Noble Metals

Q. Carbon reacts with chlorine to form ccl4. 36gm of carbon was mixed with 142gm of cl2calculTe the mass of ccl4producedand the remaining mass of reactant.

Q.

Why aluminium foils are used to wrap food items?

Q.

………………… is the Latin name of silver.

Q.

Name the following

A coinage metal

Q.

___ and platinum are metals which do not get rust.

Q.

Is potassium a transition metal?

Q.

Write a brief note about the significance of copper.

Q. What are noble metals? Is there any other such classification of metals?

Q.

Why is granulated zinc used in laboratory preparation of hydrogen and why is hydrogen collected by downward displacement of water?

Q. The noble metals that are used as catalysts are:

1. platinum
2. palladium
3. sodium
4. magnesium

Q. Metals like silver, gold and platinum which do not corrode and do not react with oxygen even on strong heating are called ...................... metals.

1. Alkali
2. Noble
3. Alkaline earth metals
4. None of the above

Q.

Nitric acid is a/an ___ agent.

Q. Silver and gold do not react with oxygen.

1. True
2. False

Q. Identify a noble metal among the options given below.

1. Lithium
2. Calcium
3. Magnesium
4. Gold

Q.

Identify the metal X and Y from the characteristics mentioned in the table given below.

$\begin{array}{cc}\text{X}& \text{Y}\\ \text{Does not react with water and oxygen}& \text{Best conductor of electricity}\\ \text{Highly ductile material}& \text{Used to make ornaments}\\ \text{Most malleable substance}& \text{Best conductor of heat}\end{array}$

1. X:- Copper

   Y:- Aluminium

2. X:- Sodium

   Y:- Silver

3. X:- Gold

   Y:- Silver

4. X:- Gold

   Y:- Potassium

Q. Assertion :Heavy metals such as cadmium, mercury, nickel etc. are water pollutants. Reason: Heavy metals are not harmful to humans.

1. Assertion and Reason both are correct statements and Reason is the correct explanation for Assertion.
2. Assertion and Reason both are correct statements but Reason is not the correct explanation for Assertion
3. Assertion is correct statement but Reason is wrong statement
4. Assertion and Reason both are wrong statement.

Q. The non-metal which is liquid at room temperature is:

1. chlorine
2. fluorine
3. bromine
4. iodine

Q. Which of the following does not react with oxygen?

1. Potassium
2. Sodium
3. Magnesium
4. Gold

Q. Noble metals are not affected by:

1. air
2. water
3. heat
4. pressure

Q. Gold and silver are called noble metals because:

1. they do not react in their natural environment normally
2. ladies of royalty wear them as jewellery
3. they are worn by noblemen
4. even acids cannot dissolve them without strong heat

Q. Which if the following noble metal cannot dissolve in aqua regia?

1. Gold
2. Platinum
3. Silver
4. Palladium

Q.

Hydrogen is readily adsorbed by _______ at room temperature.

1. ammonia

2. sulphuric acid

3. platinum

4. zinc

Q. Find out the names of three metals and three non-metals from the given fig.

Q. Earlier silver was used for making mirror because:

1. silver is good conductor of electricity
2. silver is malleable and ductile
3. silver reflects 90% of light falling on it
4. silver reflects 100% of light falling on it

Q. Gold is mixed with copper to:

1. make gold soft
2. make gold hard
3. make gold more yellowish
4. give gold lustre

Q. Noble metals do not undergoes:

1. corrosion
2. oxidation
3. both $A$ and $B$
4. none of the above

Q. Which of the following metals forms an amalgam with other metals?

Q. Why does Cu not react with Ag?

Q. In the transition metal section of the periodic table exists a group of metals known as the Noble metals, which tend to resist oxidizing better than base metals resulting in a slow oxidation rate.
Which of the following is not considered to be a noble metal?

1. Gold
2. Nickel
3. Silver
4. Platinum

Q. Which of the following does not react with oxygen?

1. Potassium
2. Sodium
3. Magnesium
4. Gold