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- Question
Which of the following elements has the lowest melting point?
Options- A. Chromium
- B. Hydrogen
- C. Zinc
- D. Silver
- Correct Answer
- Hydrogen
- 1. 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
- 2. 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
- 3. In which of the following MgCl2 is soluble?
Options- A. Petrol
- B. Acetone
- C. Kerosene
- D. Water Discuss
- 4. Which one of the following is an ohmic conductor?
Options- A. Germanium
- B. Silicon
- C. Carbon
- D. Silver Discuss
- 5. The commonly used coolant in refrigerators is
Options- A. Ammonia
- B. Nitrogen
- C. Freon
- D. Oxygen Discuss
- 6. The process of depositing a layer of zinc on iron is called ___________
Options- A. Galvanisation
- B. Crystallisation
- C. Rusting
- D. Baking Discuss
- 7. Which of the following statement is CORRECT?
Options- A. Gold and Silver are not ductile.
- B. Phophorus and Nitrogen are ductile.
- C. Copper and Platinum are ductile.
- D. Sulphur and Phophorus are sonorous Discuss
- 8. The passage of an electric current through a conducting liquid causes ___________.
Options- A. Galvanisation
- B. Evaporation
- C. Physical Reaction
- D. Chemical Reaction Discuss
- 9. Which of the following elements has the lowest melting point?
Options- A. Titanium
- B. Sulphur
- C. Argon
- D. Zinc Discuss
- 10. Atomic number of which of the following elements is greater than that of Chlorine
Options- A. Potassium
- B. Sulphur
- C. Aluminium
- D. Phosphorus Discuss
Chemistry problems
Search Results
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: It is an oxidising agent
Correct Answer: Water
Correct Answer: Silver
Correct Answer: Freon
Correct Answer: Galvanisation
Correct Answer: Copper and Platinum are ductile.
Correct Answer: Chemical Reaction
Correct Answer: Argon
Correct Answer: Potassium
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