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- Question
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
- Correct Answer
- They are substances
ExplanationCompounds are substances is true about them.
- 1. Order of basicity of amines Discuss
- 2. What types of orbital overlap occur in Cumulene? Discuss
- 3. Hydrophilic molecules readily associate with
Options- A. water
- B. alcohols
- C. both A & B
- D. none of the above Discuss
- 4. Which molecule contains a nonpolar covalent bond?
Options- A. Cl2
- B. Br2
- C. H2
- D. All of the above Discuss
- 5. Hydrogen bonds and hydrophilic interactions are
Options- A. Strong chemical bonds that hold together the atoms within a molecule
- B. Weak chemical bonds that hold together the atoms within a molecule
- C. Strong chemical bonds that link together separate molecules
- D. Weak chemical bonds that link together separate molecules Discuss
- 6. 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
- 7. A yellow element that stinks when burned
Options- A. Bromine
- B. Sulphur
- C. Chlorine
- D. Fluorine Discuss
- 8. 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
- 9. Metals that are liquid at room temperature?
Options- A. Caesium
- B. Gallium
- C. Rubidium
- D. Mercury Discuss
- 10. Which is the most malleable metal?
Options- A. Gold
- B. Silver
- C. Both A & B
- D. Bronze Discuss
Chemistry problems
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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: A cumulene is a hydrocarbon with three or more cumulative double bonds They are analogous to allenes, only having a more extensive chain The simplest molecule in this class is butatriene, which is also called simply cumulene The carbons on the ends are sp² hybridized, with a p-orbital for the 'second' bond in the double bond with their neighboring carbons They have those sp² orbitals overlapping with the s from the hydrogen, and they have a p overlapping in the pi bond with the neighboring carbon They also have a sigma bond with the neighboring carbon I'll get to The middle carbons each have two pi bonds with their neighbors, leaving sp hybridiaztion for the rest So they have sp/sp² with the end carbons, and sp/sp with each other (And they also have p/p in the pi bonds) All orbital overlappings in Cumuene are : * s/sp² * p/p * sp/sp² * sp/sp
Correct Answer: both A & B
Explanation:
Hydrophilic molecules readily associate with water molecules and water like molecules such as alcohols.
Correct Answer: All of the above
Explanation:
In all the given options, molecules are containing nonpolar covalent bonds.
Correct Answer: Weak chemical bonds that link together separate molecules
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: Sulphur
Explanation:
A yellow element that stinks when burned is Sulphur.
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: 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: Gold
Explanation:
The most malleable metal is Gold.
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