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- Question
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)
- Correct Answer
- Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq)
ExplanationIn 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.
- 1. 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
- 2. Which is the most malleable metal?
Options- A. Gold
- B. Silver
- C. Both A & B
- D. Bronze Discuss
- 3. Metals that are liquid at room temperature?
Options- A. Caesium
- B. Gallium
- C. Rubidium
- D. Mercury Discuss
- 4. The atomic mass of an element depends upon the
Options- A. number of electrons
- B. number of protons
- C. number of neutrons
- D. All of the above Discuss
- 5. A yellow element that stinks when burned
Options- A. Bromine
- B. Sulphur
- C. Chlorine
- D. Fluorine Discuss
- 6. The chemical makeup of a rock is
Options- A. Nutrients
- B. Minerals
- C. Metals
- D. Water Discuss
- 7. What is the general formula for a straight-chain alkane?
Options- A. C2nH2n+3.
- B. CnH2n+2
- C. CnH2n
- D. CnH3n+2. Discuss
- 8. What relationship exists between an enzyme and a catalyst? Discuss
- 9. 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
- 10. In the thermite process, the reducing agent is
Options- A. Chlorine
- B. Aluminium
- C. Silicon
- D. Iron Discuss
Chemistry problems
Search Results
Correct Answer: Tin and lead
Explanation:
The two elements that are used to make bronze are tin and lead.
Correct Answer: Gold
Explanation:
The most malleable metal is Gold.
Correct Answer: Mercury
Explanation:
Mercury is the only metal that is in liqid form at room temperature. Caesium, Gallim and Rubidium are also metals that are in liquid form but at slightly high temperature than the room temperature.
Correct Answer: All of the above
Explanation:
The atomic mass of an element depends upon the number of protons, electrons and neutrons in the atoms which make the elements.
Correct Answer: Sulphur
Explanation:
A yellow element that stinks when burned is Sulphur.
Correct Answer: Minerals
Explanation:
The chemical composition of a rock is mainly minerals.
Correct Answer: CnH2n+2
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: 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: Aluminium
Explanation:
In the thermite process, the reducing agent is Aluminium.
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