Science Chemistry MCQ-208

Science-Chemistry objective Quiz for UPPSC,CivilsPrelims,JKPSC,SSC,CDS,NDA,RBI,UPPSC Exams



Electrometallurgy is employed for the reduction of

 
 
 
 

When ore is heated generally in absence of air then process is called

 
 
 
 

When ore is heated generally in presence of air, then process is called

 
 
 
 

Reduction of oxide with carbon at high temperature is called

 
 
 
 

Flux reacts with the impurities to form fusible material which is known as

 
 
 
 

Ni is purified by

 
 
 
 

Malachite is a mineral of

 
 
 
 

Calamine is an ore of

 
 
 
 

Match the following

 
 
 
 

Match List-I with List-II and select the correct answer using the codes given below the Lists

 
 
 
 

Which of the following metals do not form amalgam ?

 
 
 
 

Most of the explosions in mines occur due to the mixing of

 
 
 
 

Which one of the following materials is very hard and very ductile ?

 
 
 
 

An aqueous solution of copper sulphate is acidic in nature because the salt undergoes

 
 
 
 

Consider the following statements

 
 
 
 

Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlight, electric shavers etc ?

 
 
 
 

Assertion (A) : Sodium metal is stored under kerosene.
Reason (R) : Metallic sodium melts when exposed to air.

 
 
 
 

Consider the following statements :

Coke is one of the materials of the charge added to blast furnace for the production of steel / iron . Its function is to

 
 
 
 

Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because

 
 
 
 

Match List-I with List-II an

 
 
 
 

Match List-I with List-II and select the correct answer using the codes given below the Lists

 
 
 
 

Aluminium surface are often ‘anodized’. This means the ‘deposition of a layer of

 
 
 
 

Which one of the following statement is NOT correct ?

 
 
 
 

Which one of the following statements is correct ?

 
 
 
 

Consider the following statements :
The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is