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- Question
Which of the following metal is generally used for making filaments of bulb?
Options- A. W
- B. Ag
- C. Fe
- D. Rh
- Correct Answer
- W
ExplanationW is the symbol for chemical element Tungsten or Wolfram.
It is used in making filaments of bulbs.
- 1. What are long chains of Carbon Molecules called
Options- A. Ribosomes
- B. Hydrocarbons
- C. Polymers
- D. None Discuss
- 2. What is the IUPAC name for the following compound? H3C-C?C-H
Options- A. Acetylene
- B. Methyl acetylene
- C. Butanol
- D. Decanoic Acid Discuss
- 3. Tetraethyl lead is used as
Options- A. Fire extinguisher
- B. Gasoline additive
- C. Mosquito repellent
- D. Pain killer Discuss
- 4. Is Osmosis Active or Passive? Discuss
- 5. Ozone hole refers to
Options- A. Decrease in the thickness of ozone layer in Stratosphere
- B. Increase in thickness of ozone layer
- C. Decrease in the ozone layer in Troposphere
- D. Hole in the ozone layer Discuss
- 6. Triple point of water corresponds to
Options- A. 1 atm, 0°C
- B. 1 atm, 0.01°C
- C. 1 atm, 0 K
- D. 4.58 Torr, 0.01°C Discuss
- 7. Which of the following is NOT a primary green house gas in the earth's atmosphere?
Options- A. Methane
- B. Ozone
- C. Nitrous oxide
- D. Hydrogen Discuss
- 8. An alloy is
Options- A. a compound
- B. an allotropic form
- C. an isomer
- D. a mixture Discuss
- 9. A particle which is four times in mass and two times in charge that of proton is
Options- A. helium atom
- B. an alpha particle
- C. deuteron
- D. tritium Discuss
- 10. Atomic weight of an element is given by
Options- A. sum of neutrons and electrons
- B. sum of neutrons and protons
- C. only neutrons
- D. only protons Discuss
Chemistry problems
Search Results
Correct Answer: Polymers
Explanation:
A small organic molecule (sugars or amino acids), several of which may be bonded together to form a chain called a polymer.
Correct Answer: Methyl acetylene
Explanation:
The IUPAC name of the compound is Methyl Acetylene or Propyne.
Correct Answer: Gasoline additive
Explanation:
Tetraethyl lead is a highly toxic compound used as a gasoline additive.
Tetraethyl lead abbreviated as TEL, is an organo lead compound with the formula (CH3CH2)4Pb. It is a petro-fuel additive which in turn caused increased vehicle performance. This is also used as an antiknock agent in gasoline and jet fuels. Tetraethyl lead is absorbed rapidly by the skin, the lungs, and the gastrointestinal tract. It is converted to triethyl lead, which might be responsible for its toxicity.
Correct Answer: Osmosis is the process in which water molecules move from a region of higher water potential to a region of lower potential down a water potential gradient across a partially permeable membrane It doen't requires any additional energy to do this work So, Osmosis is a Passive Active and passive transport processes are two ways molecules and other materials move in and out of cells and cross intracellular membranes 1 Active transport is the movement of molecules or ions against a concentration gradient (from an area of lower to higher concentration), which does not ordinarily occur, so enzymes and energy are required 2 Passive transport is the movement of molecules or ions from an area of higher to lower concentration Passive transport occurs because of the entropy of the system, so additional energy isn't required for it to occur 3 Active transport requires energy to proceed, while passive transport does not require the input of extra energy to occur
Correct Answer: Decrease in the thickness of ozone layer in Stratosphere
Correct Answer: 4.58 Torr, 0.01°C
Correct Answer: Hydrogen
Correct Answer: a mixture
Correct Answer: an alpha particle
Correct Answer: sum of neutrons and electrons
Explanation:
Atomic weight=number of neutrons+number of protons
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