
3. Sulphur
4. Copper