Discussion
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- Question
The commonly used coolant in refrigerators is
Options- A. Ammonia
- B. Nitrogen
- C. Freon
- D. Oxygen
- Correct Answer
- Freon
- 1. The depletion in Ozone layer is caused by ___________ .
Options- A. Nitrous oxide
- B. Carbon dioxide
- C. Chlorofluorocarbons
- D. Methane Discuss
- 2. What is dry ice?
Options- A. Solid Carbon dioxide
- B. Solid Nitrogen dioxide
- C. Solid Sulphur dioxide
- D. Solid Water Discuss
- 3. Which among the following metal is used for galvanization?
Options- A. Zinc
- B. Copper
- C. Iron
- D. Silver Discuss
- 4. Hydrogenation process is associated with which of the following?
Options- A. Rubber
- B. Petroleum
- C. Copper
- D. Edible fats Discuss
- 5. ........... compound is used as a drying agent.
Options- A. Calcium oxide
- B. Calcium carbide
- C. Gypsum
- D. Calcium carbonate Discuss
- 6. Which one of the following is an ohmic conductor?
Options- A. Germanium
- B. Silicon
- C. Carbon
- D. Silver Discuss
- 7. In which of the following MgCl2 is soluble?
Options- A. Petrol
- B. Acetone
- C. Kerosene
- D. Water Discuss
- 8. Potassium Permanganate is used for purifying drinking water, because________
Options- A. It is a reducing agent
- B. It is an oxidising agent
- C. It is a sterilising agent
- D. It dissolves the impurities of water Discuss
- 9. In paper manufacturing, degumming of the raw material is done using
Options- A. sulphuric acid
- B. bleaching powder
- C. caustic soda
- D. nitric acid Discuss
- 10. Which of the following elements has the lowest melting point?
Options- A. Chromium
- B. Hydrogen
- C. Zinc
- D. Silver Discuss
Chemistry problems
Search Results
Correct Answer: Chlorofluorocarbons
Correct Answer: Solid Carbon dioxide
Correct Answer: Zinc
Correct Answer: Edible fats
Correct Answer: Calcium oxide
Correct Answer: Silver
Correct Answer: Water
Correct Answer: It is an oxidising agent
Correct Answer: caustic soda
Explanation:
Paper production is basically a two-step process in which a fibrous raw material is first converted into pulp, and then the pulp is converted into paper. The harvestedwood is first processed so that the fibres are separated from the unusable fraction of the wood, the lignin. Pulp making can be done mechanically or chemically. In the chemical pulping process, alkali (e.g., sodium hydroxide in the form of a lye or caustic soda) is usually used to remove the lignin that binds the fibres. So, for degumming of raw material, caustic soda is used.
Correct Answer: Hydrogen
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