Metals Reaction with Oxygen (Burnt in Air)

Q.
Why Silver articles become black when exposed to air ?

Q.

Why is the nature of metallic oxides basic in nature?

Q.

The poorest conductor of heat is

1. aluminium

2. silver

3. gold

4. lead

Q.

Why is it that silver and gold do not corrode in moist air?

Q.

Name the non-metal which can conduct electricity.

Q. Give some examples where malleability and ductility of metals are used in our daily life.

Q.

——— is the only non-metal that is a good conductor of electricity.

Q.

What is meant by strategic metals? Name two metals which are considered strategic.

Q.

Why copper is called a metal?

Q.

State the special property of Duralumin.

Q.

Name the type of alloy used for making aircrafts

Q.

What will happen when magnesium ribbon burns

Q.

Name the properties for which Aluminium is used in cooking utensils.

Q. Rusting of iron takes place in the presence of _____ and moisture to produce iron ______.

1. hydrogen, hydroxide
2. oxygen, oxide
3. hydrogen, oxide
4. oxygen, hydroxide

Q.

Name one alloy each of Aluminium and Iron

Q.

How do metals oxide dissolved in water respond to litmus paper?

1. Blue litmus paper red

2. Red litmus paper blue

3. Not enough information provided

4. No change in litmus paper

Q.

Which of the following is a colourless gas having a choking smell of gun powder?

1. Silver sulphide

2. Sulphur dioxide

3. Phosphorous pentoxide

4. Magnesium oxide

Q.

The binary compound formed when an element combines with oxygen is called an ___.

Q.

Are metal oxides acidic?

Q. Rusting of iron takes place in the presence of _____ and moisture to produce iron ______.

1. oxygen, oxide
2. oxygen, hydroxide
3. hydrogen, oxide
4. hydrogen, hydroxide

Q.

Give two tests to confirm that a given colorless, odorless liquid is water.

Q.

Pure Gold is most malleable and ductile metal. Gold used in jewellery is harder. Give reason.

Q.

The best electrical conductor is

1. gold

2. copper

3. silver

4. aluminium

Q.

Which of the following is not true of metals?

1. Metals are good conductors of electricity.

2. Metals are malleable and ductile.

3. Metals form non-polar covalent compounds.

4. Metals will have $1$ or $2$ or $3$ electrons in their valence shell.

Q. What happens when a metallic oxide reacts with non metallic oxide? Give an example

Q.

The metals which are not ductile at ordinary temperature are:

1. Cu and Hg
2. Zn and Cu
3. Hg and Ag
4. Zn and Hg

Q. Which among the following reacts with steam?

1. Ag
2. Au
3. Fe
4. Pt

Q.

What is an alloy? Name the alloys and their constituents used for

cables, respectively.

Q. Which of the following is sonorous?

1. Metalloids

2. None of these

3. Non-Metals

4. Metals

Q.

An element burns in air to form an oxide.The aqueous solution of this oxide turns blue litmus paper red. State whether the element is a metal or non-metal.Name one such element.