Chemistry 4

Chemistry (Civil Service Examination), Questions and Answers, GK for UPSC, Bank PO & All Exams

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1. The chemical used as a ‘fixer’in photography is [1995]

 
 
 
 

2. Match List I with List II and select the correct answer using the codes given below the lists: [1998]
List-1
A. Blue vitriol
B. Epsom salt
C. Baking soda
D. Caustic soda
List-II
1. Sodium bicarbonate
2. Sodium hydroxide
3. Magnesium sulphate
4. Copper sulphate
Codes:

 
 
 
 

3. The most reactive among the halogens is [1997]

 
 
 
 

4. Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance? [1996]

 
 
 
 

5. Assertion (A) : To dilute sulphuric acid, acid is added to water and not water to acid. [1999]
Reason (R): Specific heat of water is quite large.

 
 
 
 

6. Which one of the following is not an essential micronutrient for plants? [1996]

 
 
 
 

7. Consider the following statements: [1998]
Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to
1. act as the reducing agent
2. remove silica associated with the iron ore
3. function as fuel; to supply heat
4. act as an oxidizing agent Of these statements

 
 
 
 

8. Match List 1 with List II and select the correct answer using the codes given below the lists: [1998]
List-I – List-II
A. Potassium bromide – 1. Fertiliser
B. Potassium nitrate – 2. Photography
C. Potassium sulphate – 3. Bakery
D. Monopotassium tartarate – 4. Gun powder Codes:

 
 
 
 

9. Assertion (A): Sodium metal is stored under kerosene. Reason (R): Metallic sodium melts when exposed to air. [1998]

 
 
 
 

10. Which one of the following metals does not form amalgam? [1998]

 
 
 
 

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Isaac Newton

The Royal Society

In 1672, Newton became a member of the Royal Society a group of scientists committed to the experimental method. He presented one of his new telescopes to the Royal Society along with his findings on light. The Royal Society set up a committee led by physicist Robert Hooke to evaluate Newtons findings. Hooke was a scientist employed by the Royal Society to evaluate new inventions. However, Hooke had his own ideas on light and was slow to accept the truth of Newtons findings. This surprised and disappointed Newton, who even considered not circulating his discoveries in the future.While it is sometimes said that Newton was too sensitive to critical evaluation of his work, he was merely concerned that the time spent justifying past findings was preventing him from making new discoveries.