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- Question
Which of the following elements is used for vulcanizing rubber?
Options- A. Sulphur
- B. Chlorine
- C. Bromine
- D. Phosphorus
- Correct Answer
- Sulphur
ExplanationVulcanization of rubber is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulfur rubber much stronger, more flexible, and more resistant to heat and other environmental conditions.
- 1. Which of the following has the highest boiling point?
Options- A. 2,3-dimethylbutane
- B. 2-methylpentane
- C. 2,2-dimethylbutane
- D. 1,2-methylpentane Discuss
- 2. Which of the following is not soluble in water?
Options- A. sodium chloride
- B. potassium sulfate
- C. copper(II) hydroxide
- D. silver nitrate Discuss
- 3. Which one of the following is not true for minerals?
Options- A. they can be a liquid, solid, or glass
- B. they can be identified by characteristic physical properties
- C. they have a specific, internal, crystalline structure
- D. they have a specific, predictable chemical composition Discuss
- 4. Which molecule is used up in photosynthesis?
Options- A. Water
- B. Carbohydrates
- C. Oxgen
- D. Sugar Discuss
- 5. The gases used in different types of welding would include
Options- A. Acetylene
- B. Oxygen
- C. Oxygen and Acetylene
- D. Nitrogen, Oxygen and Acetylene Discuss
- 6. During which change is energy absorbed?
Options- A. Exothermic
- B. Endothermic
- C. Both A & B
- D. Neither A nor B Discuss
- 7. Which ionization process requires the most energy?
Options- A. C3+ (g) ? C4+ (g) + e-
- B. C (g) ? C+ (g) + e-
- C. C2+ (g) ? C3+ (g) + e-
- D. C+ (g) ? C2+ (g) + e- Discuss
- 8. In a concentrated solution there is
Options- A. no solute
- B. a large amount of solvent
- C. no solvent
- D. a large amount of solute Discuss
- 9. What determines the mass number of an element?
Options- A. Number of protons
- B. Number of electrons and protons
- C. Number of protons and neutrons
- D. Number of neitrons Discuss
- 10. The principal quantum number indicates what property of an electron?
Options- A. energy of electron
- B. distance of electron from nucleus
- C. both a & b
- D. number of subshells Discuss
Chemistry problems
Search Results
Correct Answer: 2,2-dimethylbutane
Explanation:
Due to the molecules present in the 2,2-dimethylbutane are closely packed, it has the highest boiling point.
Correct Answer: potassium sulfate
Explanation:
We know that,
All nitrates are soluble in water.
All chlorides are soluble in water with the exception of those formed with silver , lead , mercury ions as all halides are soluble.
Sulphates are soluble in water.
Hydroxides are not soluble in water.
Hence, copper(II) hydroxide is not soluble in water.
Correct Answer: they can be a liquid, solid, or glass
Explanation:
A mineral is a naturally occurring, inorganic solid, with a definite chemical composition. They cannot be in liquid or gas state. They exists only in solid state.
Correct Answer: Water
Explanation:
The first step in photosynthesis is to split the water molecule using sun light.
Correct Answer: Oxygen and Acetylene
Explanation:
Oxygen and Acetylene are the gases used in different types of welding.
Correct Answer: Endothermic
Explanation:
Endothermic reaction is the reaction in which energy is obserbed for the change.
Correct Answer: C3+ (g) ? C4+ (g) + e-
Explanation:
We know that each successive IE is greater than the previous one, because each ionization process removes one electron and hence increases the total attractive force on the remaining electrons from the nucleus. Hence, C3+ (g) ? C4+ (g) + e- needs more energy.
Correct Answer: a large amount of solute
Explanation:
In a concentrated solution there is a large amount of solute.
Correct Answer: Number of protons and neutrons
Explanation:
The number of protons in an isotope or an atom gives its atomic number whereas the number of protons and neutrons gives its mass number.
Correct Answer: both a & b
Explanation:
The principal quantum number is the property of an electron which determines the energy of electron and the distance of electron from the nucleus of an atom.
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