Corrosion of Metals

Q.

Which of the following is an alloy of mercury with silver and tin as a metal?

1. Steel

2. Brass

3. Magnalium

4. Dental amalgam

Q.

Which of the following alloy is used for making scientific instruments?

1. Bronze

2. Brass

3. Solder

4. Amalgam

Q.

What is an amalgam? State its use with an example.

Q.

Which of the following alloy contains mercury as base metal?

1. German silver

2. Magnalium

3. Amalgam

4. Alnico

Q.

What is Galvanization? How can it prevent the rusting of iron?

Q. Silver amalgam is an alloy of ______ with silver.

1. mercury
2. tin
3. carbon
4. gold

Q. Silver amalgam is an alloy of _______ with silver.

1. mercury
2. gold
3. copper
4. silver

Q. Silver amalgam is an alloy of ______ with silver.

Q. Cooking utensils get blackened at the bottom after some time because of

1. irregular shape
2. incomplete combustion
3. improper cooking measures
4. complete combustion

Q. Silver amalgam is an alloy of with silver.

1. mercury
2. carbon
3. gold

Q. Alloying is a very good method of improving the properties of a metal. Alloys are mixtures of metals with ___.

1. Non-metals
2. Metals
3. either A or B can be used
4. Neither A nor B can be used

Q. Statement 1: Rusting of iron can be prevented by forming a layer of a substance on it.
Statement 2: The layer prevents the metal from interacting with the atmosphere.

1. Both statements are false.
2. Only statement 1 is true.
3. Only statement 2 is true.
4. Both statements are true.

Q. Identify the chemical process depicted in the pictures given below.

1. 
2. 
3. 
4. 

Q. Which of the following methods is not used in prevention of rusting of iron?

1. Galvanization
2. Painting
3. Greasing
4. Water wash

Q. Molten is used for coating iron in galvanisation.

1. lead
2. zinc
3. copper
4. iron

Q. Iron is mixed with carbon, nickel and chromium to form the alloy called ______.

1. stainless steel
2. aluminium oxide
3. bronze
4. brass

Q. Assertion (A): Silver objects become green and lose their shine with the passage of time
Reason (R): Silver reacts with carbon dioxide and moisture present in the atmosphere.

1. A is true but R is false.
2. Both A and R are true, and R is the correct explanation of A.
3. Both A and R are false.
4. Both A and R are true, but R is not the correct explanation of A.

Q. is the green colour coating that forms on copper when it is left open.

1. Copper sulphate
2. Copper chloride
3. Copper carbonate

Q. Steel is made from a combination of

1. Iron and Nickel
2. Iron and Cobalt
3. Iron and Carbon
4. Iron and Zinc

Q. Iron is mixed with carbon, nickel and chromium to form the alloy called ______.

1. stainless steel
2. brass
3. aluminium oxide
4. bronze