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- Question
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.
- Correct Answer
- The atom's radius decreases and the atom becomes a positive ion.
ExplanationWhen an atom loses an electron it becomes a positive ion by acquiring negatively charged. When it loses electron, the atom's radius also decreased.
- 1. 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
- 2. Reduction of oxygen which forms water occurs during
Options- A. Respiration
- B. Photosynthesis
- C. Both A & B
- D. Neither photosynthesis nor respiration Discuss
- 3. 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
- 4. 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
- 5. Isotopes are atoms of the same element that have different
Options- A. mass numbers
- B. atomic numbers
- C. protons
- D. All of the above Discuss
- 6. A simple rule concerning water and electrolyte regulation is
Options- A. water passively follows salt
- B. salt actively follows water
- C. water actively follows salt
- D. salt passively follows water Discuss
- 7. Glycolysis is the conversion of
Options- A. Glucose to pyruvate
- B. Glucose to proteins
- C. Pyruvate to glucose
- D. All of the above Discuss
- 8. A yellow element that stinks when burned
Options- A. Sulphur
- B. Chlorine
- C. Fluorine
- D. Bromine Discuss
- 9. Which equation represents a neutralization reaction?
Options- A. 2Al(OH)3(s) ---> Al2O3(s) + 3H2O(l)
- B. H2SO4(aq) + 2NaOH(aq) ---> Na2SO4(aq) + 2H2O(l)
- C. 2H2(g) + O2(g) ---> 2H2O(l)
- D. H2CO3(aq) ---> CO2(g) + H2O(l) Discuss
- 10. Which group 4A element has the highest ionization energy?
Options- A. Silicon
- B. Tin
- C. Lead
- D. Carbon Discuss
Chemistry problems
Search Results
Correct Answer: oxidation of cellulose
Correct Answer: Respiration
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: 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: 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.
Correct Answer: water passively follows salt
Explanation:
A simple rule concerning water and electrolyte regulation is water passively follows salt.
Correct Answer: Glucose to pyruvate
Explanation:
Glycolysis is the metabolic process of converting 1 molecule of glucose to 2 molecules of pyruvate through a series of 10 enzyme catalyzed reactions.
Correct Answer: Sulphur
Explanation:
Sulphur is an yellow element that stinks when burned.
Correct Answer: H2SO4(aq) + 2NaOH(aq) ---> Na2SO4(aq) + 2H2O(l)
Explanation:
Here in the option B) H2SO4 - Sulfuric acid is reacting with sodium hydroxide (NaOH), a base to produce a salt (Sodium Sulfate), and water (H2O). This is characteristic of of acid-base neutralization reactions.
Correct Answer: Carbon
Explanation:
As the ionization energies of the elements decreases down the group carbon has got the highest ionization energy in the group being at the top of the group.
Carbon is on the top of the group 4 among the given elements. Hence, Carbon has the highest ionization energy.
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