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- Question
Which molecule is used up in photosynthesis?
Options- A. Water
- B. Carbohydrates
- C. Oxgen
- D. Sugar
- Correct Answer
- Water
ExplanationThe first step in photosynthesis is to split the water molecule using sun light.
- 1. 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
- 2. Which metal is liquid at room temperature?
Options- A. Bromine
- B. Chlorine
- C. Mercury
- D. Cesium Discuss
- 3. The ore which is found in abundance in India is
Options- A. fluorspar
- B. magnetite
- C. monazite
- D. bauxite Discuss
- 4. Which element has the lowest ionization energy?
Options- A. He
- B. Ne
- C. Fr
- D. Rb Discuss
- 5. One turn of the citric acid cycle produces
Options- A. two molecules of carbon dioxide are released
- B. three molecules of NADH and one molecule of FADH2 are generated
- C. one molecule of ATP or GTP is produced
- D. All of the above Discuss
- 6. 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
- 7. Which of the following is not soluble in water?
Options- A. sodium chloride
- B. potassium sulfate
- C. copper(II) hydroxide
- D. silver nitrate Discuss
- 8. 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
- 9. Which of the following elements is used for vulcanizing rubber?
Options- A. Sulphur
- B. Chlorine
- C. Bromine
- D. Phosphorus Discuss
- 10. During which change is energy absorbed?
Options- A. Exothermic
- B. Endothermic
- C. Both A & B
- D. Neither A nor B Discuss
Chemistry problems
Search Results
Correct Answer: Oxygen and Acetylene
Explanation:
Oxygen and Acetylene are the gases used in different types of welding.
Correct Answer: Mercury
Explanation:
Mercury is the only metal that remains in liquid at room temperature.
Correct Answer: monazite
Explanation:
The ore which is found in abundance in India is monazite.
Correct Answer: Fr
Explanation:
Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms. Atoms are more stable when they have full valence shells.
The ionization energy decreases from top to bottom in groups, and increases from left to right across a period.
HGence, in this trend Francium (Fr) has the lowest ionization energy.
Correct Answer: All of the above
Explanation:
One turn of the citric acid cycle produces
1. Two molecules of carbon dioxide are released.
2. One molecule of ATP or GTP is produced.
3. Tree molecules of NADH and one molecule of FADH2 are generated.
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: 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: 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: Sulphur
Explanation:
Vulcanization 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.
Correct Answer: Endothermic
Explanation:
Endothermic reaction is the reaction in which energy is obserbed for the change.
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