Science Chemistry MCQ-209

Science-Chemistry Questions for UPPSC,NDA/NA,CDSE,JKPSC,Civils,SSC Exams



In acid-base catalysis, the real catalyst is

 
 
 
 

Muddy water is purified by adding alum due to

 
 
 
 

The enzyme ptyalin used for digestion of food is present in

 
 
 
 

Reverse of swelling of gel is known as

 
 
 
 

The compound of a metal found in nature is called

 
 
 
 

A naturally occurring substance from which a metal can be profitably extracted is called

 
 
 
 

Rocy impurities present in a mineral are called

 
 
 
 

The forth flotation process is used for the concentration of

 
 
 
 

Copper pyrites (CuFeS2) are concentrated by

 
 
 
 

Cyanide process is used for extraction of

 
 
 
 

The most abundant element or earth curst is

 
 
 
 

Iron ore is concentrated by

 
 
 
 

The magnetic separation is used for increasing concentration of the following

 
 
 
 

The oil used in the floatation method for the purification of ores is

 
 
 
 

The purpose of smelting an ore to

 
 
 
 

Heating of pyrites in air to remove sulphur is known as

 
 
 
 

In blast furnance, iron oxide is reduced by

 
 
 
 

The highest temperature is achieved in which type furnace ?

 
 
 
 

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

 
 
 
 

A common metal used for the extraction of metals from their oxides by reduction is

 
 
 
 

Van Arkel method for purification of metals involves converting the metal to a

 
 
 
 

Zone refining is a method to obtain

 
 
 
 

In electro-refining the impure metal is made

 
 
 
 

In metallurgy flux is a substance used to convert

 
 
 
 

Which of one of the following metals is extracted by thermal reduction process ?