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- Question
Isotopes are atoms of the same element that have different
Options- A. mass numbers
- B. atomic numbers
- C. protons
- D. All of the above
- Correct Answer
- mass numbers
ExplanationIsotopes 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.
- 1. 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 Discuss
- 2. Laterite is chemically classified as
Options- A. argillaceous rock
- B. metamorphic rock
- C. caleareous rock
- D. sillcious rock Discuss
- 3. Which non metal is liquid at room temperature?
Options- A. Mercury
- B. Caesium
- C. Bromine
- D. Rubidium Discuss
- 4. Which of the following is not a strong acid?
Options- A. H2SO4
- B. CH3COOH
- C. HCl
- D. HBr Discuss
- 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 Discuss
- 6. Which of the following equals one atomic mass unit?
Options- A. one-twelfth the mass of one carbon-12 atom
- B. the mass of one electron
- C. one-sixth the mass of one helium-4 atom
- D. the mass of one carbon-12 atom Discuss
- 7. What is the purpose of balancing chemical equations?
Options- A. law of conservation of energy
- B. law of conservation of mass
- C. Both A & B
- D. None of the above Discuss
- 8. Reduction of oxygen which forms water occurs during
Options- A. Respiration
- B. Photosynthesis
- C. Both A & B
- D. Neither photosynthesis nor respiration Discuss
- 9. Browning of paper in old books is caused by
Options- A. oxidation of cellulose
- B. collection of dust
- C. frequent use
- D. lack of aeration Discuss
- 10. What occurs when an atom loses an electron?
Options- A. The atom's radius decreases and the atom becomes a positive ion.
- B. The atom's radius increases and the atom becomes a negative ion.
- C. The atom's radius decreases and the atom becomes a negative ion.
- D. The atom's radius increases and the atom becomes a positive ion. Discuss
Chemistry problems
Search Results
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.
Correct Answer: argillaceous rock
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.
Correct Answer: CH3COOH
Explanation:
CH3COOH, chemically known as Acetic acid, is not a strong acid among the given acids like Sulphuric acid, Hydrochloric acid,...
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.
Correct Answer: one-twelfth the mass of one carbon-12 atom
Explanation:
One atomic mass unit (AMU) is equal to the one-twelfth the mass of one carbon-12 atom.
Correct Answer: law of conservation of mass
Explanation:
The main purpose of balancing chemical equations is to make the mass of reactants is equal to mass of products obtained after the reaction. Hence, to make law of conservation of mass is purpose of balancing chemica equations.
Correct Answer: Respiration
Correct Answer: oxidation of cellulose
Correct Answer: The atom's radius decreases and the atom becomes a positive ion.
Explanation:
When an atom loses an electron it becomes a positive ion by acquiring negatively charged. When it loses electron, the atom's radius also decreased.
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