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- Question
Permanent hardness of water may be removed by the addition of
Options- A. Alum
- B. Lime
- C. Sodium Carbonate
- D. Potassium Permanganate
- Correct Answer
- Sodium Carbonate
ExplanationPermanent hardness of water may be removed by the addition of Sodium Carbonate.
- 1. Non metal found in liquid state?
Options- A. Chlorine
- B. Bromine
- C. Fluorine
- D. Iodine Discuss
- 2. Shock resisting steels should have
Options- A. toughness
- B. low wear resistance
- C. low tensile strength
- D. low hardness Discuss
- 3. Kaolin is chemically classified as
Options- A. Argillaceous rock
- B. Silicious rock
- C. Metamorphic rock
- D. Calcareous rock Discuss
- 4. Ammonia can be dried by
Options- A. Sulphuric acid
- B. Calcium oxide
- C. Phosphorus pentoxide
- D. Calcium Chloride Discuss
- 5. Which properties are characteristic of the group 1 metals?
Options- A. Low melting points
- B. Produce hydrogen when react with water
- C. Soft in nature
- D. All of the above Discuss
- 6. 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
- 7. 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 Discuss
- 8. PCP is more commonly known as
Options- A. Acid
- B. Angel dust
- C. Ecstasy
- D. None of the above Discuss
- 9. German Silver contains
Options- A. 100% pure silver
- B. 10% silver
- C. 1% silver
- D. 0% silver Discuss
- 10. 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
Chemistry problems
Search Results
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: Calcium Chloride
Explanation:
Ammonia can be dried by Calcium Chloride or calcium hydroxide.
Correct Answer: All of the above
Explanation:
Group 1 metals are also called as alkali metals with reactive in nature and low melting points. They are soft and produce hydrogen and alkaline metal hydroxide solution when they react with water.
Correct Answer: difference of crystalline structures
Correct Answer: each atom in the sample has 29 protons
Explanation:
A sample of matter must be copper if each atom in the sample has 29 protons.
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.
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