Extraction of Copper

Q.

Explain the properties of alloys are different from those of constituent metals

Q.

Which of the following metals is present in the anode mud during the electrolytic refining of copper ??

A)Na

B)Al

C)Au

D)Fe

Q. In electroplating the metal that has to be coated is taken as cathode why?

Q.

Oxidation is a process that involves

1. The loss of electrons

2. The gain of hydrogen

3. The gain of electrons

4. No change in electrons

Q.

What is an alloy and how are alloys considered as solid solutions?

Q.

Which metal is refined by the Mond process?

Q.

The Homogeneous mixture of two or more metals or a metal and a non-metal is called an:

1. Both alloy and ore

2. Alloy

3. Ore

4. Mineral

Q.

Draw a neat and well-labelled diagram for electrolytic refining of copper.

Q.

Is copper more reactive than iron? Give a chemical reaction in support of your answer.

Q.

The formula of iron (III) sulphate is _____________.

Q. Pig iron, mixed with scrap iron and coke is melted in special furnace to make ___ iron.

1. Wrought
2. Raw
3. Cast
4. Slag

Q.

Non metals cannot undergo displacement reactions.

1. True

2. False

Q.

What is the electrolyte used for nickel electroplating?

Q.

Substance which is reduced is reducing agent ....if yes or no why ...

Pls help me with detail explanation of reduction , oxidation reactions and redox reactions

Q.

Silver articles turn black on exposure to air. This is an example of:

1. Oxidation reaction

2. Displacement reaction

3. Reduction reaction

4. Redox reaction

Q.

What is an oxidation reaction ? Identify in the following reactions :
(i) the substance oxidised (ii) the substance reduced.
$ZnO+C\to Zn+CO$

Q.

The two main metals in Bronze are:

(A) Copper and zinc

(B) Copper and lead

(C) Copper and Nickel

(D) Copper and tin

1. (A ) Copper and zinc

2. (B) Copper and lead

3. (C) Copper and Nickel

4. (D) Copper and tin

Q. Choose the odd one out :

1. Steel
2. Copper
3. Bronze
4. Brass

Q.

The article to be electroplated is always placed at__.

Q.

Define the following terms:

1. Metallurgy

2. Minerals

3. Ores

Q.

Differentiate between oxidation and reduction reaction?

Q.

When copper sulfate solution is electrolyzed with copper electrodes, the blue copper ions are discharged at the cathode and get deposited as copper, yet the blue color of the solution does not fade.Explain.

Q.

Impurities deposited during purification of copper by refining is called___

Q. Question 22
An alloy is:
(a) an element.
(b) a compound.
(c) a homogeneous mixture.
(d) a heterogeneous mixture.

Q.

The principle behind froth floatation method involves the difference in the ________of the ore and the gangue particles.

1. solubility properties

2. wetting properties

3. weight

4. specific gravity

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

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

Q.

Question 13
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice.

Explain why these sour substances are effective in cleaning the vessels.

Q.

A few elements in order of decreasing reactivity are: $\mathrm{K}>\mathrm{Ca}>\mathrm{Mg}>\mathrm{Fe}>\mathrm{H}>\mathrm{Sb}>\mathrm{Au}$. Identify the incorrect statement.

1. $\mathrm{Au}$ is the weakest reducing agent.

2. $\mathrm{K}$ is the strongest oxidising agent.

3. The oxide of $\mathrm{Sb}$ can be reduced with hydrogen.

4. $\mathrm{Ca}$ displaces hydrogen from water more easily than $\mathrm{Fe}$.

Q.

Which of the following metal is always a constituent of an amalgam?

1. Copper

2. Mercury

3. Iron

4. Zinc

Q. Which of the following are the methods used for the extraction of metals from its ores?

1. Concentration or Dressing
2. Extraction of crude metal
3. Refining or purification of the metal
4. All of the above