Metals

Q.

The metal(s) that can be found in free state in nature is/are _______.

1. Gold.

2. Platinum.

3. Silver.

4. all of these.

Q.

Which of the following metal have the highest melting and boiling point?

1. Iron

2. Gold

3. Copper

4. Tungsten

Q.

what is galvanisation?Write its applications.

Q. What are the uses of sonority property of metals

Q.

Why silver foil is used to decorate sweets ?

Q.

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

1. Gold

2. Aluminium

3. Iron

4. Lithium

Q.

Name the metal which is non-lustrous.

Q. What is the property that makes metals shine called?

1. Ductility
2. Sonorous
3. Lustre
4. Malleability

Q.

(a) What are metals ? Name five metals.

(b) What are non-metals ? Name five non-metals.

Q.

The methods for prevention of corrosion are:

1. Galvanising

2. Painting

3. Alloying

4. Skimming

Q.

Name two metals which are soft and can be easily cut with a knife.

Q.

Choose the correct order of melting and boiling points of metals?

1. Tungsten > Iron > Gold > Silver

2. Iron > Tungsten > Gold > Silver

3. Silver > Gold > Iron > Tungsten

4. Tungsten > Iron > Silver > Gold

Q.

Metals react by :

1. donating or accepting electron.

2. sharing electron.

3. donating electron.

4. accepting electron.

Q. Metals are generally solid. Which of the following metals is in the liquid state at room temperature?​

1. mercury
2. silver
3. aluminium
4. sodium

Q. Symbol of Cobalt is:

1. C
2. Cu
3. Cd
4. Co

Q.

Which of the following is non-crystalline?

1. Glass

2. Iron

3. Sugar

4. Salt

Q. Ability of metal to show brightness on the surface due to reflection of light is called __________.

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

Q.

The methods for prevention of corrosion are:

1. Galvanising

2. Painting

3. Alloying

4. All of the given options

Q. Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?​

1. iron
2. sodium
3. gold
4. magnesium

Q. Some of the following statements are incorrect. Find the incorrect statements and correct them.

(a) The property of metals by virtue of which they can be drawn into wires is called ductility.
(b) Metals are good conductor of electricity but poor conductor of heat.
(c) Articles made of metals usually produce ringing sound when struck hard.
(d) Oxides of non-metals and metals are acidic in nature.
(e) A less reactive metal replaces a more reactive metal from its salt solution in water.

Q.

What is the correct order of abundance of non-metals in earths crust?

1. Oxygen > Silicon > Sodium > Iron

2. Oxygen > Silicon > Phosphorus > Sulfur

3. Sulfur > Phosphorus > Silicon > Oxygen

4. Iron > Aluminum > Silver > Gold

Q.

Which metal is best for the human body?

Q.

Iron is the most widely used metal. Why?

Q.

Corrosion of iron can be prevented by alloying it with ______________.

Q. Complete the crossword given in Fig. 4.3 with the help of the clues.

Across​

1. Which is generally hard, ductile, malleable and sonorous.​

2. A metal is called so it can be drawn into wires.​

3. Metal bells are used because of this property.​

Down​

4. A metal generally used for making jewellery.​

5. A metal which is liquid at room temperature.​

6. A metal which reacts with acid as well as base to form​

hydrogen gas.​

7. Substances used to enhance the growth of plants.​

8. Property by virtue of which metals can be beaten into thin​

sheets.

Q.

Give reasons for the following:

a) Iron is used to construct bridges and houses.

b) Iron sheets are galvanized before use.

Q. Co is symbol for

1. Cobalt
2. Calcium
3. Silver
4. Copper

Q.

Metals and non - metals exist in which form?

1. Solid state

2. Liquid state

3. Gaseous state

4. All of the given options are correct

Q. Which among the following non metals is in liquid form?

1. Carbon
2. Bromine
3. Phosphorus
4. Hydrogen

Q. Which of the following statements regarding metals is true?

1. All metals are solid in nature.
2. Generally most of metals have high melting and boiling points.
3. Metals can be used to make handles of cooking utensils.
4. Gold is used generally to make electrical wires.