Discussion
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- Question
In nuclear reactor,Chain reaction is controlled by introducing
Options- A. cadmium rod
- B. iron rod
- C. platinum rod
- D. graphite rod
- Correct Answer
- cadmium rod
- 1. The hard Shell of an egg was dissolved in HCL. The egg was then placed in a concentration solution of NaCl. What will happens ______
Options- A. The egg will shrink
- B. The egg will swell
- C. The egg will become harder
- D. There will be hardly any visible change Discuss
- 2. Temporary hardness is due to the presence of
Options- A. Calcium carbonate
- B. calcium bicarbonate
- C. magnesium sulphate
- D. calcium sulphate Discuss
- 3. Ethanol is converted into ethoxy ethane,
Options- A. by heating excess of ethanol with conc. H2SO4 at 140°C
- B. by treating with conc. H2SO4 at room temperature
- C. by treating with conc. H2SO4 at 273 K
- D. by heating Ethanol with excess of conc. H2SO4 at 443 K Discuss
- 4. ATP stands for -
Options- A. Adenosine triphosphate
- B. Alanine triphosphate
- C. Adrenalin triphosphate
- D. Asparagine triphosphate Discuss
- 5. Natural Rubber is a Polymer of
Options- A. butadiene
- B. 2methyl-1,3butadiene
- C. ethylene
- D. isoprene Discuss
- 6. Which of the following processes is used to remove reducible oxides from the metal?
Options- A. liquation
- B. cupellation
- C. poling
- D. electro refining Discuss
- 7. Which of the following is a radioactive element
Options- A. Sulphur
- B. Polonium
- C. Tellurium
- D. Selenium Discuss
- 8. The credit for the discovery of transuranic element goes to
Options- A. Hahn
- B. Rutherford
- C. Seaborg
- D. Curie Discuss
- 9. An element which is preserved under water is
Options- A. sodium
- B. sulphur
- C. red phosphorus
- D. white phosphorus Discuss
- 10. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
Options- A. dehydration
- B. oxidation
- C. reduction
- D. dehydrogenation Discuss
Chemistry problems
Search Results
Correct Answer: The egg will shrink
Correct Answer: calcium bicarbonate
Explanation:
Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.
Correct Answer: by heating excess of ethanol with conc. H2SO4 at 140°C
Correct Answer: Adenosine triphosphate
Explanation:
Adenosine triphosphate (ATP) is a nucleotide which is also called as nucleoside triphosphate is a small molecule used in cells as a coenzyme. It is often referred to as the "molecular unit of currency" of intracellular energy transfer. ATP transports chemical energy within cells for metabolism. Most of the cellular functions need energy in order to be carried out such as synthesis of proteins, synthesis of membranes, movement of the cell, cellular division, transport of various solutes etc. The ATP is the molecule that carries energy to the place where the energy is needed. When ATP breaks into ADP (adenosine diphosphate) and Pi (phosphate), the breakdown of the last covalent link of phosphate liberates energy that is used in reactions where it is needed.
Correct Answer: isoprene
Correct Answer: poling
Correct Answer: Polonium
Correct Answer: Seaborg
Correct Answer: white phosphorus
Explanation:
White phosphorus undergoes spontaneous combustion when exposed to air. In order to prevent this spontaneous ignition, it is preserved under water.
Correct Answer: oxidation
Explanation:
Saw dust contains carbon which is oxidised to carbon dioxide by concentrated nitric acid;
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