Chemistry problems
- 1. Which is the best definition of activation energy?
Options- A. the energy required to break the bonds of reactant molecules
- B. the energy required to end a chemical reaction
- C. the energy required to bind a substrate to an active site
- D. the energy required to re-form bonds in product molecules Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: the energy required to break the bonds of reactant molecules
Explanation:
Activation energy is a minimum amount of energy that required for the chemical reaction to happen or to take place.
- 2. Which of the following reactions are redox reactions?
Options- A. Ba(s)+Cl2(g)--->BaCl2(s)
- B. Mg(s)+Br2(l)--->MgBr2(s)
- C. Al(s)+3Ag^+(aq)--->Al^3+(aq)+3Ag(s)
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
- 3. A solution that is hypotonic to a cell has
Options- A. more water molecules surrounding the cell than inside the cell
- B. more water molecules inside the cell than outside the cell
- C. equal water molecules inside and outside the cell
- D. None of the above Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: more water molecules surrounding the cell than inside the cell
- 4. Liquid sodium is being considered as
Options- A. engine coolant
- B. bleaching agent
- C. antiseptic
- D. None of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: engine coolant
Explanation:
Liquid sodium is being considered as engine coolant.
- 5. Conductivity in a metal results from the metal atoms having
Options- A. highly mobile electrons in the valence shell
- B. high electronegativity
- C. high ionization energy
- D. highly mobile protons in the nucleus Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: highly mobile electrons in the valence shell
Explanation:
The outer most electrons that are free to move are called valency electrons that are responsible for the conductivity in the metal atoms.
- 6. Which of the following is not a strong acid?
Options- A. H2SO4
- B. CH3COOH
- C. HCl
- D. HBr Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: CH3COOH
Explanation:
CH3COOH, chemically known as Acetic acid, is not a strong acid among the given acids like Sulphuric acid, Hydrochloric acid,...
- 7. Which non metal is liquid at room temperature?
Options- A. Mercury
- B. Caesium
- C. Bromine
- D. Rubidium Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Bromine
Explanation:
Mercury and Bromine both will be in liquid state at room temperature. But mercury is metal. Hence, bromine is the only non metal which is in liquid state at room temperature.
- 8. Laterite is chemically classified as
Options- A. argillaceous rock
- B. metamorphic rock
- C. caleareous rock
- D. sillcious rock Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: argillaceous rock
- 9. Which best describes the nucleus of an atom?
Options- A. It is the densest part of the atom
- B. It has neutrons
- C. It has protons
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
Explanation:
The nucleus of an atom is the densest part of an atom. It contains the protons and neutrons of an atom.
- 10. Isotopes are atoms of the same element that have different
Options- A. mass numbers
- B. atomic numbers
- C. protons
- D. All of the above Also asked in: Bank Clerk, Bank PO, AIEEE, Bank Exams, CAT, GATE, Analyst
Correct Answer: mass numbers
Explanation:
Isotopes are atoms of the same element that have different mass numbers.
Example : Hydrogen, Deutirium and tritium all these have different mass but same atomic numbers.
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