Chemistry- Questions and Answers 24

466. ln Clark method, what is added to water to remove the temporary hardness?
Lime (Calcium hydroxide)

467. Which element is used for radiographic imaging?
Barium

468. Development of unpleasant smell & taste in oil & fat containing food items due to oxidation of atmospheric oxygen is called------?
Rancidity

469. Who discovered radio carbondating?
Willard Frank Libby

470. Which is the rarest gas in the atmosphere?
Radon

471. The geosynchronous satellites orbit------- km above the earth?
36,000 km

472. Which substance has the highest expansivity in normal temperature?
Caesium

473. What is known as 'Blue Gold'?
Water

474. Which organism can travel in accordance with the magnetic field of the earth?
Snail

475. Bessemer process is associated with the production of------?
Steel

476. Who invented revolver?
Samuel Colt

477. What is the unit of potential difference?
Volt

478. What is known as 'the Metal of the Future'?
Titanium

479. In the International System of Units, mole is the unit of------?
Amount of substance

480. Which chemical compound is the main constituent of the natural gas?
Methane

481. Which chemical has the nick-name of 'the Butter of Zinc'?
Zinc Chloride

482. Which chemical compound is also known in the names of 'Prussian blue, Parisian Blue & Berlin Blue'?
Ferric ferrocyanide

483. Which element is industrially produced through the Claus Process?
Sulfur

484. What is known as 'the Magic Metal of Life'?
Calcium

485. Which acid is usually stored in plastic containers due its high reactivity toward glass?
Hydrofluoric Acid

486. Which element forms the largest number of solid allotropes?
Sulfur

487. Which chemical is produced through the Raschig Process?
Hydroxylamine

488. Which chemical has the nickname of'the Salt of Hartshorn'?
Ammonium Carbonate

489. Exposure to which heavy metal causes Acrodynia or Pink disease in children?
Mercury

490. Which compound of mercury is also known as 'red mercury'?
Mercury iodide

491. What color phenolphthalein turns in the presence of bases?
Pink

492. What color is shown by a neutral solution in the universal indicator?
Green

493. Which chemical acts as the chief agent in attracting mosquitoes to humans?
Lactic Acid

494. What is the most commonly used de-icing chemical?
Sodium chloride (Table salt)

495. Which chemical is also known as 'hot ice'?
Sodium acetate
<Next Page><01,....... 22, 23, 24, 25, 26, 27, 28, 29>
General Science - Questions -> Click here
Physics - Questions -> Click here
Chemistry - Questions -> Click here
Biology - Questions -> Click here
Zoology - Questions -> Click here
Everyday Science - Questions -> Click here
General Science - Questions(Malayalam)- Click here
PSC TODAYS EXAM RESULTS ---> Click here
PSC EXAM PROGRAMME -> Click here
PSC Degree Level Questions & Answers - Click here
PSC LDC/LGS Questions & Answers - Click here
PSC RANK LISTS / SHORT LISTS -> Click here
PSC Solved Question Papers ---> Click here
PSC FREE MOCK TEST -> Click here
PSC/UPSC/SSC/RRB/DEVASWOM EXAM SYLLABUS
- Click here

Related Links

1. CURRENT AFFAIRS ---> Click here

2. GENERAL KNOWLEDGE QUESTIONS (English) ---> Click here
2. GENERAL KNOWLEDGE QUESTIONS (Malayalam) ---> Click here

3. IT, CYBER LAWS AND GENERAL ENGLISH ---> Click here

4. GENERAL SCIENCE - QUESTIONS AND ANSWERS

5. FACTS ABOUT INDIA

6. FACTS ABOUT KERALA

7. FACTS ABOUT WORLD

8. GEOGRAPHY AND ECONOMICS

9. FAMOUS PERSONALITIES - QUESTIONS & ANSWERS
10. MATHS/ARITHMETIC/MENTAL ABILITY---> Click here

11. PSC PREVIOUS / SOLVED QUESTION PAPERS ---> Click here

12. PSC QUESTIONS IN MALAYALAM