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- Question
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
- Correct Answer
- 273.16 K
ExplanationThe 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).
- 1. What relationship exists between an enzyme and a catalyst? Discuss
- 2. What is the general formula for a straight-chain alkane?
Options- A. C2nH2n+3.
- B. CnH2n+2
- C. CnH2n
- D. CnH3n+2. Discuss
- 3. The chemical makeup of a rock is
Options- A. Nutrients
- B. Minerals
- C. Metals
- D. Water Discuss
- 4. Which reaction occurs spontaneously?
Options- A. Cl2(g) + 2NaF(aq)--> F2(g) + 2NaCl(aq)
- B. I2(s) + 2NaF(aq)--> F2(g) + 2NaI(aq)
- C. Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq)
- D. I2(s) + 2NaBr(aq)--> Br2(l) + 2NaI(aq) Discuss
- 5. What two elements are used to make bronze?
Options- A. Lead and copper
- B. copper and tin
- C. Tin and lead
- D. copper and iron Discuss
- 6. In the thermite process, the reducing agent is
Options- A. Chlorine
- B. Aluminium
- C. Silicon
- D. Iron Discuss
- 7. Carbon, Diamond and Graphite are together called
Options- A. Isomers
- B. Isotopes
- C. Allotrope
- D. Isomorphs Discuss
- 8. 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
- 9. 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
- 10. Which element has the lowest ionization energy?
Options- A. He
- B. Ne
- C. Fr
- D. Rb Discuss
Chemistry problems
Search Results
Correct Answer: An enzyme is a variety of catalyst and is the relation between tham A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction
Correct Answer: CnH2n+2
Correct Answer: Minerals
Explanation:
The chemical composition of a rock is mainly minerals.
Correct Answer: Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq)
Explanation:
In this chemical reaction chlorine change oxidation number from 0 to -1 (reduction) and bromine change oxidation number from -1 to 0 (oxidation).
Chlorine is stronger oxidation reagent than bromine.
In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessin(Ts).
They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.
Going down in the group, element are weaker oxidazing reagent and less reactive.
Correct Answer: Tin and lead
Explanation:
The two elements that are used to make bronze are tin and lead.
Correct Answer: Aluminium
Explanation:
In the thermite process, the reducing agent is Aluminium.
Correct Answer: Allotrope
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: 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: 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.
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