Which of the following will be most readily dehydrated in acidic condition

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

In which of the following pair, both the ores are not of same type

1.  Zincite - Cassiterite

2.  Siderite - Lime stone

3.  Galena - Cinnabar

4.  Sylvine - Anglesite

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4
Correct Answer :

Sylvine - Anglesite


Explanation :
No Explanation available for this question

Which of the following pairs of elements forms about 75% of the total constituents of the earth

1.  Nitrogen and silicon

2.  Oxygen and silicon

3.  Oxygen and nitrogen

4.  Oxygen and nitrogen

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4
Correct Answer :

Oxygen and silicon


Explanation :
No Explanation available for this question

Extraction of silver from Ag2S by the use of sodium cyanide is an example of

1.  Roasting

2.  Hydro metallurgy

3.  Electro metallurgy

4.  Smelting

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4
Correct Answer :

Hydro metallurgy


Explanation :
No Explanation available for this question

Which of the following metal is obtained by leaching its ore with dilute cyanide solution

1.  Al

2.  Cu

3.  Zn

4.  Zn

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4
Correct Answer :

Zn


Explanation :
No Explanation available for this question

The third most abundant element in the earth's crust is

1.  Fe

2.  Al

3.  Si

4.  Ca

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4
Correct Answer :

Al


Explanation :
No Explanation available for this question

The purpose of smelting an ore is to

1.  Oxidise it

2.  Reduce it

3.  Obtain an alloy

4.  Obtain an alloy

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4
Correct Answer :

Reduce it


Explanation :
No Explanation available for this question

The elements present in haemoglobin, sea weeds and chlorophyll are respectively

1.  Fe, Zn, Mg

2.  Fe,I2, Mg

3.  Zn, Fe, K

4.  Zn, Fe, K

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4
Correct Answer :

Fe,I2, Mg


Explanation :
No Explanation available for this question

Froth floatation process is based on

1.  Electrical property of the ore particles

2.  Specific gravity of the ore particles

3.  Magnetic properties of the ore particles

4.  Wetting properties of the ore particles

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4
Correct Answer :

Wetting properties of the ore particles


Explanation :
No Explanation available for this question

In electro - refining the impure metal is made

1.  Anode

2.  Cathode

3.  Anode or cathode

4.  Electrolyte

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4
Correct Answer :

Anode


Explanation :
No Explanation available for this question
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