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- Question
Metals that are liquid at room temperature?
Options- A. Caesium
- B. Gallium
- C. Rubidium
- D. Mercury
- Correct Answer
- Mercury
ExplanationMercury 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.
- 1. 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
- 2. A yellow element that stinks when burned
Options- A. Bromine
- B. Sulphur
- C. Chlorine
- D. Fluorine Discuss
- 3. The complexity and variety of organic molecules is due to
Options- A. their interaction with water
- B. their tremendously large sizes
- C. the chemical versatility of carbon atoms
- D. the variety of rare elements in organic molecules Discuss
- 4. Which of the following is true about compounds?
Options- A. They are substances
- B. They have properties similar to those of their component elements
- C. They can be physically separated into their component elements
- D. They have compositions that vary Discuss
- 5. Order of basicity of amines Discuss
- 6. Which is the most malleable metal?
Options- A. Gold
- B. Silver
- C. Both A & B
- D. Bronze Discuss
- 7. 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
- 8. 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
- 9. The chemical makeup of a rock is
Options- A. Nutrients
- B. Minerals
- C. Metals
- D. Water Discuss
- 10. What is the general formula for a straight-chain alkane?
Options- A. C2nH2n+3.
- B. CnH2n+2
- C. CnH2n
- D. CnH3n+2. Discuss
Chemistry problems
Search Results
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: the chemical versatility of carbon atoms
Explanation:
The complexity and variety of organic molecules is due to the chemical versatility of carbon atoms.
Correct Answer: They are substances
Explanation:
Compounds are substances is true about them.
Correct Answer: The order of basicity for primary, secondary and tertiary amines are: Secondary > Primary > Tertiary > NH3 * Amines are basic in nature as they have lone pair of electrons on nitrogen Therefore, they have a strong tendency to donate this lone pair of electrons to electron acceptors * The stability of conjugate acids formed is dependent on the extent of H-bonding,and greater the number of H-atoms on N more stable is the conjugate acid * The conjugate acid of primary amine is the most stable with greater number (3) of H-bonds than > Secondary > tertiary But primary amines are less basic than secondary as the electron density on the N atom is less and lone pair of electrons are not readily available for protonation * The two opposing factors ie the stability of conjugate acids formed and ease of availability of electrons for Protonation, balance each other in case of secondary amines and it is most basic
Correct Answer: Gold
Explanation:
The most malleable metal is Gold.
Correct Answer: Tin and lead
Explanation:
The two elements that are used to make bronze are tin and lead.
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: Minerals
Explanation:
The chemical composition of a rock is mainly minerals.
Correct Answer: CnH2n+2
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