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- Question
Which element has the lowest ionization energy?
Options- A. He
- B. Ne
- C. Fr
- D. Rb
- Correct Answer
- Fr
ExplanationIonisation 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.
- 1. 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
- 2. The phosphorus cycle differs from the biogeochemical cycles in that
Options- A. does not have atmospheric reservoir
- B. uses water more
- C. have atmospheric reservoir
- D. None of the above Discuss
- 3. Carbon, Diamond and Graphite are together called
Options- A. Isomers
- B. Isotopes
- C. Allotrope
- D. Isomorphs Discuss
- 4. In the thermite process, the reducing agent is
Options- A. Chlorine
- B. Aluminium
- C. Silicon
- D. Iron Discuss
- 5. What is the value of triple point (solid, liquid and gas) of Water?
Options- A. 273.16° C
- B. -273.16 K
- C. 273.16 K
- D. 0° C Discuss
- 6. The ore which is found in abundance in India is
Options- A. fluorspar
- B. magnetite
- C. monazite
- D. bauxite Discuss
- 7. Which metal is liquid at room temperature?
Options- A. Bromine
- B. Chlorine
- C. Mercury
- D. Cesium Discuss
- 8. 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
- 9. Which molecule is used up in photosynthesis?
Options- A. Water
- B. Carbohydrates
- C. Oxgen
- D. Sugar Discuss
- 10. 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
Chemistry problems
Search Results
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: does not have atmospheric reservoir
Explanation:
Unlike other gas cycles, the phosphorus cycle differs in having atmospheric reservoir. No other gases are involved in it.
Correct Answer: Allotrope
Correct Answer: Aluminium
Explanation:
In the thermite process, the reducing agent is Aluminium.
Correct Answer: 273.16 K
Explanation:
The temperature at which a substance can exist in equilibrium in the liquid, solid, and gaseous states. The triple point of pure water is at 0.01°C (273.16K, 32.01°F).
Correct Answer: monazite
Explanation:
The ore which is found in abundance in India is monazite.
Correct Answer: Mercury
Explanation:
Mercury is the only metal that remains in liquid at room temperature.
Correct Answer: Oxygen and Acetylene
Explanation:
Oxygen and Acetylene are the gases used in different types of welding.
Correct Answer: Water
Explanation:
The first step in photosynthesis is to split the water molecule using sun light.
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.
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