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- Question
The mass of a mole of NaCl is the
Options- A. 58.44 gm/mol
- B. 57.25 gm/mol
- C. 56.31 gm/mol
- D. 59.14 gm/mol
- Correct Answer
- 58.44 gm/mol
ExplanationTo get the mass of a mole of NaCl, we need to add the molar atomic weights of the individual elements i.e, Na and Cl
Atomic weights of Na = 22.99 gm/mol Cl = 35.45 gm/mol
Now, mass of a mole of NaCl = 22.99 + 35.45 = 58.44 gm/mol.
- 1. A by product of involuntary muscle contraction and relaxation is
Options- A. Oxygen
- B. Water
- C. Heat
- D. Nitrogen Discuss
- 2. Give a possible molecular formula for C3H5ClO?
Options- A. C6H10Cl2O2
- B. C6H10O2
- C. C6H10ClO2
- D. C6H12Cl2O2 Discuss
- 3. Which formula represents a molecular compound?
Options- A. Ar
- B. NaI
- C. N2O4
- D. All of the above Discuss
- 4. 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 Discuss
- 5. 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 Discuss
- 6. Compounds are formed as a result of chemica change.
Options- A. TRUE
- B. FALSE Discuss
- 7. Identify the metalloid in the following list?
Options- A. Silicon
- B. Sulphur
- C. Scandium
- D. All of the above Discuss
- 8. Is deposition endothermic or exothermic?
Options- A. Endothermic
- B. Exothermic
- C. Both A & B
- D. Can't be determined Discuss
- 9. Atoms have no electric charge because they
Options- A. have same number of electrons and neutrons
- B. have same number of electrons and protons
- C. have same number of protons and neutrons
- D. have same number of protons, electrons and neutrons Discuss
- 10. Oxidation number of S8 ?
Options- A. +1
- B. -2
- C. +2
- D. 0 Discuss
Chemistry problems
Search Results
Correct Answer: Heat
Correct Answer: C6H10Cl2O2
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.
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.
Correct Answer: new information about an atoms structure is discovered
Correct Answer: TRUE
Explanation:
TRUE, the compounds are formed as a result of chemical change.
Correct Answer: Silicon
Explanation:
A metalloid is an element with properties between metals and non metals or the mix of both.
The six metalloids are arsenic, silicon, germanium, boron, antimony and tellurium.
Hence, silicon is the only metalloid in the given list.
Correct Answer: Exothermic
Explanation:
In thermodynamics, deposition is a phase transition in which gases are directly transformed to solids without converting to liquids first.
For example, watervapour is directly changed to ice without first becoming to liquid water. In this process, heat is released making the process exothermic process.
Correct Answer: have same number of electrons and protons
Explanation:
Atoms are composed of three main particles called electrons, protons and neutrons. We know that, the electrons are negatively charged particles whereas protons are positively charged and neutrons have no charge.
Hence, as the number of electrons and protons are equal and they are oppositely charged, the atom will have no charge as their charges cancel each other.
Correct Answer: 0
Explanation:
is an elemental form of sufur. In elemental form it can't be reduced or oxidized. Hence, it oxidation number is zero and thus sulfur is zerovalent here.
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