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- Question
Which of the following is essential for the synthesis of thyroxin?
Options- A. Potassium
- B. Calcium
- C. Iodine
- D. Sodium
- Correct Answer
- Iodine
- 1. The polar ice-caps are made of ____________ water
Options- A. Saline
- B. Salt
- C. Sour
- D. Fresh Discuss
- 2. Atomic bomb is based on which of the following principle?
Options- A. Nuclear fusion
- B. Nuclear fission
- C. Natural radioactivity
- D. All options are correct Discuss
- 3. Which among the following minerals is also known as Horn Silver?
Options- A. Silver Chroride
- B. Zinc Phosphate
- C. Silver Iodide
- D. Silver Sulphide Discuss
- 4. The hazardous component in most antifreeze is
Options- A. Ethane alcohol
- B. Ethylene Glycol
- C. Ehtylene
- D. Ethene Discuss
- 5. Which of these rules are applicable for naming covalent compounds?
Options- A. nonmetal name + nonmetal name + suffix ?ide
- B. nonmetal name + nonmetal name + suffix ?ite
- C. metal name + nonmetal name + suffix ?ide
- D. metal name + nonmetal name + suffix ?ite Discuss
- 6. The main cause of rancidity in foods is the ____ of fats and oils.
Options- A. hydrolysis
- B. clarification
- C. reduction
- D. oxidation Discuss
- 7. If the atomic number of Krypton is 36, then its electronic configuration is:
Options- A. 2,8,18,8
- B. 2,8,20,6
- C. 2,18,16
- D. 2,18,8,8 Discuss
- 8. Chlorine gas is used in the manufacture of:
Options- A. Baking powder
- B. Bleaching powder
- C. Baking soda
- D. Washing soda Discuss
- 9. Who among the following laid the foundation of chemical sciences by establishing two important laws of chemical combination?
Options- A. Joseph L. Proust
- B. Antoine L. Lavoisier
- C. Ernest Rutherford
- D. Democritus Discuss
- 10. Elements A, B and C occur as Dobereiners triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?
Options- A. 20
- B. 40
- C. 23
- D. 12 Discuss
Chemistry problems
Search Results
Correct Answer: Fresh
Correct Answer: Nuclear fission
Correct Answer: Silver Chroride
Correct Answer: Ethylene Glycol
Explanation:
Ethylene Glycol is an antifreeze is an additive which lowers the freezing point of a water-based liquid and increases its boiling point.
Correct Answer: metal name + nonmetal name + suffix ?ide
Explanation:
Simple covalent compounds are generally named by using prefixes metal name + nonmetal name + suffix ?ide to indicate how many atoms of each element are shown in the formula. Also, the ending of the last (most negative) element is changed to -ide. The prefixes used are mono-, di-, tri-, tetra-, penta-, hexa-, and so forth.
Correct Answer: oxidation
Correct Answer: 2,8,18,8
Correct Answer: Bleaching powder
Correct Answer: Antoine L. Lavoisier
Correct Answer: 20
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