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- Question
The main element used in the vulcanisation of rubber is
Options- A. nickel
- B. copper
- C. sulphur
- D. graphite
- Correct Answer
- sulphur
ExplanationIn vulcanization, cruder rubber is heated with 3% sulphur at about for for 2-3 hours.
Vulcanised rubber is a vastly improved product.
- 1. 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
- 2. Number of moles of CO2 present in 24 grams of carbon is
Options- A. 0.5
- B. 1
- C. 2
- D. 0.25 Discuss
- 3. 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
- 4. 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
- 5. An alloy is
Options- A. a compound
- B. an allotropic form
- C. an isomer
- D. a mixture Discuss
- 6. A particle which is similar to electron is
Options- A. positron
- B. beta particle
- C. photon
- D. mason Discuss
- 7. 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
- 8. The freezing point of water at 760mm pressure is
Options- A. 0 K
- B. 273 K
- C. 273 C
- D. -273 C Discuss
- 9. 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
- 10. What is the simplest form of matter?
Options- A. Element
- B. Molecule
- C. Atom
- D. Compound Discuss
Chemistry problems
Search Results
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: sum of neutrons and electrons
Explanation:
Atomic weight=number of neutrons+number of protons
Correct Answer: an alpha particle
Correct Answer: a mixture
Correct Answer: beta particle
Correct Answer: Scintillation counter
Correct Answer: 273 K
Explanation:
K 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
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.
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