Chemistry problems
- 1. Which two atoms form an ionic bond? Also asked in: Analyst, Bank Clerk, Bank PO
Correct Answer: Ionic bonding is a type of chemical bond in which valence electrons are lost from one atom and gained by another This bond generates two oppositely charged ions In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion Example :: One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it The ions produced are oppositely charged and are attracted to one another due to electrostatic forces
- 2. Which statement about weak bonds is correct?
Options- A. Covalent bonds are weak bonds
- B. They are hard to break
- C. Weak bonds are transient and easily reversible.
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Weak bonds are transient and easily reversible.
Explanation:
In chemistry, Weak bonds are those forces of attraction that, do not take a large amount of energy to break.
For example, hydrogen bonds are broken by energies in the order of 4 - 5 kcal/mol.
Ionic bonds, hydrogen bonds and van der Waals interactions are considered weak bonds.
Weak bonds are transient and easily reversible.
- 3. Which statement about electrons and atomic orbitals is NOT true?
Options- A. An orbital can contain a minimum of two electrons
- B. An electron has the same amount of energy in all orbitals
- C. An atom?s lowest energy level has only two orbitals
- D. All of the above Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
Explanation:
Yes, all the given statements are NOT true about electrons and atomic orbitals.
True statements are ::
An orbital can contain a maximum of two electrons.
An atom?s lowest energy level has only one orbital.
An electron has different amount of energies in all orbitals.
- 4. Which half reaction correctly represents reduction?
Options- A. Fe2+ + e- ---> Fe3+
- B. Au3+ + 3e? ---> Au
- C. Ag ---> Ag+ + e-
- D. All of the above Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Au3+ + 3e? ---> Au
Explanation:
A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.
- 5. Anaerobic glycolysis occurs without
Options- A. water
- B. glucose
- C. oxygen
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: oxygen
Explanation:
Anaerobic glycolysis is the transformation of glucose to lactate when limited amounts of oxygen (O2) are available.
Hence, Anaerobic glycolysis occurs without oxygen.
- 6. What is the main ingredient in face powder?
Options- A. Calcium carbonate
- B. Talc
- C. Magnesium carbonate
- D. China clay Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Talc
Explanation:
Talc or talcum is a clay mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 is the main ingredient in face powders that absorbs moisture and oil.
It is also called as French Chalk. Other ingredients include Calcium carbonate (chalk), Magnesium carbonate, China clay, starches like rice and potato, zinc oxide,...
- 7. The current atomic model would be revised if
Options- A. better microscopes are invented in the future
- B. a new element is discovered in the future
- C. better microscopes were being used to study its structure
- D. new information about an atoms structure is discovered Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: new information about an atoms structure is discovered
- 8. All atoms of the same element have the same
Options- A. number of protons
- B. number of electrons
- C. atomic number
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
Explanation:
All atoms of an element have the same number of protons. The number of protons in an element is a primary identifier known as its atomic number. The number of electrons is the same as the number of protons.
- 9. Which formula represents a molecular compound?
Options- A. Ar
- B. NaI
- C. N2O4
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: N2O4
Explanation:
Molecular compounds are those with covalent bonds between the elements and those elements are typically non metals.
Here in the given options, Ar is an element. NaI has an ionic bond. Hence, N2O4 has a covalent bond between the two non metals and is a molecular compound.
- 10. Give a possible molecular formula for C3H5ClO?
Options- A. C6H10Cl2O2
- B. C6H10O2
- C. C6H10ClO2
- D. C6H12Cl2O2 Also asked in: GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk, Analyst
Correct Answer: C6H10Cl2O2
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