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- Question
A sample of matter must be copper if
Options- A. atoms in the sample react with oxygen
- B. the sample can conduct electricity
- C. each atom in the sample has 29 protons
- D. the sample melts at 1768k
- Correct Answer
- each atom in the sample has 29 protons
ExplanationA sample of matter must be copper if each atom in the sample has 29 protons.
- 1. Diamond is harder than Graphite because of
Options- A. tetrahedral structure of diamond
- B. difference of crystalline structures
- C. difference of layers of atoms
- D. hexagonal structure of graphite Discuss
- 2. Permanent hardness of water may be removed by the addition of
Options- A. Alum
- B. Lime
- C. Sodium Carbonate
- D. Potassium Permanganate Discuss
- 3. Non metal found in liquid state?
Options- A. Chlorine
- B. Bromine
- C. Fluorine
- D. Iodine Discuss
- 4. Shock resisting steels should have
Options- A. toughness
- B. low wear resistance
- C. low tensile strength
- D. low hardness Discuss
- 5. Kaolin is chemically classified as
Options- A. Argillaceous rock
- B. Silicious rock
- C. Metamorphic rock
- D. Calcareous rock Discuss
- 6. PCP is more commonly known as
Options- A. Acid
- B. Angel dust
- C. Ecstasy
- D. None of the above Discuss
- 7. German Silver contains
Options- A. 100% pure silver
- B. 10% silver
- C. 1% silver
- D. 0% silver Discuss
- 8. Which of these rules are applicable for naming covalent compounds?
Options- A. nonmetal name + nonmetal name + suffix ?ide
- B. nonmetal name + nonmetal name + suffix ?ite
- C. metal name + nonmetal name + suffix ?ide
- D. metal name + nonmetal name + suffix ?ite Discuss
- 9. The hazardous component in most antifreeze is
Options- A. Ethane alcohol
- B. Ethylene Glycol
- C. Ehtylene
- D. Ethene Discuss
- 10. Which among the following minerals is also known as Horn Silver?
Options- A. Silver Chroride
- B. Zinc Phosphate
- C. Silver Iodide
- D. Silver Sulphide Discuss
Chemistry problems
Search Results
Correct Answer: difference of crystalline structures
Correct Answer: Sodium Carbonate
Explanation:
Permanent hardness of water may be removed by the addition of Sodium Carbonate.
Correct Answer: Bromine
Explanation:
Bromine is the Non metal found in liquid state.
Correct Answer: toughness
Explanation:
Shock resisting steels should have toughness.
S-5 is a silico-manganese shock resisting steel that offers good ductility.
Correct Answer: Argillaceous rock
Explanation:
Kaolin is chemically classified as Argillaceous rock.
Correct Answer: Angel dust
Explanation:
Phencyclidine (PCP) is a drug used for its mind-altering effects. It is also known as Angel dust. As a recreational drug, it is typically smoked, but may be taken by mouth, snorted, or injected. It may also be mixed with cannabis or tobacco.
Causes and Effects ::
* PCP may cause hallucinations, distorted perceptions of sounds, and violent behavior.
* Its effects include seizures, coma, addiction, and an increased risk of suicide.
Correct Answer: 0% silver
Explanation:
German Silver is an alloy of copper, nickel and zinc. It is composed of 60% copper, 20% nickel and 20% zinc. Due to its white-silverish appearance it is named as german silver but it contains no silver in it.
Correct Answer: metal name + nonmetal name + suffix ?ide
Explanation:
Simple covalent compounds are generally named by using prefixes metal name + nonmetal name + suffix ?ide to indicate how many atoms of each element are shown in the formula. Also, the ending of the last (most negative) element is changed to -ide. The prefixes used are mono-, di-, tri-, tetra-, penta-, hexa-, and so forth.
Correct Answer: Ethylene Glycol
Explanation:
Ethylene Glycol is an antifreeze is an additive which lowers the freezing point of a water-based liquid and increases its boiling point.
Correct Answer: Silver Chroride
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