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- Question
The freezing point of water at 760mm pressure is
Options- A. 0 K
- B. 273 K
- C. 273 C
- D. -273 C
- Correct Answer
- 273 K
ExplanationK is degree kelvin
Zero K corresponds to -273 K = C + 273
The freezing point of water being 0 C, on the kelvin scale it is 0 C + 273 K
- 1. Which one of the following can be used to confirm wether drinking water contains a gamma emitting isotope or not
Options- A. Microscope
- B. Scintillation counter
- C. Lead plate
- D. pectrophotometer Discuss
- 2. A particle which is similar to electron is
Options- A. positron
- B. beta particle
- C. photon
- D. mason Discuss
- 3. The main element used in the vulcanisation of rubber is
Options- A. nickel
- B. copper
- C. sulphur
- D. graphite Discuss
- 4. Chloroform used as anaesthetic should be preserved in the dark in tightly stoppered bottles because otherwise
Options- A. it becomes coloured
- B. it gets evaporated in air
- C. it gets oxidised to phosgene
- D. it gets decomposed to chloropicrin Discuss
- 5. Number of moles of CO2 present in 24 grams of carbon is
Options- A. 0.5
- B. 1
- C. 2
- D. 0.25 Discuss
- 6. What happens when two atoms form a chemical bond?
Options- A. Two atoms fuse together to form a chemical bond
- B. The atoms share or transfer electrons
- C. A chemical bond forms when two atoms transfer or share protons to achieve a stable nucleus
- D. Like charges in the atoms cause them to stick together Discuss
- 7. What is the simplest form of matter?
Options- A. Element
- B. Molecule
- C. Atom
- D. Compound Discuss
- 8. Which acid is produced when milk gets sour?
Options- A. Lactic acid
- B. Acetic acid
- C. Tartaric acid
- D. Butyric acid Discuss
- 9. The maximum number of hydrogen bonds in a water molecule is...........
Options- A. 1
- B. 3
- C. 4
- D. 2 Discuss
- 10. Acid Precipitation is caused by a mix of
Options- A. Hydrogen, Oxygen, and Saline
- B. Water, Soil, and Air
- C. Respiration, Carbonic Acids, and Seawater
- D. Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides Discuss
Chemistry problems
Search Results
Correct Answer: Scintillation counter
Correct Answer: beta particle
Correct Answer: sulphur
Explanation:
In vulcanization, cruder rubber is heated with 3% sulphur at about for for 2-3 hours.
Vulcanised rubber is a vastly improved product.
Correct Answer: it gets oxidised to phosgene
Explanation:
Chloroform, is easily oxidised to the highly poisonous gas known as phosgene or carbonyl chloride COCl2. Hence if it is used as anaesthetic it should be kept free from sunlight and air.
Correct Answer: 2
Explanation:
1 mole of CO2 contain 12gms of carbon and 44 gms of CO2
therefore 24 gms of carbon is present in 88 gms of CO2 or 2 moles of CO2
Correct Answer: The atoms share or transfer electrons
Explanation:
All chemistry is based on sharing electrons. A chemical bond forms when two atoms transfer or share outer electrons to complete their outer shells.
Correct Answer: Element
Explanation:
The simplest form of matter that has a unique set of properties and is cannot be broken down into simpler substances by chemical means is called an Element.
An Atom is the simplest form of an element.
The simplest form of some elements is a Molecule. When an element consists of two identical atoms it is called a diatomic molecule.
A substance that contains two or more elements chemically combined in a fixed proportion is called a Compound.
Correct Answer: Lactic acid
Correct Answer: 4
Correct Answer: Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides
Explanation:
Acid Precipitation or Acid rain is caused by a mix of Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides.
A Chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as Acid Rains.
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