Extraction of Metals

Extraction of zinc from zinc blende is achieved by

In  the process of extraction of gold,

Roasted gold ore

$\left[X\right]+Zn\stackrel{}{\to }\left[Y\right]+Au$

Which one of the following is not an example of calcination?

Given below are two statements:
Statement I: In the metallurgy process,sulphide ore is converted to oxide before reduction.
Statement II: Oxide ores in general are easier to reduce.
In the light of the above statements, choose the most appropriate answer from the options given below: 

Which of the following is not an example of calcination.

Statement 1: Sulphides are converted into oxide first before the reduction.

Statement 2: Because oxides can be reduced easily.

A patient's abdomen (alimentary canal) can be examined by X-ray after administering which one of the following metal salts in the patient's meal?

Match List-I with List-II.

Choose the correct answer from the options given below:

Write any three ores of $\mathrm{Al}, \mathrm{Fe}, \mathrm{Zn}, \mathrm{Mg} \mathrm{and} \mathrm{Cu}$.

Select the code representing the nature of the given statements as true (T) or false (F).
I. Hydraulic washing is also known as gravity separation
II. In Hydraulic washing, the lighter ore particles are washed away and heavy gangue particles are settled down.
III. Magnetic separation can be used if either the ore or the gangue is attracted towards magnetic field.
IV. Collectors enhance the non wettability of the mineral and cresol stabilises the froth in the froth floatation method,

Find the number of native ores out of the given ores:

pyrolusite, chromite, siderite, cassiterite, calamine, argentite, limestone, chalcopyrite.

Heating pyrites to remove sulphur is called

Copper is extracted from

Cinnabar $\left(\mathrm{HgS}\right)$ and galena $\left(\mathrm{PbS}\right)$ on roasting often give their respective metals but zinc blende $\left(\mathrm{ZnS}\right)$ does not. Explain.

Give a brief account of the various methods used for obtaining metals from the roasted or calcined ores.

What do you mean by the term 'concentration of ores'. Describe briefly the various methods used for this purpose.

Give an example of halide ore of silver. Describe the process of extraction of silver with chemical equations from silver glance ore.

Heating pyrites to remove sulphur is called

During roasting most of the metals are converted into their respective oxides which are then reduced to the corresponding metals by using suitable reducing agents. However, it has been seen that in some cases, instead of the metal oxide, it is the metal which is isolated.

Read the above passage and answer the following questions, Name two metal sulphides which are converted into the corresponding metals during roasting. When does it happen so?